Abstract
The embrittlement of CrMoV steel used for a steam turbine rotor, which had been in service over 139,000 h, has been investigated by open circuit potential measurements in acidic aqueous solutions of various organic compounds. The open circuit potential shifted positively in nitrophenol and nitrobenzoic acid solutions as the embrittlement level of the CrMoV steel increased, while it shifted negatively in aliphatic and aromatic acids without the nitro group. The possibility for embrittlement evaluation was also demonstrated by obtaining the rate of change in open circuit potential when solution stirring was stopped. The mechanism for the open circuit potential shift is discussed based on polarization measurements.
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