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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 1 0 %硝酸溶液中的动电位极化曲线能准确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 ,镀层的腐蚀电位逐渐正移 .应用常规的孔隙率检测方法只能检测较大的孔隙 .
In this paper, the potentiodynamic polarization curve of nickel-phosphorus alloy, nickel-phosphorus alloy coating and carbon steel in nitric acid solution with different concentrations was studied. The concentration of nitric acid which can quickly detect the porosity of nickel-phosphorus alloy coating was selected. The results show that the potentiodynamic polarization curve of nickel-phosphorus alloy coating in 10% nitric acid solution can accurately reflect the porosity of the coating layer, and the nitric acid solution is the most suitable for electrochemical detection of the porosity of the coating Detection of the solution, the variation is with the reduction of the coating porosity, corrosion potential of the coating gradually positive.Application of conventional porosity detection method can only detect larger pores.