22MnB5热冲压淬火零件的耐腐蚀性能

Corrosion Resistance of 22MnB5 Hot-Stamped and Quenched Parts

根据汽车用22MnB5零件的制造工艺,对无涂层板、Al-Si涂层板、热镀锌板进行热冲压淬火处理及无涂层板热冲压淬火后电镀锌处理。利用光学显微镜观察了热冲压淬火前后零件涂层的形貌变化。通过中性盐雾试验研究了不同工艺处理零件的耐腐蚀性能。结果表明:对热压冲淬火后零件进行电镀锌处理,得到的涂层致密均匀没有破损,且具有极好的阴极保护效果,该零件的耐腐蚀性能远优于Al-Si涂层板、热镀锌板和无涂层板的;热压冲淬火后电镀锌处理可以提高汽车零件的耐腐蚀性能。

According to the manufacturing process of 22 MnB5 parts for automobiles, uncoated steel sheet, Al-Si coated steel sheet and hot galvanized steel sheet were treated by hot-stamping and quenching, and the uncoated steel sheet was galvanized after hot-stamping and quenching. The changes in the morphology of the part coating before and after hot-stamping and quenching were observed by optical microscope. The corrosion resistance of parts treated by different processes was studied by neutral salt-spray test. The coating obtained by galvanization after hot-stamping and quenching on a part was dense and uniform without damage, and had excellent cathodic protection effect. The corrosion resistance of the part was far superior to that of Al-Si coated steel sheet, hot galvanized steel sheet and uncoated plate. Galvanization after hot-stamping and quenching can improve the corrosion resistance of automobile parts.