The influence of water quality factors such as silica (SiO2) and chloride ion (Cl-) on a stability index of water and a corrosion rate of steel was investigated by corrosion weight loss tests and analyses of numerical values. SiO2 had an ability of corrosion inhibition, and then, tended to change the stability index at chemical equilibrium state. The stability index and corrosion rate were not affected by Cl- in solution with SiO2.
