X80管线钢在新洲土壤中腐蚀的电化学噪声

采用电化学工作站测试了X80管线钢在不同含水率的新洲土壤中的电化学噪声,并对噪声数据进行了谱图和频域分析。结果表明:含水率对X80管线钢在新洲土壤中的腐蚀影响较大,在低含水率(14%)和中间含水率(18%)新洲土壤中,腐蚀以点蚀为主,在高含水率(22%)土壤中以均匀腐蚀为主;随着含水率从14%增加到22%,电化学噪声谱的噪声波动持续的时间缩短;X80管线钢发生均匀腐蚀时,其功率谱密度(PSD)图高频线性段斜率较大,与腐蚀初期相比变化较大,且出现高频白噪声;当X80管线钢发生点蚀时,其PSD图高频线性段斜率较小,与腐蚀初期相比变化不大。

Electrochemical Noise of Corrosion of X80 Pipeline Steel in Xinzhou Soil Environment

The electrochemical noise of X80 pipeline steel in Xinzhou soil with different water content was tested by electrochemical workstation,and noise figure and frequency domain were analyzed according to tested noise data.The results show that water content had great effect on the corrosion of X80 pipeline steel in Xinzhou soil.Pitting dominated the corrosion process in Xinzhou soil with low (14 ％) and middle (18 ％) water content;uniform corrosion dominated the corrosion process in Xinzhou soil with high water content (22％).The duration of noise fluctuation in electrochemical noise spectra shortened when the water content increased from 14％ to 22％.The slope of highfrequency linear segment in the potential PSD (power spectrum density) was large,which changed a lot compared with that in the beginning of corrosion,when uniform corrosion happened in the X80 pipeline steel.And the highfrequency white noise appeared.The slope of high-frequency linear segment in the potential PSD was small,which had little change compared with that in the beginning of corrosion,when pitting happened in the X80 pipeline steel.