High-Temperature Oxidation and Smelt Deposit Corrosion of Ni-Cr-Ti Arc-Sprayed Coatings

被引：0
作者：
S. Matthews
M. Schweizer
机构：
[1] Massey University,School of Engineering and Advanced Technology
[2] The University of Auckland,Department of Chemical and Materials Engineering
[3] Aalen University of Applied Sciences,Department of Surface and Materials Technology
来源：
Journal of Thermal Spray Technology | 2013年 / 22卷
关键词：
arc-sprayed microstructure; black liquor recovery boiler; high-temperature oxidation; Ni-Cr-Ti; smelt deposit corrosion;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
High Cr content Ni-Cr-Ti arc-sprayed coatings have been extensively applied to mitigate corrosion in black liquor recovery boilers in the pulp and paper industry. In a previous article, the effects of key spray parameters on the coating’s microstructure and its composition were investigated. Three coating microstructures were selected from that previous study to produce a dense, oxidized coating (coating A), a porous, low oxide content coating (coating B), and an optimized coating (coating C) for corrosion testing. Isothermal oxidation trials were performed in air at 550 and 900 °C for 30 days. Additional trials were performed under industrial smelt deposits at 400 and 800 °C for 30 days. The effect of the variation in coating microstructure on the oxidation and smelt’s corrosion response was investigated through the characterization of the surface corrosion products, and the internal coating microstructural developments with time at high temperature. The effect of long-term, high-temperature exposure on the interaction between the coating and substrate was characterized, and the mechanism of interdiffusion was discussed.
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页码：932 / 946
页数：14
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