陶瓷颗粒添加对热喷涂不锈钢涂层耐蚀性的影响

Effect of ceramic particles on corrosion resistance of thermal sprayed stainless steel coating

采用超音速火焰喷涂(HVAF)方法成功制备出不同种类及粒度陶瓷颗粒复合的不锈钢涂层,系统研究陶瓷颗粒的种类及粒度对复合涂层的硬度、孔隙率与耐蚀性能的影响;通过扫描电子显微镜、全自动硬度计、Image Pro Plus软件以及电化学工作站等分析测试技术对不锈钢/陶瓷颗粒复合涂层的微观结构、硬度及腐蚀行为进行系统表征与分析。结果表明:粗粒径棕刚玉(Al_(2)O_(3))复合的不锈钢涂层的孔隙率低(0.7863%)、硬度高(637HV_(0.1))且耐蚀性能优异,其自腐蚀电位为-454.14 mV、自腐蚀电流密度为22.208 mA·cm^(-2);细粒径碳化硅(SiC)复合的不锈钢涂层具有较高的硬度(600HV_(0.1))及较好的耐蚀性能,其自腐蚀电位为-463.68 mV、自腐蚀电流密度为23.738 mA·cm^(-2)。

The ceramic particles of different types and sizes reinforced stainless steel composite coatings were successfully prepared by high-velocity air fuel(HVAF)spraying technique.The effects of the types and sizes of ceramic particles on the hardness,porosity and corrosion resistance of the composite coating were systematically studied.The microstructure,hardness and corrosion behavior of stainless steel/ceramic particle composite coating were systematically characterized and analyzed by scanning electron microscope,automatic hardness tester,Image Pro Plus software and electrochemical workstation.The results show that the larger brown alumina(Al_(2)O_(3))particles reinforced stainless steel composite coating has low porosity(0.7863%),high hardness(637 HV_(0.1))and excellent corrosion resistance,and its self-corrosion potential is-454.14 mV and self-corrosion current density is 22.208 mA·cm^(-2).The fine silicon carbide(SiC)particles reinforced stainless steel composite coating also has a relatively high hardness(600 HV_(0.1))and good corrosion resistance,and its self-corrosion potential is-463.68 mV and self-corrosion current density is 23.738 mA·cm^(-2).