Preparation and corrosion resistance of MAO layer/Yb2SiO5 composite coating on Mg alloy

• Published in: Surface & coatings technology Vol. 240; pp. 118 - 127
• Main Authors: Fan, Xizhi, Xu, Jiaying, Wang, Ying, Ma, Hongmei, Zhao, Sumei, Zhou, Xin, Cao, Xueqiang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.02.2014; Elsevier
• Subjects: Applied sciences; Bonding; Coating; Coatings; Composite coatings; Corrosion; Corrosion environments; Corrosion prevention; Corrosion resistance; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Hardness; Interface; Magnesium; Magnesium base alloys; MAO; Materials science; Metals. Metallurgy; Physics; Production techniques; Protective coatings; Surface treatment; Surface treatments; Corrosion resistance; MAO; Magnesium; Interface; Interfaces; Composite materials; Corrosion; Composite coating; Corrosion products; Surface treatments
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2013.12.024

Microarc oxidation (MAO) layer and atmospheric plasma spraying (APS) Yb2SiO5 coat were successfully prepared on Mg alloy to improve the corrosion resistance of the substrate. Bond stability and protection of the composite coating were investigated. The results show that thermal sprayed Yb2SiO5 coat has good compatibility with MAO layer. The composite coating is well bonded with Mg alloy. MAO layer provides a stable interface and high hardness for Mg alloy to bond with Yb2SiO5 coat. The composite coating shows excellent thermal shock resistance. Porous MAO coating is effectively sealed by the melted Yb2SiO5. The MAO layer/Yb2SiO5 composite coating significantly improves the corrosion resistance of Mg alloy. •MAO layer/Yb2SiO5 is designed to improve the corrosion resistance of Mg alloy.•MAO layer provides stable interface and high hardness to bond with Yb2SiO5 coat.•Porous MAO coat is well sealed by thermal sprayed Yb2SiO5 coat.•MAO layer/Yb2SiO5 coat shows prominent corrosion resistance in solution or steam.