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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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co2腐蚀产物膜的微观形貌和结构特征
Keywords: 材料失效与保护,co2腐蚀,低cr钢,腐蚀产物膜
Abstract:
？研究了碳钢、低cr钢在不同条件下形成co2腐蚀产物膜的微观形貌、成分和结构特征.结果表明,n80(碳钢)、1cr-l80形成的腐蚀产物膜主要由feco3晶体堆垛而成,而3cr-l80、5cr-l80的表层则形成大面积的含cr化合物,主要为cr(oh)3和cr2o3.这些cr的化合物脱水后比较疏松,容易形成龟裂.在静态条件下,碳钢和含cr钢的腐蚀产物膜均具有分层结构,碳钢外层与内层腐蚀产物膜的成分变化不大,主要为fe、ca碳酸复盐.含cr钢的内层腐蚀产物膜中出现cr元素的富集,外层主要为fe、ca碳酸复盐.随着cr含量的增加,材料的腐蚀产物膜向非晶态转变.在静态条件下,低cr钢比碳钢的腐蚀速率稍大;在动态(1.5m/s)条件下,含cr钢的腐蚀速率明显低于碳钢,而且腐蚀速率随着cr含量的增加而下降.
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