摘要
文章研究了冷轧板、镀锌板、铝板及其在电泳后的汽车车身通用金属材料缝隙在中性盐雾环境中的腐蚀行为,并分析了宏观腐蚀形貌,采用扫描电子显微镜、能谱仪等微观分析手段表征了腐蚀形貌和成分。结果表明,在同一腐蚀环境中,上述通用金属材料缝隙处更容易产生腐蚀,尤其冷轧板缝隙腐蚀程度最严重,产生了大量的Fe_(3)O_(4)和Fe_(2)O_(3),呈现出较差的耐蚀性;镀锌板缝隙腐蚀面的氧含量较高,产生了较多的Fe_(2)O_(3);铝板缝隙表面的氧含量最低,产生了少量的Al_(2)O_(3),呈现出较好的耐蚀性;电泳后的材料缝隙处的耐蚀性得到了明显的改善。最后,根据汽车结构工艺要求及上述金属缝隙处的腐蚀状况,得出汽车车身、发动机舱、底盘等区域选择缝隙搭载材料的推荐性结论。
The corrosion behaviors of cold rolled sheet,galvanized sheet,aluminum sheet and their electrophoretic crevices in the neutral salt fog environment were studied,their macroscopic corrosion morphology was analyzed,and the corrosion morphology and composition were characterized by scanning electron microscope,energy disperse spectroscopy and other microscopic analysis methods.The results show that in the same corrosion environment,the crevices of the above universal metal materials are more prone to corrosion,especially the crevices of the cold rolled plate are the most serious,which produce a large amount of Fe_(3)O_(4) and Fe_(2)O_(3),showing poor corrosion resistance.The oxygen content of the crevice corrosive surface of galvanized sheet is higher,and more Fe_(2)O_(3)is produced,while the oxygen content of the crevice corrosive surface of aluminum plate is the lowest,and a small amount of Al_(2)O_(3)is produced,showing good corrosion resistance.The corrosion resistance of the crevice of the electrophoretic material was improved obviously.Finally,according to the technical requirements of automobile structure and the corrosion status of the above-mentioned metal crevices,the recommended conclusions for selecting crevice materials in automobile body,engine compartment,chassis and other areas are given.
作者
陈伟
郭晓亮
沈玥
张志超
张路杨
CHEN Wei;GUO Xiaoliang;SHEN Yue;ZHANG Zhichao;ZHANG Luyang(CATARC Automotive Test Center(Hulunbuir)Company Limited,Hulunbuir 021000,China;CATARC Automotive Proving Ground Company Limited,Yancheng 224100,China)
出处
《汽车实用技术》
2022年第9期116-120,共5页
Automobile Applied Technology
关键词
汽车金属材料缝隙
腐蚀行为
中性盐雾环境
Automobile metal material crevice
Corrosion behavior
Neutral salt fog environment
