Inhibitor-Containing Composite Coatings on Mg Alloys: Corrosion Mechanism and Self-Healing Protection

Andrey S. Gnedenkov; Sergey L. Sinebryukhov; Dmitry V. Mashtalyar; Sergey V. Gnedenkov

doi:10.4028/www.scientific.net/SSP.245.89

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Inhibitor-Containing Composite Coatings on Mg Alloys: Corrosion Mechanism and Self-Healing Protection

Abstract:

The way of self-healing coating formation at the surface of magnesium alloys by means of plasma electrolytic oxidation method (PEO) with subsequent filling of the obtained layer with inhibitor has been suggested. The electrochemical properties of such coatings have been described in details. The obtained experimental results indicate that the protective properties of the samples with inhibitor-containing coating were increased (I_C = 8.6×10^–8A/cm²) in comparison with the samples without coating (5.3×10^–5A/cm²) and the base coating obtained by plasma electrolytic oxidation method (PEO) (3.4×10^–7 A/cm²). The local scanning electrochemical methods of surface investigation, notably Scanning Vibrating Electrode Technique (SVET) and Scanning Ion-Selective Electrode Technique (SIET) were used for determining the kinetics and mechanism of the self-healing process. The treatment by the solution containing 8-hydroxyquinoline, which inhibits the corrosion process, enables one to increase the protective properties of the composite coating in 30 times in the corrosion-active environment in comparison with the base PEO-coating and avert the intensive destruction of the material.

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Periodical:

Solid State Phenomena (Volume 245)

Pages:

89-96

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.245.89

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Online since:

October 2015

Authors:

Andrey S. Gnedenkov*, Sergey L. Sinebryukhov, Dmitry V. Mashtalyar, Sergey V. Gnedenkov

Keywords:

EIS, Magnesium Alloys, Protective Coatings, Self-Healing, SIET, SVET

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