2022 Volume 71 Issue 1 Pages 21-29
By increasing oxygen （partial） pressure （O2 pressure） supplied to saturated Ca（OH）2 solution, formation of calcium hydroxy zincate （Ca（Zn（OH）3）2・2H2O, CHZ） which improves the corrosion resistance of zinc was accelerated and the density of the CHZ layer increased. An oxygen reduction reaction, which is the rate-limiting process of the CHZ formation, was enhanced with the increase in the supplied O2 pressure. The higher the O2 pressure supplied to the saturated Ca（OH）2 solution, the shorter the period for the improvement of corrosion resistance of zinc. This is because the accelerated formation of insulating CHZ rapidly reduced the exposed metal surface of zinc.
