Degradation behavior of PEO coating on AM50 magnesium alloy produced from electrolytes with clay particle addition
authors Lu, XP; Sah, SP; Scharnagl, N; Stormer, M; Starykevich, M; Mohedano, M; Blawert, C; Zheludkevich, ML; Kainer, KU
nationality International
journal SURFACE & COATINGS TECHNOLOGY
author keywords Magnesium; Plasma electrolytic oxidation; Clay particle; Amorphous phase; Degradation control
keywords SOL-GEL COATINGS; CORROSION-RESISTANCE; MG ALLOY; OXIDATION; AZ91D; PHOSPHATE; FILMS; PERFORMANCE; PROTECTION; AA2024-T3
abstract Amorphous plasma electrolytic oxidation (PEO) coating with sealed discharge channels can be formed in alkaline phosphate electrolyte containing montmorillonite clay particles. The effect of various concentrations of phosphate and hydroxide ions in the clay-containing electrolyte on the microstructure of the coatings was studied in the present work and correlated with the corrosion behavior. The clay particles were reactively incorporated into the coating. Single amorphous phase appears in PEO coatings produced from electrolytes containing higher concentration of phosphate. These amorphous coatings are degrading within a relatively short period in 0.5 wt% NaCl solution. Electrolytes containing higher concentration of KOH tend to produce mixed PEO coatings composed of crystalline and amorphous phases. These layers demonstrate higher corrosion resistance and degradation stability. Thus, the degradation rate of PEO coatings is governed mostly by the stability of their phase composition, which might be controlled by varying electrolyte composition. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0257-8972
year published 2015
volume 269
beginning page 155
ending page 169
digital object identifier (doi) 10.1016/j.surfcoat.2014.11.027
web of science category Materials Science, Coatings & Films; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000353747000020
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