In-sity Monitoring of Micro-Cracking of Ni-Based Alloys at High Temperature Using Electrochemical Noise Technique

摘要

This work is aimed to establish in-situ technique to monitor stress corrosion cracking of nickel-based alloys in a micro-scale at high temperature using an electrochemical noise analysis based on a stochastic theory. The electrochemical current noise was measured from Alloy 600 steam generator tubing. The amplitude and frequency in time domain, the power spectral density in frequency domain, and the mean time-to-failure were analyzed in terms of the micro-cracking and the crack growth of nickel-based alloys at high temperature.