Hot corrosion behavior of silicide coating on an Nb-Ti-Si based ultrahigh temperature alloy

被引：52
作者：
Qiao, Yanqiang [1 ]
Guo, Xiping [1 ]
Li, Xuan [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
CORROSION SCIENCE | 2015年 / 91卷
基金：
中国国家自然科学基金;
关键词：
Metal coatings; Intermetallic; Hot corrosion; Oxidation; OXIDATION BEHAVIOR; NIOBIUM; CR; AL; COMPOSITES; MICROSTRUCTURE; RESISTANCE; NBSI2; MORPHOLOGY; NACL;
D O I：
10.1016/j.corsci.2014.10.053
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hot corrosion behavior of an Nb-Ti-Si alloy and its suicide coating in Na2SO4-25 wt.% NaCl molten salts at 900 degrees C was investigated. For the bare alloy, a thick and porous corroded scale (Na-containing oxides) was formed after hot corrosion. The silicide coating showed a good oxidation resistance at 900 degrees C, while the presence of the molten salts aggravated the damage process of the silicide coating by forming a thick corroded scale which mainly consisted of a Na2TiSi2O7 outer layer and a porous and cracked NaNbO3 + Na2TiSi2O7 inner layer. The possible hot corrosion mechanism of the suicide coating has been explored. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：75 / 85
页数：11
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