COMPARISON OF THE INFLUENCE OF PHYTIC ACID AND SILANE ADDITIVES ON CORROSION RESISTANCE OF CERAMIC COATINGS ON Mg ALLOY BY PEO METHOD

Sung-Nam Pak, Kyong-Sik Ju, Kwang-Won Nam and Chol-Ho Pang
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Sung-Nam Pak: Department of Energy Science, Kim Il Sung University, Pyongyang 999093, Democratic People’s Republic of Korea
Kyong-Sik Ju: #x2020;Institute of Advanced Science, Kim Il Sung University, Pyongyang 999093, Democratic People’s Republic of Korea
Kwang-Won Nam: Department of Energy Science, Kim Il Sung University, Pyongyang 999093, Democratic People’s Republic of Korea
Chol-Ho Pang: #x2021;Kimchaek University of Technology, Pyongyang 950003, Democratic People’s Republic of Korea

Surface Review and Letters (SRL), 2021, vol. 28, issue 07, 1-10

Abstract: Phytic acid (PA) and 3-aminopropyltrimethoxysilane (APTMS) were selected as organic additives and respectively doped into Na2SiO3-NaOH electrolyte to prepare ceramic coatings on AZ31B Mg alloys by Plasma Electrolytic Oxidation (PEO) method. The influences of two additives on corrosion resistance of the PEO coatings were compared. The microstructure, composition and corrosion resistance of the PEO coatings were examined by SEM, EDX, XPS, XRD, potentiodynamic polarization test and EIS measurement. The results indicated that each additive increased both the coating thickness and corrosion resistance. However, the PA-doped PEO coating achieves larger thickness but exhibits worse corrosion resistance than the APTMS-doped PEO coating due to larger pore size and looser microstructure.

Keywords: Plasma electrolytic oxidation; corrosion resistance; additive; phytic acid; silane (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21500633

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