| 摘要 |
PROBLEM TO BE SOLVED: To provide a corrosion resistance evaluation method of surface treated metal with high correlativity to corrosion of an actual automotive door material. SOLUTION: At least one type of processes of bulging, draw bead processing and plane sliding is applied to the surface treated metal, and a steel plate clad section is formed by laminating different or the same type of surface treated metal after applying the above processes. Then, the corrosion resistance is evaluated using the steel plate forming the steel plate clad section as a test piece in corrosion environment. The steel plate clad section is preferably formed by joining the different or the same type of surface treated metal with resistance welding. It is also preferable that the corrosion resistance be evaluated in corrosion environment to a test piece, which is chemically converted and electrodeposited after forming the steel plate clad section so as to simulate more actual automobile structure. A corrosion test can be done at SAE J2334 120 cycles, for example. COPYRIGHT: (C)2009,JPO&INPIT
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