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首页> 外文期刊>International Journal of Electrochemical Science >Study of the Electrochemical Corrosion Behaviour of X70 Steel in H2SO4 Contaminated Silty Soil
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Study of the Electrochemical Corrosion Behaviour of X70 Steel in H2SO4 Contaminated Silty Soil

机译：X70钢在H 2 SO 4 污染粉质土壤中的电化学腐蚀行为研究

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In this paper, electrochemical impedance spectroscopy (EIS), polarization curves (PC), scanningelectron microscopy (SEM), and energy dispersive spectroscopy (EDS) were used to test theelectrochemical corrosion behaviour of X70 steel in contaminated silty soil with different pH valuesunder indoor simulation conditions. Four different pH values of contaminated silty soil (1.50, 3.78,5.03 and 7.07) were obtained through different concentrations of H2SO4 solution. The experimentalresults show that silty soil contaminated with H2SO4 solution accelerated the corrosion rate of X70steel. In addition, the corrosion rate increased with a decrease in the pH values of the contaminatedsilty soil. However, the corrosion rate decreased with an increase in corrosion time due to anaccumulation of corrosion products on the X70 steel surface. In weakly acidic contaminated silty soiland neutral silty soil (pH=7.07 and 5.03), the corrosion morphology and corrosion type of X70 steelare similar, i.e., a large number of silty soil particles and deep reddish-brown corrosion products (ironoxides) were evenly covered on the X70 steel sample. Additionally, the corrosion of the sample wasrelatively slight after removing the cover layer, and the corrosion pits were shallow and small andevenly distributed on the surface of the X70 steel. However, in strongly acidic (pH=1.50, 3.78)contaminated silty soil, the X70 steel was seriously corroded. Among the contaminated silty soil with apH of 3.78, a large amount of dark red-brown rust was generated on the X70 steel surface. Large-sizedcorrosion pits and grooves were evident after derusting. When the pH reached 1.50, two-thirds of thesurface of the X70 steel were covered by a layer of milky-yellow corrosion products (sulfur-containingcompounds), which protected it from corrosion. However, the area that was not significantly coveredwas seriously corroded, and a large number of deep and large pits appeared on the X70 steel surface.
机译：在室内模拟下，采用电化学阻抗谱（EIS），极化曲线（PC），扫描电子显微镜（SEM）和能量分散谱（EDS）来测试X70钢在不同pH值的粉质污染土壤中的电化学腐蚀行为。条件。通过不同浓度的H2SO4溶液获得了四个不同pH值的粉质污染土壤（1.50、3.78、5.03和7.07）。实验结果表明，被H2SO4溶液污染的粉质土壤加速了X70钢的腐蚀速度。另外，腐蚀速率随着被污染的粉质土壤的pH值的降低而增加。但是，由于腐蚀产物在X70钢表面的积累，腐蚀速率随腐蚀时间的增加而降低。在弱酸性污染的粉质土壤和中性粉质土壤（pH = 7.07和5.03）中，X70钢的腐蚀形态和腐蚀类型相似，即大量粉质土壤颗粒和深红棕色腐蚀产物（氧化铁）被均匀覆盖。在X70钢样品上。另外，去除覆盖层后样品的腐蚀相对较轻，并且腐蚀点浅而小，并且均匀分布在X70钢的表面上。然而，在强酸性（pH = 1.50，3.78）污染的粉质土壤中，X70钢被严重腐蚀。在pH为3.78的被污染的粉质土壤中，X70钢表面产生了大量的深红褐色铁锈。除锈后，明显出现了大型腐蚀坑和沟槽。当pH达到1.50时，X70钢表面的三分之二被一层乳黄色腐蚀产物（含硫化合物）覆盖，从而保护了它免受腐蚀。但是，未被充分覆盖的区域被严重腐蚀，并且X70钢表面上出现了大量的深坑和大坑。

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