Effect of chromium on hot corrosion behavior of arc-sprayed NiCr coatings  

作　　者：王旭 张海燕 魏炜 高站起 尼军杰 黄智泉 Wang Xu;Zhang Haiyan;Wei Wei;Gao Zhanqi;Ni Junjie;Huang Zhiquan(Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou,450001,China)

机构地区：[1]Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou,450001,China

出　　处：《China Welding》2024年第1期1-6,共6页中国焊接（英文版）

基　　金：supported by Corporate Talent Fund Program of Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.(No.201SJ2023013);the Faculty of Materials and Manufacturing,Beijing University of Technology.

摘　　要：In this article,NiCr coatings with chromium content of 13%,27%and 41%were prepared by arc spraying.They were exposed in molten salts(NaCl-Na_(2)SO_(4))at 800℃for 200 hours.The effect of chromium content on the hot corrosion behavior of the coatings was in-vestigated.X-ray diffraction(XRD)and scanning electron microscope with energy dispersion spectrum(SEM-EDS)were used to analyze the phase compositions,morphologies and chemical compositions of the coatings.The results show that NiCr13 coating exhibited the worst hot corrosion resistance due to the low chromium content,which resulted in NiO being the major reaction product.It should be noted that the hot corrosion resistance of NiCr27 coating was better than that of NiCr41 coating.The basic fluxing of Cr_(2)O_(3) lowered its protection during the hot corrosion process and led to the formation of porous Cr_(2)O_(3) on the NiCr41 coating.The molten salts accelerated the oxidation reac-tion resulting in thicker and porous oxide scales formed on the surfaces of coatings.

关 键 词：NiCr coatings arc spraying hot corrosion Na_(2)SO_(4)-NaCl basic fluxing 

分 类 号：TG174.4[金属学及工艺—金属表面处理]