Corrosion and wear behavior of wire-arc sprayed Ni-based coatings - 文章详情页

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摘要：

A　new　Ni-based　cored　wire　was　designed　to　prepare　coatings　by　wire-arc　spraying　on　SA　213-T2　substrate　in　order　to　solve　the　corrosion　and　wear　problems　in　waste-to-energy　(WTE)　plants.　According　to　X-ray　diffractometry　(XRD)　and　scanning　electron　microscopy　(SEM)　analysis,　the　as-deposited　coatings　with　low　content　of　oxide　phases　presented　uniform　and　dense　layered　structure　with　porosity　at　around　3%.　The　wear　resistance　of　the　designed　coating,　about　7　times　higher　than　that　of　the　substrate,　was　measured　by　a　rubber　wheel　abrisive　testing　machine.　Thermo-gravimetric　technique　was　used　to　investigate　the　high-temperature　corrosion　behavior　of　the　coatings　in　molten　salt　environment　(Na2SO4-10%　NaCl)　at　800°C　in　a　muffle　furnace.　As　a　result,　the　weight　gain　curve　of　the　coating　followed　the　parabolic　law　and　presented　extremely　lower　corrosion　rates,　comparing　with　that　of　the　substrate,　due　to　the　formation　of　Cr2O3　and　NiCr2O4　oxide　films　on　the　surface　which　prevented　the　diffusion　or　penetrating　of　corrosive　species.　Consequently,　the　developed　coating　could　provide　much　better　corrosion　resistance　properties　than　SA213-T2　substrate.

关键词：

Chromium compounds Corrosion prevention Corrosion rate Corrosion resistance Corrosion resistant coatings Corrosive effects Diffusion coatings High temperature corrosion Microstructure Nickel compounds Oxide films Scanning electron microscopy Sodium chloride Sodium sulfate Sprayed coatings Testing Wear of materials Wear resistance Wire X ray diffraction analysis

作者机构：

[ 1 ] [Zhao, Xiaozhou]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Zhou, Zheng]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [He, Dingyong]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Zhao, Qiuying]Postdoctoral Research Station of Mechanical Engineering, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Li, Ran]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Jiang, Jianmin]College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

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zhouzhengbjut@bjut.edu.cn

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