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以矿用钢丝为研究对象,模拟典型矿井工况,分别对不同表面处理方式、不同浸泡介质下的钢丝进行全浸泡正交腐蚀试验,通过极化曲线与阻抗谱测量来研究不同钢丝的腐蚀机理,通过观察不同浸泡时间下钢丝的表面形貌及XRD分析来研究不同钢丝的腐蚀过程。结果表明:酸性介质下钢丝在浸泡中期便开始形成钝化膜,而碱性介质下钢丝直到浸泡后期才开始形成钝化膜,酸性介质比碱性介质更易使钢丝发生腐蚀,在2种腐蚀介质下未处理钢丝由于表面注油层对基体的有效保护,耐腐蚀性能优于裸钢丝;点蚀为钢丝腐蚀最常见的表现方式,不同表面处理方式、不同浸泡介质对于点蚀坑的形貌、产生时间及扩展方式具有重要的影响;长期浸泡后,所有钢丝试样表面外锈层主要成分为FeO(OH),内锈层主要成分为Fe3O4。
Taking the mining steel wire as the research object, this paper simulated the working conditions of the typical mine. The corrosion tests of the steel wire under different surface treatment methods and different immersion media were carried out. The corrosion mechanism of different steel wires was studied by polarization curve and impedance spectroscopy The corrosion process of different steel wires was studied by observing the surface morphology and XRD analysis of the steel wire under different immersion time. The results show that the steel wire begins to form a passive film in the medium of soaking medium, while the steel wire in alkaline medium does not start to form the passive film until the late stage of immersion. The acid medium is more likely to corrode the steel wire than the alkaline medium, Under the untreated wire due to the surface of the oil layer of the effective protection of the substrate, the corrosion resistance is better than bare steel; pitting wire corrosion is the most common manifestation of different surface treatment methods, different immersion media pitting pit morphology, resulting Time and mode of extension have an important influence. After long-term immersion, the main component of the outer rust layer on the surface of all the steel wires is FeO (OH) and the main component of the inner rust layer is Fe3O4.