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Polarization Resistance Measurement in Tap Water: The Influence of Rust Electrochemical Activity

机译:自来水中的偏振电阻测量:铁锈电化学活性的影响

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Corrosion rate of mild steel in tap water during 4300 h was estimated by LPR and weight-loss methods coupled with OCP measurements. The LPR results were found to be overestimated compared to the weight-loss data within initial 2000 h of exposure. The electrochemical activity of the rust separated from the metal surface was studied by cycling voltammetry using a home-built powder graphite electrode. High redox currents corresponding to the initial 2000 h of exposure were detected. Rust composition was characterized with IR and XRD, and the highest amounts of electrochemically active beta- and gamma-FeOOH were again detected for the initial 2000 h. Current consumption in rust transformation processes during LPR measurement in the galvanostatic mode accounts for overestimation of the corrosion rate. The time dependence of rust electrochemical activity correlates with OCP variation with time. During initial 2000 h, OCP values are shifted by 50 mV to cathodic side. For the period of a higher rust electrochemical activity, the use of a reduced B is suggested to increase accuracy of LPR technique in tap water.
机译:通过LPR和减肥方法估计了4300小时温度钢在自来水中的腐蚀速率,并与OCP测量相结合。发现LPR结果与曝光初始2000小时内的减肥数据相比过多定期。通过使用自制粉末石墨电极循环伏安法研究了与金属表面分离的锈的电化学活性。检测到对应于暴露的初始2000小时的高氧化还原电流。用IR和XRD表征锈组合物,并且再次检测到最高量的电化学活性β-和γ-FeOh以初始2000小时。在GALVANOTATIC模式下LPR测量期间锈蚀过程中的锈蚀过程中的电流消耗占腐蚀速率的高估。锈电化学活性的时间依赖性与OCP变异随时间相关的相关性。在初始2000小时期间,OCP值将50 mV移至阴极侧。对于较高的锈米电化学活性的时期,建议使用减少的B.提高自来水中LPR技术的准确性。

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