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通过干湿交替腐蚀实验研究了海洋平台用低碳中锰钢在海洋环境下飞溅区的海水腐蚀行为.通过电子显微镜研究了腐蚀产物的形貌特征,利用电子探针(EPMA)表征了锈层的截面形貌及腐蚀产物中元素的分布,采用X射线衍射仪对腐蚀产物进行了物相分析.结果表明:随着腐蚀时间的延长,腐蚀速率先是快速增加,达到峰值后下降,最后趋于稳定.腐蚀产物结构由疏松多孔状逐渐转化为致密厚实状,锈层对基体的保护能力逐渐增强.在高浓度氯离子环境下,腐蚀产物以γ-Fe OOH为主,并出现了锰的氧化物和铁锰氧化物两种物相,它们促进了腐蚀过程中的电化学反应.
The corrosion behavior of seawater in splash zone of marine platform using low carbon medium manganese steel was studied by alternating wet and dry corrosion experiments.The morphology of the corrosion products was studied by electron microscopy and the rust layer And the distribution of the elements in the corrosion products.The phase analysis of the corrosion products was carried out by X-ray diffraction.The results showed that with the extension of the corrosion time, the corrosion rate firstly increased rapidly and then peaked and then decreased, The structure of corrosion products gradually transformed from loose porous to dense and solid, and the protective ability of the rust layer on the matrix gradually increased.Under high chloride environment, the corrosion products were dominated by γ-Fe OOH and the oxidation of manganese appeared Two phases, iron and manganese oxide, promote the electrochemical reaction during the corrosion process.