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펌프의 부식 원인 분석과 처리 대처

2018-06-05View Original

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전电化学腐蚀是指由于金属间电极电位的差异,使得异类金属的接触表面形成电池,从而使阳极金属产生腐蚀的电化学过程。防止电化学腐蚀的措施,一是泵的流道最好采用相同的金属材料;二是采用牺牲阳极,对阴极金属进行保护。例如将小件的易损件用低电位金属制成,作为阳极,将大件的重要零件用高电位金属制成,作为阴极,阳极金属将先腐蚀;保护了阴极金属。均匀腐蚀均匀腐蚀指腐蚀性液体接触金属表面时,整个金属表面发生均匀的化学腐蚀。这是腐蚀型式中最常见的型式,同时也是危害最小的一种腐蚀型式。防止均匀腐蚀的措施是:采取合适的材料(包括非金属),在水泵设计时考虑足够的腐蚀裕量。晶间腐蚀晶间腐蚀是一种局部腐蚀,主要是指不锈钢晶粒之间析出碳化铬的现象。晶间腐蚀对不锈钢材料例如不锈钢潜水泵或者不锈钢自吸泵的腐蚀极为严重。发生晶间腐蚀的材料其强度及塑性几乎完全丧失。防止晶间腐蚀的措施是:对不锈钢进行退火处理,或采用超低碳不锈钢(C

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