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Investigation on Corrosion Behaviour of Metallic Materials
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Investigation on Corrosion Behaviour of Metallic Materials

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Corrosion, Wear and Erosion".

Deadline for manuscript submissions: closed (10 July 2024) | Viewed by 21253

Special Issue Editors

Dr. Biserka Runje

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia
Interests: stainless steels; coatings; design consideration
Dr. Marin Kurtela

E-Mail Website
Assistant Guest Editor
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia
Interests: aluminium alloys; corrosion inhibitors; stainless steels; coatings
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Historically speaking, the intensive development and the aspiration of humanity to convert available natural resources into various products and thus meet the needs of modern humankind causes a daily growing range of pressures on all aspects of the environment and thus suppresses ecological awareness as part of social awareness determined by the historical state and degree of social development. The task of every modern society is therefore the introduction of ecological criteria and standards in all spheres of life and their support, especially in the areas of production, transport, culture and politics, in order to protect human health and life on Earth. A significant part of environmental problems can be solved by improving existing or applying modern harmless technologies, while the other part must be solved by changes in menkind's understanding and understanding of the possibilities and needs of living, thus creating a foundation for a reasonable, responsible, sustainable and harmonious relationship between man and the environment. The importance of the application of modern scientific knowledge about materials and their protection technology is represented by an unavoidable set of procedures and methods necessary to achieve a sophisticated way of designing, exploitation and maintenance, while at the same time, generating, understanding and structuring them directs production towards more environmentally friendly production processes and protection systems of materials, and ensures that the exploited material is reused after the recycling process.

Since nowadays corrosion destruction of metallic materials is one of the key factors in economic, safety and environmental issues, which has significantly increased interest in this topic, modern solutions of corrosion reduction should be based on the application of highly effective and environmentally friendly solutions, such as green corrosion inhibitors. Their extreme effectiveness and multifunctionality, in addition to individual application, is a fundamental determinant of other surface protection systems, such as conventional and self-healing coatings, so it is not surprising that the great interest of academic and industrial communities encourages a great amount of scientific research in order to find an inhibitor with a wide application area, which at the same time affects the self-sustainability of protective surface systems. Since such sustainable innovations can generally be broadly ranked from incremental to transformative, with each category having its own typical improvement potential, timescale, technological and operational challenges, global research activities are largely focused on the intensive improvement of such modern systems.

The potential topics are:

  • Commercial application of "Rare-Earth" elements as a promising and environmentally friendly representative of next-generation corrosion inhibitors
  • Influence of exploitation parameters on the corrosion resistance of aluminum alloys in aviation
  • Modification of the surface layers of metal materials by the process of heat treatment in order to achieve greater hardness and corrosion resistance of metallic substrates.
  • Recent developments of protection of metal materials obtained by wire and electric arc additive manufacturing (WAAM)
  • Encapsulation and integration of lanthanide compounds in a porous anodized passive film.

We look forward to receiving your contributions.

Dr. Biserka Runje
Guest Editor

Dr. Marin Kurtela
Assistant Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • green corrosion inhibitors
  • corrosion resistance
  • wire and electric arc additive manufacturing
  • surface modification of metals
  • multifunctional anodized coatings

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Published Papers (12 papers)

