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采用氧-乙炔火焰喷焊和等离子喷焊两种热喷涂工艺研究了不同工艺条件下喷焊层在80%硫酸、10%盐酸和饱和氯化铁溶液中耐腐蚀性能,并结合扫描电镜及能谱分析技术,对喷焊层与基体界面元素扩散进行了分析。结果表明:等离子喷焊层表面孔隙率低,表面缺陷少,涂层的致密性好,元素分布均匀,且Ni-Cr-Mo自熔性耐蚀合金涂层中主要元素Ni、Cr和Mo易于向基体内扩散。等离子喷焊涂层在还原性腐蚀介质和氧化性腐蚀介质中的耐蚀性能均优于氧-乙炔火焰喷焊涂层。
The corrosion resistance of sprayed coating in 80% sulfuric acid, 10% hydrochloric acid and saturated ferric chloride solution under different process conditions was studied by oxy-acetylene flame spray and plasma spray welding. Combining with scanning electron microscopy Spectral analysis technique was used to analyze elemental diffusion at the interface between spray coating and substrate. The results show that the surface of plasma sprayed coatings has low surface porosity, less surface defects, good coating densities and uniform distribution of elements. Ni, Cr and Mo, the main elements in Ni-Cr-Mo corrosion resistant alloy coatings, Diffusion into the matrix. Plasma spray coating corrosion resistance in reducing corrosive media and oxidizing corrosive media are better than oxy-acetylene flame spray coating.