Abstract
An acrylic-urethane coating material is widely used as paint over Cr plating. Though the peeling of the coating film that occurs shortly after the painting becomes a problem, the cause of the peeling is not clear. The effects on the adhesive strength of the coating material were clarified for both the dirt in the plating process and the storage environment (temperature, humidity) of the Cr plating material before the coating was done. The adhesive strength of the coating material decreases when the plating process dirt remains on the Cr plating surface and the storage environment is at high temperature and high humidity. The ratio of Cr2O3 increases on Cr plating material in which the adhesive strength of the coating material decreases due to high temperature and high humidity. It was proven that the adhesive strength is improved by using an organic silicon compound for Cr plating material in which the adhesive strength of the coating material was lowered. The adhesive strength was slightly improved by adding an organic silicon compound to the acrylic-urethane coating material and using the pre-coating organic silicon compound for the Cr plating material. The adhesive strength of the coating film for the Cr plating material was remarkably improved by using the silicon-acrylic coating material.
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