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Research

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19 pages, 4858 KiB  
Article
Lady’s Mantle Flower as a Biodegradable Plant-Based Corrosion Inhibitor for CO2 Carbon Steel Corrosion
by Katarina Žbulj, Gordana Bilić, Katarina Simon and Lidia Hrnčević
Coatings 2024, 14(6), 671; https://doi.org/10.3390/coatings14060671 - 25 May 2024
Cited by 1 | Viewed by 925
Abstract
Due to issues with the corrosion problem in the petroleum industry and the use of less ecologically acceptable corrosion inhibitors, great emphasis, within research on corrosion inhibitors, is now being put on green corrosion inhibitors (GCIs). In this study, Lady’s mantle flower extract [...] Read more.
Due to issues with the corrosion problem in the petroleum industry and the use of less ecologically acceptable corrosion inhibitors, great emphasis, within research on corrosion inhibitors, is now being put on green corrosion inhibitors (GCIs). In this study, Lady’s mantle flower extract (LMFE) has been observed as a plant-based GCI for carbon steel in a simulated CO2-saturated brine solution. The effectiveness of the inhibitor in static and flow conditions has been determined using potentiodynamic polarization with Tafel extrapolation and electrochemical impedance spectroscopy (EIS). In static conditions, the inhibitor has been tested at concentrations from 1 g/L to 5 g/L with an increment of 1 g/L per measurement, while, in dynamic (flow) conditions, the inhibitor has been tested at concentrations from 3 g/L to 6 g/L with an increment of 1 g/L per measurement. All measurements were performed at room temperature. EIS and potentiodynamic polarization methods showed that LMFE achieves maximum effectiveness in protecting carbon steel from corrosion when added at a concentration of 4 g/L in static conditions and at a concentration of 5 g/L in flow conditions. The test methods proved that the inhibitory effectiveness of LMFE is greater than 90% in both test conditions (static and flow). The inhibitor efficiency was attributed to the adsorption of LMFE on the carbon steel surface, which was demonstrated by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). A biodegradability of 0.96 and a toxicity of 19.34% for LMFE were determined. The conducted laboratory tests indicate that LMFE could be used as an effective corrosion inhibitor for CO2 carbon steel corrosion. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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14 pages, 9695 KiB  
Article
Performance of a Composite Inhibitor on Mild Steel in NaCl Solution: Imidazoline, Sodium Molybdate, and Sodium Dodecylbenzenesulfonate
by Xue Wang, Changfeng Fan, Lanyi Sun, Hongyan Shang, Duxin Zhang, Nan Xu, Bin Wang and Jianbin Xu
Coatings 2024, 14(6), 652; https://doi.org/10.3390/coatings14060652 - 21 May 2024
Viewed by 1031
Abstract
Mild steel corrosion is a significant challenge in oil and gas exploitation. Inhibitors are frequently employed to minimize the corrosive impact on mild steel. Mixing corrosion inhibitors is an effective method in reducing the dosage of toxic compounds and expanding the potential applications [...] Read more.
Mild steel corrosion is a significant challenge in oil and gas exploitation. Inhibitors are frequently employed to minimize the corrosive impact on mild steel. Mixing corrosion inhibitors is an effective method in reducing the dosage of toxic compounds and expanding the potential applications of inhibitors in NaCl solutions. Herein, a mixed corrosion inhibitor composed of imidazoline (IM), sodium molybdate, and sodium dodecylbenzenesulfonate (SDBS) for mild steel in a 3.5 wt% NaCl solution are investigated by orthogonal experimental design and electrochemical measurement. The imidazoline compound was synthesized and identified using Fourier transform infrared (FTIR) spectroscopy. The inhibitory effect is improved by higher concentrations of sodium molybdate and is further enhanced with the addition of 10 mg/L of SDBS. The electrochemical impedance spectroscopy indicates that the combination of IM (100 mg/L), sodium molybdate (50 mg/L), and SDBS (100 mg/L) results in excellent performance with electrochemical impedance (1.8 kohm·cm2). The mild steel surfaces after electrochemical measurement were analyzed using scanning electron microscopy (SEM). The information can contribute to the development of corrosion inhibitors with high performance or to understand the influence of mixing inhibitors on corrosion processes of mild steels. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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11 pages, 7137 KiB  
Article
Effect of Co Contents on Microstructure and Cavitation Erosion Resistance of NiTiAlCrCoxN Films
by Hongjuan Yan, Fangying Cheng, Lina Si, Ye Yang, Zhaoliang Dou and Fengbin Liu
Coatings 2024, 14(5), 603; https://doi.org/10.3390/coatings14050603 - 10 May 2024
Viewed by 917
Abstract
In order to investigate the effect of Co contents on the structure and cavitation erosion property, NiTiAlCrCoxN films were prepared by the magnetron sputtering system. The X-ray diffractometer (XRD), the scanning electron microscope (SEM) and the energy dispersive spectrometer (EDS) were [...] Read more.
