Electrochemical Characteristics of High Chromium Cast Iron in Different Structural States as a Factor of Quality Estimation of the Hot Rolling Mill Rolls Working Layer

High-chromium cast iron is used for rolling mill rolls production. A better knowledge of electrochemical corrosion destruction mechanisms of this material could be useful for a better appreciation of its service behavior and lifetime. The experimental specimens of high-chromium cast iron in different structural states were tested by potentiodynamic method. Propensity of investigated alloy to the destruction caused by corrosion active environments was shown. Peculiarities of electrochemical dissolution of investigated iron were studied. The influence of structural changes of high chromium iron that occur during preliminary high temperature exposure was analyzed. It may be recommended to take into account electrochemical properties of materials hot rolling mill rolls as an additional criterion of quality.