Incoloy-800H合金表面镀镍层在氯化物熔盐中的腐蚀行为

Corrosion Behavior of Incoloy-800H Alloy Surface Nickel Plating in Chloride Molten Salts

采用电镀技术在Incoloy-800H合金表面制备纯镍镀层,研究了其在静态高温氯化物熔盐环境中的腐蚀行为。结果表明,在氨基磺酸镍镀液中,通过电镀可以获得性能良好,结合力良好的纯镍金属镀层。镍镀层能够有效阻止Cr元素扩散,避免Cr与熔盐直接接触而腐蚀,有效降低材料的腐蚀速率。应用菲克第二定律,得出在700℃氯化物熔盐中,Cr在镍镀层中的扩散系数约为9.18×10^(-13) cm^2/s。

A pure nickel coating was prepared on the surface of Incoloy-800 Halloy by electroplating technology,and its corrosion behavior in static high temperature chloride molten salt environment was studied.It was found that the pure nickel metal coating with good performance and strong adhesion could be obtained by electroplating in the nickel sulfamate plating solution.The nickel coating could protect element Cr from corrosion due to avoiding the direct contact between Cr and molten salt and effectively preventing the diffusion of element Cr,which effectively reduced the corrosion rate of the material.Applying Fick′s second law,it was concluded that the diffusion coefficient of Cr in the nickel coating was about 9.18×10^-13 cm^2/s in the chloride molten salt at 700℃.