热处理温度对硬铬镀层性能的影响

Effects of Heat Treatment Temperature on Properties of Hard Chromium Coating

研究了热处理温度对硬铬镀层性能的影响 .发现经过 2 0 0～ 3 0 0℃1h热处理 ,镀层硬度明显提高 ,耐磨性得到改善 ,但硬度和耐磨性的最优点对应不同的热处理温度 .对镀层XPS分析表明 ,热处理过的镀层中有有机碳化物析出 .对镀层的EDAX分析表明 ,热处理使镀层表面氧含量增高 ,但对镀层微裂纹数量和宽度没有明显影响 .对镀层的XRD实验结果表明 ,热处理后镀层的晶体结构未发生改变 .

Microhardness and wear resistance of a hard chromium coating obtained with a solution containing organic additive were investigated as a function of heat treatment temperature. Meanwhile, XPS, EDAX and X-ray diffraction analyses were conducted to reveal the underlying micromechanism. It was found that: (1) the microhardness and the wear resistance both were significantly improved when the coating was heat-treated at 200°C-300°C for 1 hour; (2) the content of carbon element within coating was rather high; (3) no changes in crystal structure could be detected for the heat-treated coating. Based on the above results, it was suggested that some sort of organic carbonides must be generated during the heat-treatment, which should be responsible for the properties and improvements.