Ni-Cu-P化学沉积镀层初期冲刷腐蚀的电化学行为

Synthesis and initial erosion-corrosion electrochemical behavior of Ni-Cu-P alloy coating

利用化学镀技术,采用碱性镀液配方,在紫铜基体上制备Ni-Cu-P三元合金镀层。经EDX分析镀层中Ni、Cu和P的含量约为78.9wt%、11.4wt%和9.7wt%,属于高磷镀层。经TEM分析镀层为混晶态结构。采用管式冲刷腐蚀试验机,利用电化学测试手段,综合宏观腐蚀形貌研究镀层初期冲刷腐蚀行为。探讨在人工海水中不同冲刷流速条件下,24 h的冲刷时间内,镀层反应的电化学阻抗谱信息。结果表明,不同冲刷流速对镀层耐蚀性能有明显的影响,冲刷条件相对于静态条件,镀层耐蚀性能明显下降,当冲刷流速为6.5 m/s时,镀层耐冲刷腐蚀性能相对于冲刷流速为3 m/s、4 m/s时,更加良好稳定。

The electroless plating technique was employed to synthesize the Ni-Cu-P ternary alloy coating on the copper from an alkaline bath.The EDS results show that the coating（78.9wt%Ni,11.4wt%Cu and 9.7wt%P） contain high phosphorus.The TEM results indicate that the structure of the coating is mixed crystal.The electrochemical corrosion behaviors of the coating after being erosion-corrosion for different time（totally 24 h） in artificial seawater at different velocity were studied.The electrochemical impedance measurements,the macro-morphology observation of corroded samples were carried out.The results show that when the velocity of seawater is 6.5 m/s,the initial erosion-corrosion resistance of the coating is even better than that of the velocity is 3 m/s or 4 m/s.When the seawater is static i.e.the velocity is 0 m/s,the initial erosion-corrosion resistance of the coating is best of all.