Abstract
This study examined corrosion characteristics and durability of painted steels with different surface preparations of steel substrates through accelerated exposure tests. Steel plates were fabricated with structural steels for twelve specimens and weathering steel plates for twelve specimens conforming to JIS SM490A and SMA490AW, respectively. Nine of the twelve plates in each group were pre-corroded in the accelerated exposure test equipment for S6-120 cycles (30 days), and then the surface treatment of the pre-corroded specimens was conducted by a grinder in three ways, i. e. complete rust removal, slight rust removal, and no rust removal in each for three corroded specimens. Non-corroded steel plates were grit-blasted before coating. Based on C-3 or C-4 painting systems, the coating of all the plates was performed. The accelerated exposure tests of the painted specimens were continued for S6-1000 cycles (251 days). From the test results, the effect of different surface preparations degree on corrosion deterioration of the painted steels was clarified.