In order to investigate the effect of Co contents on the structure and cavitation erosion property, NiTiAlCrCoxN films were prepared by the magnetron sputtering system. The X-ray diffractometer (XRD), the scanning electron microscope (SEM) and the energy dispersive spectrometer (EDS) were used to characterize the structure and morphology of the films. The nanoindenter and the scratch tester were used to analyze the mechanical properties of the films. Cavitation erosion experiments were carried out by the ultrasonic vibration cavitation machine. The results show that NiTiAlCrCoxN films with different Co contents have a simple face-centered cubic (FCC) structure and show a preferred orientation on the (200) crystal plane. The diffraction angle on the (200) crystal plane decreases and the interplanar spacing increases with the increase in Co content in NiTiAlCrCoxN films. NiTiAlCrCoxN films exhibit a typical columnar crystalline structure. With the increase in Co content, the nanohardness of the films increases and the elastic modulus of the films decreases, while the mass loss of cavitation erosion monotonously increases except for the film with a 1.2 Co molar ratio. The NiTiAlCrCo1.4N film has a minimum hardness of 13.264 GPa, a maximum elastic modulus of 253.22 GPa and a minimum mass loss of 0.72 mg in the cavitation erosion experiment. The NiTiAlCrCo1.4N film exhibits the best cavitation corrosion resistance because the addition of the Co element enhances the solid solution strengthening effect and the NiTiAlCrCox1.4N film with the biggest elastic modulus has better elasticity to reduce the micro jet impact. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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9 pages, 3162 KiB  
Article
Anticorrosion Method Combining Impressed Current Cathodic Protection and Coatings in Marine Atmospheric Environment
by Peichang Deng, Juyu Shangguan, Jiezhen Hu, Huan Huang and Lingbo Zhou
Coatings 2024, 14(5), 524; https://doi.org/10.3390/coatings14050524 - 24 Apr 2024
Cited by 1 | Viewed by 1381
Abstract
In this study, a new anticorrosion method combining impressed current cathodic protection (ICCP) with coatings that can be applied to marine atmospheric environments is proposed. As the corrosion medium fills the cracks and pores of the coating, an electrolyte film layer is inevitably [...] Read more.
In this study, a new anticorrosion method combining impressed current cathodic protection (ICCP) with coatings that can be applied to marine atmospheric environments is proposed. As the corrosion medium fills the cracks and pores of the coating, an electrolyte film layer is inevitably formed on the metal surface. Therefore, a graphene conductive coating with excellent chemical inertness and shielding performance is selected as the intermediate coating to form an electrolytic cell system with a metal substrate serving as the cathode and a graphene coating serving as the auxiliary anode. By studying the surface corrosion morphologies and electrochemical signals of the coating samples at different protection potentials and coating thicknesses, the optimal potential is determined to be 0.6 V, and the optimal coating thickness is determined to be 20 μm. The samples protected by the joint method have lower corrosion rates and better anticorrosion performance than those protected by the coatings alone. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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17 pages, 10995 KiB  
Article
Physical and Chemical Properties of High-Temperature Silicone-Based Polymer Coatings Applied on Different Surface Roughnesses
by Ivan Stojanović, Borna Škrlec, Marin Kurtela, Vesna Alar and Martina Odeljan
Coatings 2023, 13(12), 2100; https://doi.org/10.3390/coatings13122100 - 18 Dec 2023
Viewed by 2103
Abstract
High-temperature coatings play a crucial role in protecting surfaces exposed to extreme temperatures, corrosion, and other harsh environments. This paper focuses on the physical and chemical properties of solvent-borne and water-borne high-temperature silicone-based polymer coatings applied on two types of surface roughness of [...] Read more.
High-temperature coatings play a crucial role in protecting surfaces exposed to extreme temperatures, corrosion, and other harsh environments. This paper focuses on the physical and chemical properties of solvent-borne and water-borne high-temperature silicone-based polymer coatings applied on two types of surface roughness of carbon steel plates. The corrosion protection performance of the coatings was characterized using a salt spray chamber, humidity chamber, electrochemical impedance spectroscopy (EIS) measurements, and differential scanning calorimetry (DSC). The physical properties of high-temperature coatings were determined using the Shore D hardness method and cross-cut adhesion tests. This study investigates the effects of different surface preparation methods on coating adhesion, which is considered to be a crucial property of organic coatings for corrosion protection durability. The thermal stability of the coating was tested using furnace cyclic testing. The results show that high-temperature coatings in general exhibit excellent thermal stability, high adhesion strength, and good resistance to warm and humid environments, except in the conditions of a salty atmosphere. This study reveals that coating performance is affected by the composition and surface preparation method. This study can be useful for coating manufacturers and researchers interested in understanding the physical and chemical properties of high-temperature coatings and their applications in various environments. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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26 pages, 5488 KiB  
Article
Corrosion and Micro-Abrasion Properties of an AISI 316L Austenitic Stainless Steel after Low-Temperature Plasma Nitriding
by Darko Landek, Marin Kurtela, Ivan Stojanović, Jurica Jačan and Suzana Jakovljević
Coatings 2023, 13(11), 1854; https://doi.org/10.3390/coatings13111854 - 28 Oct 2023
Cited by 4 | Viewed by 1806
Abstract
