Diagrams of Chemical and Electrochemical Stability of Thermal-Diffusion Zinc Coatings

摘要

Cutsets are calculated for the Zn-Fe-O system phase diagram at 700 and 298 K and the Zn-Fe-H_2O system potential-pH diagram at 298 K, 1 atm (air), and a_i = 10~(-6) mol/l with zinc excess (C_(Zn)~(al) > C_(Zn)~(cr)) or deficiency (C_(Zn)~(al) < C_(Zn)~(cr)) in the alloy surface layer of the Zn-Fe alloy. Thermodynamics of corrosion-electrochemical behavior of different phases in thermal-diffusion zinc coatings are discussed.