The electrochemical potential noise (EPN) was used to check the weld zone of 304 and 316 stainless steel specimens in different states at room temperature in the 50% NaOH solution in order to deal with their different corrosion behaviors. The different-state specimens were made in the boiling 50% NaOH solution. Several EPN parameters were obtained from time domain and frequency domain analysis. The results show EPN of different corrosion states of weld specimens can be applied to ju dging whether local corrosion may occur. By using parameters of roll-off slope (K) and the frequency of events (fn) from PSDs, it is also likely to distinguish different states of specimens. Further devel opment is expected to be useful for real-time check of local corrosion.%利用电化学电位噪声方法检测了不同腐蚀状态304与316两种不镑钢管焊缝区试样在室温碱液中的腐蚀行为,并采用电化学噪声时域谱、频域谱进行了分析,结果表明:不同腐蚀状态焊缝试样的腐蚀电位及噪声时城谱特征不同,可利用电位噪声频城谱的高频斜率K值定性判定是否发生局部腐蚀,同时可根据频城谱中发生事件特殊频率fn区分材料的腐蚀状态,为现场检测奠定基础.
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