电沉积制备Ni-Co合金镀层及耐蚀性能研究

Study on Plating and Corrosion Resistance of Electrodeposition Preparing for Ni-CO Alloy

为了减弱腐蚀,增强基体的使用寿命,以316L不锈钢片为基体,采用电沉积法制备了Ni-Co合金镀层。使用扫描电镜对镀层的微观形貌进行表征,利用VersaSTAT3电化学工作站测试镀层在3.5%的NaCl溶液中的腐蚀电流密度。研究了不同主盐浓度、镀液温度及电流密度对合金镀层性能的影响规律。结果表明,电镀液中镍盐质量浓度为128 g/L时,钴盐质量浓度为115 g/L,镀液温度为55℃,p H值为4.5,电流密度为1.0 A/dm2,腐蚀电流密度为6.13×10^(-12)A/cm^(2)时,所得Ni-Co合金镀层的耐腐蚀效果最佳。

In order to reduce corrosion, the life of the substrate is enhanced, and the Ni-Co alloy plating layer is prepared by electrodeposition method at a substrate for 316 L stainless steel sheet. The microscopic morphology of the plating layer was characterized by the scanning electron microscope, and the corrosion current density of the coating in a 3.5 % NaCl solution was tested using a Versast3 electrochemical workstation. The effects of different primary salt concentrations, electroplating fluid temperature and current density on alloy coating performance were studied. The results show that when the concentration of the nickel salt mass in the electroplating liquid is 128 g/L, the cobalt salt mass concentration is 115 g/L, the plating temperature is 55 ℃, the current density is 1.0 A/dm2, the corrosion current density is 6.13×10^(-12) A/cm^(2), the corrosion resistant effect of the obtained Ni-Co alloy coating was the best.