Abstract
The adhesion durability of the polyethylene coated steel which used as the base material the steel which added Cr 0-9% and SUS410, 430, 304 was investigated in immersion test and a neutral salt spray test (SST). The adhesion durability after 0.5M NaCl immersion at 60℃ improves as the amount of Cr increases. Although the delamination kinetics of the coating layer from the edge after a SST is also improved according to the increase in the amount of Cr, but this effect is saturated above 9% addition. It was suggested that it is related to the corrosion potential of bare steel that adhesion durability improves with the increase in the amount of Cr. It is thought that corrosion potential is shifted to noble by adding Cr is making small electrode potential difference between the steel surface under coating layer and bare steel area, and is considered to inhibit the cathode reaction under coating layer. However, the stainless steel must take into consideration that the influence of the crevice corrosion under coating delamination and adhesion loss area and SUS304 are inferior in adhesiveness.
