Electrochemical measurements, immersion tests, and surface analysis technology were used to study the effects that alternating current (AC) has on the corrosion behavior of X100 pipeline steel in simulated alkaline and acidic soil solutions. In the both simulated soil solutions, the AC corrosion rates of X100 pipeline steel increased with an increase in the applied AC current density, but the increase in the rate of corrosion rates gradually decreased. The AC corrosion rate in the simulated acidic soil solution was higher than that in the simulated alkaline soil solution under the same AC current density. The direct current (DC) potential of X100 pipeline steel in the presence of AC current had a negative shift with respect to the natural potential. The real-time potential oscillated sinusoidally at the same frequency as the applied AC current, and the oscillation amplitude increased with an increase in AC current density. The AC corrosion products of X100 pipeline steel in the simulated acidic soil solution were less protective to the metal matrix than those in the simulated alkaline soil solution. For AC current densities greater than 100 A/m2 in simulated alkaline soli solution and 200A/m2 in simulated acidic soil solutions, localized corrosion occurred, whereas general corrosion occurred under lower AC current densities.
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机译：电化学测量，浸泡试验和表面分析技术被用来研究的是交流电（AC）对X100管线钢在模拟的碱性和酸性土壤溶液中的腐蚀行为的影响。在这两种模拟土壤的解决方案，X100管线钢的AC腐蚀速率的增加所施加的交流电流密度增加，但腐蚀速率率的增加而逐渐下降。在模拟的酸性土溶液中的AC腐蚀率明显高于在相同的交流电流密度下的模拟碱性土壤溶液更高。在交流电流的存在X100管线钢的直流（DC）电势必须相对于自然电位的负偏移。实时电位在相同的频率作为所施加的交流电流正弦振荡，振荡的振幅随着在AC电流密度增加。在模拟酸性土壤溶液X100管线钢的AC腐蚀产物以比在模拟碱性土壤溶液中的金属基体更小的保护。对于交流电流密度大于100 A /平方米在模拟碱性索利溶液和在模拟酸性土溶液200A / m2时，局部腐蚀发生，而在较低的AC电流密度发生全面腐蚀。
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