The paper investigates the effects of DC plasma nitriding on surface roughness, hardness, microstructure, micro-abrasion, and corrosion resistance of AISI 316L Austenitic Stainless (AS) steel. The nitriding has been conducted for durations ranging from 4 to 24 h at a temperature of 430 [...] Read more.
The paper investigates the effects of DC plasma nitriding on surface roughness, hardness, microstructure, micro-abrasion, and corrosion resistance of AISI 316L Austenitic Stainless (AS) steel. The nitriding has been conducted for durations ranging from 4 to 24 h at a temperature of 430 °C in a commercial vacuum furnace, Rübig PN90/70. Micro-abrasion resistance has been tested using the calotest device with a measurement diameter of craters produced on the sample surface after 10 to 60 s of wear. Corrosion resistance has been tested using the Electroimpedance Spectroscopy (EIS) method in a 3.5% NaCl water solution. The surface roughness parameters and hardness of the samples increased with longer nitriding times, attributed to the saturation of austenite and the formation of iron and chromium nitrides. Nitriding for longer than 8 h resulted in the formation of a thicker compound layer that is hard and brittle, leading to reduced wear resistance compared with shorter nitriding times. EIS measurements revealed that nitrided samples had lower corrosion resistance compared with the untreated sample. The corrosion stability was not significantly affected by nitriding time. Different nitriding times have a great influence on resistance to pitting corrosion. This study provides valuable insights into the effects of plasma nitriding on the properties of AS steel, highlighting the importance of optimizing nitriding parameters for specific applications. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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18 pages, 24159 KiB  
Article
Wear Resistance Study of Bionic Pitted Ni Cladding Layer on 7075 Aluminum Alloy Drill Pipe Surface
by Xu Li, Ke Gao, Yan Zhao, Xiaobo Xie, Xiaoshu Lü, Cong Zhang and Hongxin Ai
Coatings 2023, 13(10), 1768; https://doi.org/10.3390/coatings13101768 - 13 Oct 2023
Viewed by 1314
Abstract
To enhance the lifespan of drill pipes and minimize wear, this study introduces a bionic structure model inspired by the pit shape structure found in the dung beetle’s abdomen. The stress distribution and wear of bionic pitted structure and ordinary structure are simulated [...] Read more.
To enhance the lifespan of drill pipes and minimize wear, this study introduces a bionic structure model inspired by the pit shape structure found in the dung beetle’s abdomen. The stress distribution and wear of bionic pitted structure and ordinary structure are simulated by finite element software. The findings revealed that the bionic structure significantly improves stress distribution, resulting in an impressive 81.3% increase in lifespan. Subsequently, the surface of the 7075 aluminum drill pipe was coated with Ni powder by a laser cladding system. Wear tests were conducted to analyze the wear and surface damage behavior of the cladding layer. The microstructure, composition, and microhardness of the cladding layer were measured and observed. The results showed that the cladding layer was mainly composed of Al3Ni2 and had high hardness. Additionally, a transition region exists between the cladding layer and the substrate, comprising relatively low hardness Al, thereby enhancing the drill pipe’s ability to withstand alternating loads. Furthermore, the bionic structure possesses the capability to store particles, effectively reducing the occurrence of abrasive wear and increasing the lifespan by 70.0%. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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17 pages, 6116 KiB  
Article
Experimental Study of Atmospherically and Infrared-Dried Industrial Topcoats
by Ivan Stojanović, Mirta Logar, Ivan Fatović, Vesna Alar and Daniela Rakela-Ristevski
Coatings 2023, 13(8), 1343; https://doi.org/10.3390/coatings13081343 - 30 Jul 2023
Cited by 4 | Viewed by 1231
Abstract
In this paper, five different solvent-borne industrial topcoats were dried with infrared (IR) radiation and under atmospheric conditions. A comparison of physical, mechanical, chemical, and electrochemical properties of differently dried topcoats was made. The results of differential scanning calorimetry (DSC), Fourier-Transform Infrared Spectroscopy [...] Read more.
In this paper, five different solvent-borne industrial topcoats were dried with infrared (IR) radiation and under atmospheric conditions. A comparison of physical, mechanical, chemical, and electrochemical properties of differently dried topcoats was made. The results of differential scanning calorimetry (DSC), Fourier-Transform Infrared Spectroscopy (FTIR), and adhesion of a topcoat to the metal substrate (determined by the pull-off test) indicate a higher degree of crosslinking of examined topcoats, which improves the coating’s protective properties. Scratch hardness was determined by the pencil hardness test. Impact resistance was examined with a falling-weight test. Changes in the shade of the coating were examined by visual inspection and using a gloss meter. The electrochemical measurements of open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) were conducted. The thermal stability of topcoats was tested by thermogravimetric analysis (TGA). The results show overall better properties of IR-dried topcoats. In addition, topcoats dry significantly faster when IR radiation is applied, which makes this drying method very interesting for industrial application. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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15 pages, 3658 KiB  
Article
Epoxy Coating Modification with Metal Nanoparticles to Improve the Anticorrosion, Migration, and Antibacterial Properties
