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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 use of electroless plating technology, the use of alkaline plating solution, the preparation of Ni-Cu-P ternary alloy coating on a copper substrate. The content of Ni, Cu and P in the coating analyzed by EDX is about 78.9wt%, 11.4wt% and 9.7wt%, belonging to the high phosphorus coating. TEM analysis of the coating for the mixed crystalline structure. Using tube erosion test machine, the use of electrochemical test means, the integrated macro-corrosion morphology of the initial erosion of the corrosion behavior. Electrochemical impedance spectroscopy (EIS) spectra of the coating reaction under different scouring flow rates in artificial seawater for 24 h were explored. The results show that the corrosion rate of coating is significantly affected by the flow rate of different scouring, and the corrosion resistance of the coating is obviously decreased when the scouring condition is compared to the static condition. When the scouring flow rate is 6.5 m / s, the scouring corrosion resistance of the coating is 3 m / s, 4 m / s, the more stable.