Effect of heat treatment on corrosion resistance of Al2O3-TiO2 ceramic coating impregnated with aluminum phosphate

Tuan Nguyen Van; Tuan Anh Nguyen; Ha Pham Thi; Ly Pham Thi; Phuong Nguyen Thi; Quy Le Thu

doi:10.15625/2525-2518/17219

Author affiliations

Authors

Tuan Nguyen Van Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Tuan Anh Nguyen Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Ha Pham Thi Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Ly Pham Thi Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Phuong Nguyen Thi Institute for Tropical Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Ha Noi, Viet Nam
Quy Le Thu National Key Laboratory for Welding and Surface Treatment Technologies, National Research Institute of Mechanical Engineering, 4 Pham Van Dong, Cau Giay, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/17219

Keywords:

Al2O3-40TiO2 coating, acrylic emulsion coating, heat treatment

Abstract

The atmospheric plasma spray process (APS) is a well-established and widely employed technology used to create various types of coating for the fabrication of numerous industrial applications. Speciallity, this process is considered as a suitable technique for fabricating ceramic coatings. However, the structure of thermal spray coatings consists of particles, semi-molten particles, oxides, pores, and cracks that signiﬁcantly inﬂuence the coating properties, especially their erosion-corrosion resistance. In this study, the Al₂O₃-40TiO₂ coating applied by APS was penetrated with aluminum phosphate (APP) by ultrasonic excitation method, and then, the effect of heat treatment after the sealing on corrosion protection of Al₂O₃-40TiO₂ ceramic coating was investigated. The results show that, after being impregnated with APP, the heat treatment at 800 ^oC assures the coating a lower porosity and better corrosion resistance than heat treatments at 400 and 600 ^oC. The existence of the durable crystalline phases Al(PO₃)₃(Cubic), Al₂P₆O₁₈(Monoclinic), and AlPO₄(Orthorhombic) on the surface of the sample heat-treated at 800 ^oC has contributed to enhancing the corrosion resistance of the Al₂O₃-40TiO₂coating.

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