稀土改性Ni-P-PTFE复合镀层的腐蚀电化学行为

Electrochemical Corrosion Behavior of Rare Earth Modified Ni-P-PTFE Composite Coating

通过电沉积方法在铜基体上制备了稀土改性Ni-P-PTFE复合镀层。SEM测试镀层表面形貌平整光滑、结构致密,PTFE微粒分散均匀。采用阳极极化曲线(Tafel曲线)和电化学阻抗谱研究了Ni-P合金镀层,Ni-P-PTFE和改性Ni-P-PTFE复合镀层在不同介质条件下的腐蚀电化学行为。结果表明,在10%盐酸溶液中,改性Ni-P-PTFE复合镀层相对于Ni-P合金镀层和Ni-P-PTFE复合镀层,自腐蚀电位分别提高了316和84 mV,自腐蚀电流密度分别降低了1~2个数量级,镀层阻抗分别增加了7倍和4倍;在10%NaOH溶液中,自腐蚀电位分别提高了330和40 mV,自腐蚀电流密度分别降低了1~2个数量级,镀层阻抗分别增加了3倍和2倍。说明稀土改性的Ni-P-PTFE复合镀层在酸性和碱性条件下均表现出了更加优异的耐腐蚀性能。

The rare earth modified Ni-P-PTFE composite coatings were prepared on copper substrate by composite electroplating.SEM images revealed that the modified composite coating had a flat and smooth surface and compact structure with the PTFE particle uniformly dispersed in it.The corrosion electrochemical behavior of the Ni-P alloy coating,Ni-P-PTFE composite coating and modified Ni-P-PTFE composite coating in different media were investigated by means of anodic polarization curves(Tafel curves) and electrochemi...