基于电化学噪声技术的碳钢大气腐蚀行为监测方法

Monitoring Method of Carbon Steel Atmosphere Corrosion Behavior Based on Electrochemical Noise Technology

目的基于电化学噪声技术搭建了Q235碳钢腐蚀行为监测系统,对海洋大气环境下Q235碳钢的腐蚀过程进行监测。方法采用时域谱图、频域谱图方法对采集的电化学噪声数据进行分析。结果 0.5~2.0 h(晴天),电流噪声幅值较小,时域谱图出现少数暂态峰,频域谱图无白噪声区,电极处于钝化期;46~47.5 h(降雨),电流噪声波动变大,谱图出现大量暂态峰,PSD的斜率快速下降,电极表面出现蚀点,电极处于稳态点蚀期。结论该监测系统很好地实现了对海洋大气下Q235碳钢腐蚀行为的连续监测。

Objective Based on electrochemical noise technology,the corrosion behavior monitoring system of Q235carbon steel was constructed to monitor the corrosion process of Q235carbon steel in the marine atmosphere.MethodsThe electrochemical noise data collected was analyzed by time-domain spectrogram and frequency domain spectrogram.Results In the stage of0.5h-2.0h(sunny),the current noise amplitude was small;the time-domain spectra appeared a fewtransient peaks;white noise didn’t appear on frequency spectra;the electrode was in state of passivation;from46h to47.5h(rainy),the current fluctuated and the noise spectra appeared a large number of transient peaks;the slope of thePSD declined fast;the electrode surface was eroded;the electrode was in the steady pitting corrosion period.ConclusionThe monitoring system could continuously monitor corrosion behaviors of Q235carbon steel in the marine atmosphere.