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

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

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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-Na2SO4)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 Cr2O3 lowered its protection during the hot corrosion process and led to the formation of porous Cr2O3 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.

NiCr coatingsarc sprayinghot corrosionNa2SO4-NaClbasic fluxing

王旭、张海燕、魏炜、高站起、尼军杰、黄智泉

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Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou,450001,China

Corporate Talent Fund Program of Zhengzhou Research Institute of Mechanical Engineering Co.,LtdFaculty of Materials and Manufacturing,Beijing University of Technology

201SJ2023013

2024

10.12073/j.cw.20231107016

中国焊接(英文版)
中国焊接协会 中国机械工程学会 焊接学会 哈尔滨焊接研究所

中国焊接(英文版)

影响因子：0.139
ISSN：1004-5341
年,卷(期)：2024.33(1)
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