by Marina Samardžija, Ivan Stojanović, Marija Vuković Domanovac and Vesna Alar
Coatings 2023, 13(7), 1201; https://doi.org/10.3390/coatings13071201 - 4 Jul 2023
Cited by 3 | Viewed by 4200
Abstract
Nanoparticles are capable of making more durable and stronger materials with better chemical resistance. They are used for a wide range of applications. Likewise, the potential of metal nanoparticles as antimicrobial agents has been widely studied. In this work, we investigate various nanoparticles [...] Read more.
Nanoparticles are capable of making more durable and stronger materials with better chemical resistance. They are used for a wide range of applications. Likewise, the potential of metal nanoparticles as antimicrobial agents has been widely studied. In this work, we investigate various nanoparticles (Al, Ni, Ag) incorporated into epoxy coating. The anticorrosion and antibacterial properties of the unmodified and modified coatings were evaluated. According to the SEM and EDS analyses, the coating did not contain agglomerates, which confirms the quality of the dispersion of inorganic nanoparticles in the coating. After 24 h and 10days immersions in a 3.5 wt.% NaCl solution, the corrosion behaviour for all nanocomposite was studied by means of EIS investigations. The study included the evaluation of the inhibition zone of the nanoparticles and the antimicrobial properties of the nanocomposite. It was found that the nanoparticles of Al and Ag provide excellent antibacterial properties. The epoxy nanocomposite with Al NP showed the migration of ions in the range from 0.75 to 1 mg/L in a wastewater solution for 30 days, indicating a potential for antimicrobe activity. The 1% Al NP epoxy nanocomposite showed good anticorrosion and antibacterial properties and demonstrated great potential for applications in pipelines. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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17 pages, 5330 KiB  
Article
Anticorrosion and Antibacterial Properties of Al NP–Epoxy Nanocomposite Coating on Grey Cast Iron
by Marina Samardžija, Marin Kurtela, Marija Vuković Domanovac and Vesna Alar
Coatings 2023, 13(5), 898; https://doi.org/10.3390/coatings13050898 - 10 May 2023
Cited by 4 | Viewed by 2195
Abstract
In this study, different concentrations of aluminium nanoparticles (Al NP) were incorporated into epoxy resin and epoxy paint. Here, we present a detailed systematic study of different methods of incorporating inorganic nanoparticles into epoxy coating. This work aims to obtain an epoxy coating [...] Read more.
In this study, different concentrations of aluminium nanoparticles (Al NP) were incorporated into epoxy resin and epoxy paint. Here, we present a detailed systematic study of different methods of incorporating inorganic nanoparticles into epoxy coating. This work aims to obtain an epoxy coating with anticorrosion and antibacterial properties. The physical properties of coatings such as thickness, hardness, colour, and adhesion did not change with the addition of nanoparticles. According to the SEM and EDS analyses, the distribution effect of Al NPs in epoxy coating was better with ultrasonic homogenisation than with mechanical stirring. The EIS and SECM measurements were used to investigate corrosion resistance. The coating with 1.0 wt.% Al NP showed the best physical and chemical properties. SECM examination indicated that nanoparticles in epoxy resin increase the protection efficiency by 25.75% and in the epoxy paint by 40.89%. The results also showed the antibacterial activity of aluminium nanoparticles by inhibiting the growth of biofilm-forming bacteria such as P. aeruginosa and B. subtilis. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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11 pages, 9033 KiB  
Article
Localized Corrosion Mechanism of Q125 Casing Steel in Residual Acid Solution during Oil Reservoir Acidizing
by Wei Yan, Zelin Ma, Zhi Wang, Jingru Zhang, Kepei Li, Lei Wen, Chen Li, Xiaohui Jiang and Zhengxian Xu
Coatings 2023, 13(4), 710; https://doi.org/10.3390/coatings13040710 - 31 Mar 2023
Cited by 2 | Viewed by 1618
Abstract
This paper aims to investigate the localized corrosion mechanism of Q125 casing steel in residual acid solution with Mannich base type inhibitors during oil reservoir acidizing process. The corrosion behavior of Q125 casing steel in fresh acid (20% HCl) and residual acid solution [...] Read more.
This paper aims to investigate the localized corrosion mechanism of Q125 casing steel in residual acid solution with Mannich base type inhibitors during oil reservoir acidizing process. The corrosion behavior of Q125 casing steel in fresh acid (20% HCl) and residual acid solution (pH 1.0 and pH 3.0 HCl) with and without 3-(4-chlorophenylimino)-1-(piperidine-1-ylmethyl) indolin-2-one (Mannich base type, Mb) inhibitor was studied by electrochemical test, weight loss, and surface analysis. The morphology and composition of corrosion products were analyzed by SEM/EDS and XPS; the local corrosion rate of casing steel with or without inhibitor was obtained by 3D profilometry. It was determined that the inhibitor had higher inhibition efficiency in fresh acid conditions than in residual acid conditions. Under the condition of residual acid, the decrease in inhibitor molecular coverage on the substrate surface promotes the occurrence of local corrosion. Pitting corrosion was detected in the residual acid solution containing Mannich base inhibitor, which may be related to the fact that FeCO3 hinders the adsorption of inhibitor molecules on the substrate surface. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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Review

