Abstract
Sn-bearing steel containing a small amount of tin (Sn) was newly developed by noting the effect of adding such kind of trace alloy element for improving the corrosion resistance of steel. In order to investigate the corrosion deterioration characteristics around paint-coat defect of the coated Sn-bearing steel, accelerated exposure test was performed. During the test, the appearance and surface shape of paint coated Sn-bearing steel were examined for evaluating the degree of deterioration. The corrosion deterioration was evaluated by focusing on the blister of paint coating around the initial defect scribed in X shape. After the test, the corroded volumes of specimens were examined. The blister areas from the cross scribe paint defect of the Sn-bearing steel was respectively 90% in A-type coating and 50% in C-type coating of those of the SM490 steel at 2400 cycles. The corroded volumes from the cross scribe paint defect of the Sn-bearing steel were respectively 80% in A-type coating and 60% in C-type coating of those of the SM490 steel after the test.
