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采用氯化物溶液在430不锈钢表面电沉积Co-Mn合金,重点研究了镀液pH值和电流密度对镀层微观结构及成分的影响。结果表明:pH值为2.5~6.5、电流密度为125~225mA/cm2时,镀层中的Mn含量随着pH值和电流密度的增大而增加;电流密度为125和175mA/cm2时,pH值是决定合金成分的主要因素,电流密度达到225mA/cm2时电流密度是影响合金成分的主要因素;电镀Co-Mn合金的优化工艺参数为pH值为4.5、电流密度为125mA/cm2,此时镀层质量良好,Mn含量可达20%(原子分数)以上;通过除氢处理及在800℃空气中的氧化处理,合金镀层转变为连续、与基体结合良好的MnCo2O4尖晶石涂层。
The Co-Mn alloy was electrodeposited on the surface of 430 stainless steel with chloride solution. The effects of bath pH and current density on the microstructure and composition of the coating were mainly studied. The results showed that the Mn content in the coating increased with the increase of pH value and current density when the pH value was 2.5-6.5 and the current density was 125-225mA / cm2. When the current density was 125 and 175mA / cm2, the pH value Is the main factor that determines the composition of the alloy. The current density is the main factor that affects the composition of the alloy when the current density reaches 225mA / cm2. The optimized process parameters of the Co-Mn alloy are pH 4.5 and current density 125mA / cm2. Good quality, Mn content up to 20% (atomic fraction) or more; Through hydrogen treatment and oxidation at 800 ℃ in air, the alloy coating into a continuous, good combination with the substrate MnCo2O4 spinel coating.