Corrosion properties of Cu-containing heat resistant austenitic steel

Title
Corrosion properties of Cu-containing heat resistant austenitic steel
Authors
홍성민권오집에릭플러리
Keywords
Heat resistant austenitic steel; Cu; electrochemical test; OCP; polarization; passivation behavior
Issue Date
2009-05
Publisher
Asia steel
Citation
, 1-7
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/35435
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KIST Publication > Conference Paper
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