通过改变次磷酸盐体系的工艺参数制得不同的镍磷合金镀层.采用电化学阻抗谱技术(简称EIS技术)和动电位扫描极化曲线技术,研究了不同工艺参数时镍磷镀层在0.5 mol/L NaCl中性介质中的耐蚀性规律和耐蚀机理.结果表明:电镀镍磷合金镀层耐蚀性随镀液pH值的降低而升高,并随镀液中次磷酸盐浓度的升高而升高,并在次磷酸盐浓度为110 g/L时到最大值;而继续增大次磷酸盐浓度镀层的耐蚀性又降低;低温(40℃)制得的镀层比高温(60℃)下制得的镀层更耐蚀.
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