Corrosion resistance and tribological behavior of ZK30 magnesium alloy coated by plasma electrolytic oxidation
authors Rodrigues, JD; Antonini, LM; Bastos, AAD; Zhou, J; Malfatti, CD
nationality International
journal SURFACE & COATINGS TECHNOLOGY
author keywords Magnesium; Biodegradation; PEO; Corrosion; Wear
keywords DEGRADATION BEHAVIOR; MICROARC OXIDATION; CERAMIC COATINGS; WEAR PROPERTIES; PEO; AZ31; PERFORMANCE; IMPROVEMENT; MECHANISMS; ALUMINUM
abstract The rapid bio-corrosion of magnesium-based alloys, the formation of hydrogen gas and, consequently, the premature loss of biomechanical functions hinder their applications as biodegradable implant materials. The corrosion becomes even accelerated, when fretting wear occurs at implant junctions, as a result of repeated disruptions of the magnesium (hydr)oxide layer formed on implant surfaces. To improve the overall performance of these materials in a bio-relevant environment, especially corrosion resistance and wear resistance, in this research, plasma electrolytic oxidation (PEO) was applied to create a coating on a magnesium alloy, ZK30. The resulting gains in corrosion resistance and wear resistance were evaluated. In vitro immersion tests in Hank's solution at 37 degrees C showed a reduction in hydrogen release from the PEO-treated alloy. The results obtained from applying the scanning vibrating electrode technique (SVET) indicated a decreased susceptibility of the PEO-treated alloy to localized corrosion, accounting for the improved corrosion resistance. In addition, PEO was found to change the surface topography and roughness, in addition to surface chemistry, which contributed to an increased but stable coefficient of friction and a decreased material removal rate, as revealed by the tribological tests with a ball-on-plate configuration. The results indicate an enlarged opportunity of magnesium-based materials for orthopedic applications, where friction and wear are involved, by applying PEO.
publisher ELSEVIER SCIENCE SA
issn 0257-8972
isbn 1879-3347
year published 2021
volume 410
digital object identifier (doi) 10.1016/j.surfcoat.2021.126983
web of science category 12
subject category Materials Science, Coatings & Films; Physics, Applied
unique article identifier WOS:000655539400043
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journal analysis (jcr 2019):
journal impact factor 3.784
5 year journal impact factor 3.754
category normalized journal impact factor percentile 83.171
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