Corrosion of the vehicles used in north America - anti corrosion performance of galvanizinged steel sheet at several parts of vehicle

摘要

Five passenger vehicles used around Detroit area were submitted for corrosion investigation, which were manufactured in 1989 and 1991. Panels forming the body shell have been classified into five categories with respect to the corrosion environment, and were evaluated their cosmetic corrosion and perforation corrosion. It is confirmed that exterior panels made of two-side zinc coated steel sheet has excellent performance in cosmetic corrosion, and its shown that the corrosion depth at lapped parts under low humid condition decreases with increasing zinc coating weight. For precoated panels with zinc coating more than 45g/m{sup}2, the degree of corrosion was little.