2022 Volume 71 Issue 9 Pages 263-270
We researched the corrosion behavior and the corrosion resistance of hot-dip galvanized steel in saturated Ca（OH）2 aqueous solution containing chloride ion （Cl－） and in concrete. In saturated Ca（OH）2 aqueous solution, which simulated the water in the concrete pores, Ca（Zn（OH）3）2・2H2O was formed on the surface of hot-dip galvanized steel. The corrosion rate of Zn increased as the Cl－ concentration increased. Corrosion products; Zn5 （OH）8Cl2・H2O and CaCO3 were formed and the coverage of Ca（Zn（OH）3）2・2H2O decreased. On the other hands, in concrete, corrosion of hot dipped galvanized steel was not promoted by the cyclic corrosion test. It maybe because Cl－ penetrated into concrete did not reach the depth of galvanized steel and Ca（Zn（OH）3）2・2H2O formed during curing of concrete remained after the cyclic corrosion test
