Creating high-performance bi-functional composite coatings on magnesium-8lithium alloy through electrochemical surface engineering with highly enhanced corrosion and wear protection

摘要

The creation of high-performance bi-functional anti-corrosion/anti-wear coatings on superlight magnesium-lithium (Mg-Li) alloy remains a formidable task in real-life engineering field. In this work, we present a simple method to access coatings on Mg-8Li alloy by plasma electrolytic oxidation (PEO) using different additives, including graphite powders, WS2, and MoS2 nanosheets. The results show that the coating produced with WS2 hold a more compact structure, with the highest water contact angles in different pH conditions, contributing to the substantially enhanced corrosion protection even in longterm immersion. Moreover, bonding strength and wear-resistant testings reveal the significant role of WS2 on anti-wear performance. (C) 2019 Elsevier B.V. All rights reserved.