Green Inhibitors for Metals Corrosion: Electrochemical Investigations

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 763

Special Issue Editor


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1. Faculdade de Tecnologia, FT, Universidade Estadual de Campinas/UNICAMP, Campus I, Limeira 13484-350, Brazil 2. Faculdade de Ciências Aplicadas, FCA, Centro de Manufatura de Materiais Avançados (CPMMA), UNICAMP, Campus II, Limeira 13484-332, Brazil
Interests: mechanical properties; corrosion resistance; aluminum alloys; compounds; lightweight aspects; biomaterials
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Special Issue Information

Dear Colleagues,

It is recognized that pure metals and metallic alloys are intensively susceptible to corrosion. This means a degradation phenomenon, where, in particular point of view, the metals are subjected to an electrochemical condition. This is caused by the potential difference between the anode (which can be a phase of a metallic material) and the cathode (another phase or intermetallic compound). In order to decrease corrosion effects, inhibitor contents are added to the corrosive medium. These compounds are adsorbed onto the metal surface, and corrosive effects can thus be minimized. The majority of inhibitors contain contaminants and harmful particles. Based on this, a new class of corrosion inhibitors, designated as green inhibitors, is emerging, with particular focus being paid to their biodegradability, low toxicity, availability, and environmental friendliness. In this Special Issue, a wide set of manuscripts and investigations focusing on the above-mentioned aspects will be included. Thus, investigations involving metals and metallic alloys and compounds, by using electrochemical impedance spectroscopy and potentiodynamic polarization techniques, are expected to characterize corrosion inhibitor behavior. Distinctive and modified media and materials are characterized and evaluated. Therefore, researchers are invited to propose original investigations, involving a wide range of materials that demonstrate the effects and characteristics of green inhibitors.

Dr. Wislei Riuper Osório
Guest Editor

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Keywords

  • modified inhibitors
  • environmentally friendly corrosion inhibitors
  • green chemistry
  • aluminum alloys
  • steel pipelines

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Published Papers (1 paper)

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Research

26 pages, 5289 KiB  
Article
Drimia maritima as a New Green Inhibitor for Al-Si Alloy, SAE Steel and Pure Al Samples in 0.5 M NaCl Solution: Polarization and Electrochemical Impedance Analyses
by Rodrigo S. Bonatti, Diego Costa, Giovana S. Padilha, Ausdinir D. Bortolozo and Wislei R. Osório
Metals 2024, 14(10), 1147; https://doi.org/10.3390/met14101147 - 8 Oct 2024
Viewed by 513
Abstract
The corrosion inhibition effects of Drimia maritima (L.) Stearn sin. Urginea maritima (L.) Backer on three different materials, i.e., as-cast Al-7 wt.% Si alloy, SAE 1020 low carbon steel, and commercially pure Al samples, into a stagnant and naturally aerated 0.5 M NaCl [...] Read more.
The corrosion inhibition effects of Drimia maritima (L.) Stearn sin. Urginea maritima (L.) Backer on three different materials, i.e., as-cast Al-7 wt.% Si alloy, SAE 1020 low carbon steel, and commercially pure Al samples, into a stagnant and naturally aerated 0.5 M NaCl solution are evaluated. For this purpose, both the potentiodynamic polarization curves and electrochemical impedance spectroscopy with an equivalent circuit are utilized. It is found that inhibition effect increases up to certain minor Drimia maritima content. Adsorption isotherms (e.g., Langmuir and Temkin) indicate that all three examined materials comprise physical adsorption mechanisms. Al-Si alloys attained inhibition efficiencies of about 96% at 25 °C with 1250 ppm of Drimia maritima and ~43% with 625 ppm at 45 °C. On the other hand, the cp. Al and SAE 1020 samples attain ~89% and 68% with 1250 ppm and 500 ppm at 25 °C, respectively. This clearly indicates that the dosage of Drimia maritima green inhibitor into NaCl solution possesses certain susceptibility for each distinctive material examined. Impedance parameters obtained by using CNLS (complex non-linear least squares simulations) are correlated and discussed. Full article
(This article belongs to the Special Issue Green Inhibitors for Metals Corrosion: Electrochemical Investigations)
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