Abstract:
Stress corrosion cracking (SCC) is one of the main corrosion failure modes of mechanical engineering materials. Techniques of SCC testing, electrochemical measurement and Auger electron spectroscopy (AES) analysis have been used to study SCC of 304 stainless steel (SS) in high temperature water and alloy 800 in hot caustic solution. The SCC susceptible potentials correspond to passive-transpassive (active) transition. Electrochemical polarization measurements of the alloys and pure metals are able to provide useful information on the correlation of activation-passivation
of alloy to electrochemical behaviors of the main alloying
elements in Fe-Cr-Ni alloys, which is also in good agreement
with the results of surface film analyses. It is concluded that combination of SCC tests, polarization curves and AES analyses is in-formative for better understanding the SCC mechanism of Fe-Cr-Ni alloys.
Key words:
Stress corrosion cracking (SCC) Electrochemical measurement Auger electron spectroscopy (AES) Fe-Cr-Ni alloy
* This project is supported by Special Foundation for Major State Basic Project (No.G19990650).
Selected from Proceedings of 2000 the First International Conference on
Mechanical Engineering. revised manuscript September 12, 2001
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