Abstract
It is important for those concerned with zinc to know what corrosion form of zinc takes in various environments. A pCl-pH diagram for Zn-Cl--H2O system is usually used as an index of corrosion form of zinc in an arbitrary chloride environment.
In this report, the mistake of Zn-Cl--H2O system pCl-pH diagram which had been widely used after 1950's was pointed out and revised. The drawing method which used the solubility product of the corrosion products of zinc in this was shown.
