化学镀镍磷合金镀层孔隙率的电化学评价

本文通过研究镍磷合金、镍磷合金镀层和碳钢在不同浓度硝酸溶液中的动电位极化曲线，选择了能够快速检测镍磷合金镀层孔隙率的硝酸浓度，并对不同厚度的镍磷合金镀层试样进行评价，结果表明：镍磷合金镀层在１０％到溶液中的动电位极化曲线能地反映镀层的孔隙率，该硝酸溶液最适合作为应用电化学方法检测镀层孔隙率的检测溶液，其变化规律是随着镀层孔隙率的减少，镀层的体育馆２电位逐渐正移，应用常规的孔隙率检测方法只能检测较大

Electrochemical Evaluation on the Porosity of Electroless Ni-P Alloy Coatings

By investigating the polarization curves of pure Ni P alloy,Ni P alloy coation and carbon steel in nitric acids with different concentrations,the sutable concentration of nitric acid for the evaluation of the porosity of Ni P alloy coatings has been determined and the coatings with different thickness have been evaluated.The results indicated that the nitric acid with 10 wt% concentration is the most suitable solution for the porosity of the coating by using electrochemical method.The polarization curve of Ni P alloy coating in 10% nitric acid can accurately reveal the porosity.With the decrease of the porosity of the coating,the corrosion potential of the coating shifted towards positive direction.Then the ordinary detecion method can only be used in detecting the coating with bigger pores.