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首页> 外文期刊>Journal of Korean Institute of Metal and Materials >Corrosion Behavior of Thermally Sprayed WC Based Cermet Coatings in Acidic Solution
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Corrosion Behavior of Thermally Sprayed WC Based Cermet Coatings in Acidic Solution

机译：热喷涂WC基金属陶瓷涂层在酸性溶液中的腐蚀行为

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摘要

A study was made to investigate the corrosion and corrosion-wear performances in strong acid (5 wt percent H_2SO_4) solution for the high-velocity oxygen-fuel (HVOF) sprayed coatings of tungsten carbide (WC) cermets. Four different alloy compositions were used as WC cermet coating materials in this study, and they were WC-Co, WC-Ni, WC-Co-Cr and WC-CrC-Ni. The immersion test and electrochemical test showed that galvanic corrosion occurred between WC particle and binder metal in the coating layer and general corrosion occurred on metallic binder for non-Cr added WC-Co and WC-Ni coatings. The best anti-corrosion properties were observed in the metallic Cr containing WC-Co-Cr layer, which was presumably due to the formation of beneficial chromium oxide on the coating surface. It was found that the corrosion resistance of WC cermet coatings was dependent on the compositions of binder metals as well as the micro-crack ratio of coated layer.
机译：进行了研究，以研究强酸（5％H_2SO_4）溶液对碳化钨（WC）金属陶瓷的高速氧-燃料（HVOF）喷涂涂层的腐蚀和腐蚀磨损性能。在这项研究中，四种不同的合金成分被用作WC金属陶瓷涂层材料，它们是WC-Co，WC-Ni，WC-Co-Cr和WC-CrC-Ni。浸渍测试和电化学测试表明，涂层中WC颗粒与粘合剂金属之间发生了电偶腐蚀，对于不添加Cr的WC-Co和WC-Ni涂层，金属粘合剂普遍腐蚀。在含金属铬的WC-Co-Cr层中观察到最佳的防腐性能，这可能是由于在涂层表面形成了有益的氧化铬所致。发现WC金属陶瓷涂层的耐腐蚀性取决于粘合剂金属的组成以及涂层的微裂纹率。

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