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车体为什么发生腐蚀,可以举出某一特定部位加以说明。旧型车外墙板与底架的搭接部分,由于锈蚀,使外墙板鼓起。因为这部分是涂上防腐涂料后又用点焊或塞焊焊接起来的,涂料被焊接热烧伤起泡,水和氧气由外墙板与底架搭接部分的间隙处渗入剥离的涂料上,从而形成局部电池(两金属体与电解溶液的组合),造成金属熔解生锈(参见图1)。防腐措施可以提出好多方法。例如:采取完全密封方法,使水等不能渗入;采用不能构成局部电池的结构;采用耐腐蚀材料
Why the body corroded, you can cite a specific part of the description. Old car wall panels and chassis lap part, due to corrosion, make the outer wall bulge. Because this part is coated with anti-corrosion coating and then welding or welding with spot welding, paint is burned by the heat burning bubbles, water and oxygen from the outer wall plate and chassis overlap part of the gap infiltration of peeled paint, Thus, a local cell (a combination of two metal bodies and an electrolytic solution) is formed, causing the metal to melt and rust (see FIG. 1). Anticorrosion measures can suggest many ways. For example: take a completely sealed method, so that water can not infiltrate; the use of local batteries can not form the structure; the use of corrosion-resistant materials