A New Understanding on AC Corrosion of Pipeline Steel in Alkaline Environment
A New Understanding on AC Corrosion of Pipeline Steel in Alkaline Environment
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DOI：
10.1007/s11665-016-2416-6
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发表时间：
2016
影响因子：
2.3
通讯作者：
M. Zhu;C. Du
中科院分区：
文献类型：
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作者：
M. Zhu;C. Du
采用极化曲线、电化学阻抗谱、Mott-Schottky曲线和浸泡试验研究了X80管线钢在碳酸盐/碳酸氢盐溶液中不同交流频率下的腐蚀行为。对碱性环境中钢的交流腐蚀提出了新的认识。降低交流频率会使腐蚀电位负移，增加钢的腐蚀速率，并且更容易出现腐蚀坑。叠加的交流使临界点蚀电位负移，降低了钢的钝化性。AC降低了钢表面钝化膜的致密性和均匀性，增加了钝化膜破裂的可能性，同时也降低了钝化膜的厚度。交流电源的应用可以阻止X80钢表面钝化膜的形成，并对表面形成的钝化膜产生破坏作用，特别是在低频交流电源下。
In this work, the corrosion behavior of X80 pipeline steel at various frequencies AC was investigated in carbonate/bicarbonate solution using the polarization curve, EIS test, Mott-Schottky curve and immersion tests. A new understanding on AC corrosion of the steel in alkaline environment is proposed. Decreasing AC frequency negatively shifts the corrosion potential and increases the corrosion rate of steel, as well as corrosion pits occur more readily. The superimposed AC shifts the critical pitting potential negatively and degrades the passivity of the steel. AC reduces the compactness and uniformity of the passive film formed on the steel and increases the possibility of the breakdown of the film, as well decreases the film thickness. The application of AC could prevent the passive film forming on the surface of X80 steel and result in a destructive effect on the film formed on the steel surface, especially at the low-frequency AC.