含硫介质中化学镀Ni-P合金镀层耐蚀性研究

用场发射扫描电子显微镜、X射线光电子能谱仪及X射线衍射仪分析Ni-P合金镀层表面的形貌、组成及结构,用恒电位极化曲线法研究了Ni-P合金镀层在Na2S溶液中的腐蚀行为,通过重量法测试了Ni-P合金镀层在不同温度、不同质量分数Na2S溶液中的腐蚀速率.结果表明:Ni-P合金镀层为非晶态镀层,表面具有胞状结构;在Na2S质量分数一定的条件下,Ni-P合金镀层腐蚀的阳极过程随着温度的升高,钝化区域逐渐变窄.

CORROSION RESISTANCE OF ELECTROLESS PLATING Ni-P ALLOY COATING IN SULFUR-BEARING SOLUTION

Surface morphologies, ingredients and structure of electroless plating Ni- P alloy coatings were investigated using field emission scanning electron microscope, X - ray photoelectron spectrometer and X - ray diffraction instrument, the corrosion behavior of Ni - P alloy coatings in Na2S solution was studied by potentiostatic polarization method and the corrosion rate of Ni - P alloy coatings was measured in different concentration of Na2S solutions at different temperatures by gravimetric method. Experiment results indicate that the amorphous Ni - P plating is deposited with cellular structure on the surface. In the same concentration of Na2S solution, the passivation area of the anodic process of corrosion reaction of the Ni - P alloy coatings narrowed gradually with increasing temperature.