Ni-W-P-SiC脉冲复合镀层的腐蚀形貌研究

CORROSION MORPHOLOGY OF Ni-W-P-SiC PULSE COMPOSITE COATING

在四种腐蚀溶液中对Ni-W-P-SiC脉冲复合镀层进行浸泡试验,利用光学显微镜对镀层腐蚀后的表面形貌进行了分析。9天的浸泡试验结果表明,经400℃热处理的镀层在各种腐蚀介质中腐蚀后的表面形貌变化比镀态镀层小;镀层在HCl溶液中的腐蚀属于点蚀,在H2SO4、H3PO4和FeCl3溶液中的腐蚀属于缝隙腐蚀。

The morphology ofNi-W-P-SiC pulse composite coatings after corrosion was examined by optical microscopy. The corrosion degree of coatings after 400℃ heat treatment in all corrosion solutions was less than that of the deposited coatings in as deposited state. The coating corrosion was pitting corrosion in HCl solution and crevice corrosion in H2 SO4, H3 PO4 and FeCl3 solutions.