Abstract-Currently, a very popular method to reduce the corrosion on zinc is to use chemical conversion coating layers based on Cr +6 . However, certain issues must be overcome to use chromium salts due to restrictions resulting from legislation targeting environmental protection. This study investigates the optimum conditions to form high-strength steel sheets (SPFC780) using an organic/inorganic solution containing Si. The curing duration for the coating solution was of 1, 2 and 3 minutes at a temperature of 463 K. Seven types of coating solution were used, and the corrosion resistance improved as the heat treatment time increased. The optimal coating solution was the urethane of 21 wt.%, the SiO 2 polysilicate of 7 wt.% and the melamine of 3 wt.%.
Abstract. This study was conducted to investigate the pitting resistance due to degradation of stainless steel (STS310S, STS316L and STS347H). The three types of non-heat treated specimens did not exhibit pitting regardless of whether or not a coating had been applied. In an acidic solution, the non-coated specimen and the OIBD-2 coated specimen of degraded stainless steel had pitting, but the OIBD-1 coated specimen did not have it at all. In an alkaline solution, all of the degraded specimens did not exhibit pitting at all.
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