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采用冷气动力喷涂技术在低碳钢表面制备了304不锈钢涂层,并分别进行300、600、800和950℃保温1 h的退火热处理,研究了不同退火温度对涂层组织和耐蚀性能的影响。结果表明:冷喷涂涂层由大量变形粒子搭接构成,粒子间界面清晰可见。950℃退火处理后,涂层组织由等轴晶构成,大量粒子间界面消失。电化学测试结果表明涂层的腐蚀速率随退火温度升高而降低,涂层在950℃退火条件下达到最低腐蚀速率0.145 mm/y。
304 stainless steel coatings were prepared on the surface of mild steel by cold-air dynamic spraying technique and annealed at 300, 600, 800 and 950 ℃ for 1 h respectively. The effects of annealing temperature on the microstructure and corrosion resistance of the coatings were studied. . The results show that the cold sprayed coating consists of a large number of deformed particles lapped and the interfacial interface is clearly visible. After annealed at 950 ℃, the microstructure of the coating is composed of equiaxed grains, and the interface between a large number of particles disappears. Electrochemical test results showed that the corrosion rate of the coating decreased with the increase of annealing temperature, and the coating reached the lowest corrosion rate of 0.145 mm / y at 950 ℃.