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首页> 外文期刊>International Journal of Electrochemical Science >Corrosion Behaviors of Q235 Steel in Indoor Soil
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Corrosion Behaviors of Q235 Steel in Indoor Soil

机译：Q235钢在室内土壤中的腐蚀行为

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摘要

The corrosion behaviors of Q235 steel coupons were investigated via immersion and in-situ volumetriccurve in soils with various moistures. The volumetric curves showed that the corrosion process ofsteel in the soils was a combination of activation and diffusion control. The cathodic part of thepolarization curve obeyed Tafel law. Its extrapolation to the corrosion potentials gave theinstantaneous corrosion rates much bigger than the average corrosion rate from mass loss.Nevertheless, both of the average and the instantaneous corrosion rates not only showed moisture hadsignificant effect on soil corrosion of Q235 steel but the biggest was in 26% moisture soil being ca.1.5 of the corrosion rate in the 12% moisture soil. The average corrosion rates for 7 days exposurewere bigger than 21 days, owing to more corrosion products accumulating on the surface andhindering mass transfer at longer exposure than at initial immersion. Maximum pit depth grew fastand pit-covered length in per millimeter on the surface of the coupons (Lpit) slow during the first twoexposure durations, and they were reversed during the third exposure duration.
机译：通过浸没和原位体积曲线在各种湿度的土壤中研究了Q235钢试样的腐蚀行为。体积曲线表明，钢在土壤中的腐蚀过程是活化和扩散控制的结合。极化曲线的阴极部分服从塔菲尔定律。通过对腐蚀电位的推算得出，瞬时腐蚀速率远大于质量损失造成的平均腐蚀速率。但是，平均腐蚀速率和瞬时腐蚀速率不仅显示出水分对Q235钢的土壤腐蚀有显着影响，而且最大的腐蚀发生在26。湿土百分比为12％湿土腐蚀速率的1.5倍左右。暴露7天的平均腐蚀速率大于21天，这是由于与最初浸没相比，暴露在表面的腐蚀产物更多，并且在更长的暴露时间内阻碍了传质。在前两次曝光期间，最大凹坑深度增长很快，而试样块表面（Lpit）上每毫米的凹坑覆盖长度变慢，而在第三次曝光期间它们反转了。

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