Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection
Abstract
:1. Introduction
2. Materials and Methods
2.1. Samples
2.2. Electrochemical Measurements
2.2.1. SVET and SIET Measurements
2.2.2. Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization Measurements
2.3. Cross-Section Preparation
3. Results and Discussion
3.1. Study of the Localized Corrosion Process on the 1579 Al Alloy Sample with PEO-Coating
3.2. Study of the Localized Corrosion Process on the 1579 Al Alloy Sample with the Composite Polymer-Containing Coating
3.3. Corrosion Performance of the 1579 Al Alloy Samples
3.4. EIS, OCP, and PDP Studies of Electrochemical Properties of the 1579 Al Alloy Samples
4. Conclusions
- The coating obtained by the PEO method in tartrate-fluoride electrolyte decreases the corrosion intensity of the studied sample. The current density difference between anodic and cathodic areas for the PEO treated sample decreased by more than one order of magnitude as compared to the bare 1579 aluminium alloy, from 400 μA cm−2 down to 18 μA cm−2, according to SVET and SIET.
- According to SVET/SIET data, the area of the welded joint, which is an activator of the corrosion process in contact with the aggressive environment, became a cathodic zone due to the PEO-layer, which prevented the corrosion destruction of the studied material.
- The promising method of PEO-layer modification using superdispersed polytetrafluoroethylene (SPTFE) was applied. It has been established that single SPTFE treatment enables one to significantly improve the protective properties of the PEO-coated 1579 Al alloy (more than 5.5-fold), see the SVET/SIET data.
- Electrochemical methods (OCP, EIS, and PDP) showed a high level of sample protection using PEO-based coatings. The value of the impedance modulus at low frequency as well as that of the corrosion current density corroborated a significant corrosion inhibition in chloride-containing media for the Al alloy sample with a welded joint through the PEO-layer (240 kΩ cm2, 10 nA/cm2) and composite polymer-containing coating (93 MΩ cm2, 28 pA/cm2) formation.
- The combined results of Part 1 and Part 2 of this study indicate that SVET and SIET represent useful methods to characterize and to compare corrosion behaviour of the coated and uncoated samples with a welded joint in chloride-containing media. The data obtained using localized and conventional electrochemical methods enabled us to choose the appropriate multiplicity of PEO-coating treatment with polymer.
Author Contributions
Funding
Conflicts of Interest
References
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Mg | Zn | Cu | Si | Fe | Zr | Sc | Cr | Ni | Ti | Al |
---|---|---|---|---|---|---|---|---|---|---|
6.78 | 0.62 | 0.14 | 0.51 | 0.15 | 0.13 | 0.13 | 0.17 | 0.10 | 0.02 | balance |
Sample # | Type of Sample Surface | |Z|f=0.1Hz (Ω cm2) | IC (A/cm2) | EC (V vs. SCE) | βa (mV/Decade) | −βc (mV/Decade) |
---|---|---|---|---|---|---|
1 | Without coating | 1.3 × 103 | 1.4 × 10−6 | −0.739 | 16.7 | 1114.8 |
2 | PEO-layer | 2.4 × 105 | 1.0 × 10−8 | −0.728 | 63.8 | 1320.0 |
3 | Composite polymer-containing coating | 9.3 × 107 | 2.8 × 10−11 | 0.523 | 285.24 | 89.9 |
Sample # | Type of Sample Surface | CPE1 | R1 (Ω cm2) | CPE2 | R2 (Ω cm2) | ||
---|---|---|---|---|---|---|---|
Q (S cm−2 sn) | n | Q (S cm−2 sn) | n | ||||
1 | Without coating | – | – | – | 1.2 × 10−5 | 0.95 | 4.3 × 103 |
2 | PEO-layer | 4.4 × 10−7 | 0.76 | 2.7 × 102 | 8.9 × 10−7 | 0.85 | 2.7 × 105 |
3 | Composite polymer-containing coating | 3.7 × 10−10 | 0.97 | 7.9 × 105 | 1.9 × 10−8 | 0.87 | 6.8 × 108 |
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Gnedenkov, A.S.; Sinebryukhov, S.L.; Mashtalyar, D.V.; Vyaliy, I.E.; Egorkin, V.S.; Gnedenkov, S.V. Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection. Materials 2018, 11, 2177. https://doi.org/10.3390/ma11112177
Gnedenkov AS, Sinebryukhov SL, Mashtalyar DV, Vyaliy IE, Egorkin VS, Gnedenkov SV. Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection. Materials. 2018; 11(11):2177. https://doi.org/10.3390/ma11112177
Chicago/Turabian StyleGnedenkov, Andrey S., Sergey L. Sinebryukhov, Dmitry V. Mashtalyar, Igor E. Vyaliy, Vladimir S. Egorkin, and Sergey V. Gnedenkov. 2018. "Corrosion of the Welded Aluminium Alloy in 0.5 M NaCl Solution. Part 2: Coating Protection" Materials 11, no. 11: 2177. https://doi.org/10.3390/ma11112177