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对X80管线钢表面进行离子渗氮,研究其在酸性鹰潭土壤模拟溶液中的腐蚀行为。电化学和腐蚀失重实验的结果表明:浸泡相同时间,经离子渗氮的试样比X80钢更耐蚀,其腐蚀速率小于X80钢。离子渗氮处理使X80钢表面生成了ε相和γ’相,可显著提高腐蚀电位,使腐蚀反应更难发生;氮化物及钢中固溶氮原子,可显著降低自腐蚀电流密度,降低腐蚀反应速率。随浸泡时间的增加,经离子渗氮的试样表面的自腐蚀电流密度单调增加,源于表面腐蚀产物膜致密性差,易形成微孔和缝隙,加速腐蚀。
The surface of X80 pipeline steel was subjected to ion nitriding to study its corrosion behavior in acidic Yingtan soil simulation solution. Electrochemical and corrosion loss test results show that: the same immersion time, the sample by ion nitriding corrosion resistance than X80 steel, the corrosion rate is less than the X80 steel. Ion nitriding treatment makes the surface of X80 steel produce ε phase and γ ’phase, can significantly increase the corrosion potential, the corrosion reaction more difficult; nitride and steel solid solution of nitrogen atoms, can significantly reduce the self-corrosion current density and reduce corrosion reaction speed. With the increase of immersion time, the self-corrosion current density on the surface of the sample after ion nitriding increases monotonically, which is due to the poor film densification of the surface corrosion products, easy to form micropores and gaps, and accelerated corrosion.