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21 pages, 8042 KiB  
Review
A Review of Corrosion-Resistant PEO Coating on Mg Alloy
by Chao Yang, Pinghu Chen, Wenxing Wu, Liyuan Sheng, Yufeng Zheng and Paul K. Chu
Coatings 2024, 14(4), 451; https://doi.org/10.3390/coatings14040451 - 9 Apr 2024
Cited by 6 | Viewed by 1611
Abstract
The corrosion problem of Mg alloy limits its application in many engineering fields. Plasma electrolytic oxidation (PEO) is an economical and eco-friendly technology that can create a dense oxide layer on Mg alloy, offering a solution to the corrosion issue. This research summarizes [...] Read more.
The corrosion problem of Mg alloy limits its application in many engineering fields. Plasma electrolytic oxidation (PEO) is an economical and eco-friendly technology that can create a dense oxide layer on Mg alloy, offering a solution to the corrosion issue. This research summarizes the use of PEO technology in developing corrosion-resistant coatings for Mg alloys and examines the growth mode and corrosion process of PEO coatings. It is concluded that current efforts to enhance the corrosion resistance of PEO coatings on Mg alloys can be categorized into two approaches: improving the internal structure of the coating and enhancing the phase composition. This includes optimizing coating thickness, roughness, and density; repairing micropores and cracks; and introducing corrosion-resistant compounds by doping. Micropores and cracks are identified as vulnerable points for corrosion, and sealing is an effective strategy to address this. By modifying the phase composition of the coating, corrosion occurrence can be minimized, significantly boosting the corrosion resistance of Mg alloys. Finally, future challenges and potential advancements in corrosion-resistant PEO coatings for Mg alloys are discussed. Full article
(This article belongs to the Special Issue Investigation on Corrosion Behaviour of Metallic Materials)
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