Corrosion properties of Cu-containing heat resistant austenitic steel
- Corrosion properties of Cu-containing heat resistant austenitic steel
- 홍성민; 권오집; 에릭플러리
- Heat resistant austenitic steel; Cu; electrochemical test; OCP; polarization; passivation behavior
- Issue Date
- Asia steel
- , 1-7
- The corrosion behavior of heat resistant austenitic steels containing a low concentration of Cu was investigated in various aqueous media from acid to alkali solutions. Electrochemical tests were performed on solution treated as well as annealed steels containing up to 5 wt.% Cu in solution with pH values varying from 0 to 14. In solution treated conditions, the effect of Cu was moderate however when varying from 1 to 5 at.%, the Cu addition tended to enhance the corrosion resistance of the steels when tested in acidic solution, while the effect was the opposite in alkali solution. The effect of Cu was more significant for annealed specimens. Although the cathodic behavior was identical, the passivation current density of the annealed specimen was found to be up to 30 times higher than that of the solution treated specimens. The effect of Cu was attributed to the formation of precipitates in the austenitic matrix that modified the formation of continuous and protective oxide layers.
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