耐候钢表面氧化皮的结构特征及其对大气腐蚀行为的影响

发布时间：2018-05-30 03:13

  本文选题：耐候钢 + 氧化皮　； 参考：《金属学报》2017年02期

【摘要】：采用XRD、电化学测量和扫描电子显微术研究了耐候钢在400~700℃不同时间、不同氧流量条件下形成的氧化皮的结构及其对随后的大气腐蚀行为的影响,发现氧化皮的主要组成为Fe3O4和Fe2O3。氧化皮的电阻远高于裸钢表面的氧化膜,并使样品的自腐蚀电位显著上升。氧化皮分为内外两层,外层疏松,内层致密,氧化皮的保护性主要来自内层。致密的氧化皮形成于500~600℃。延长等温时间有利于提高氧化皮的致密度。限氧条件下进行氧化处理不利于氧化皮致密化。致密的氧化皮在腐蚀初期明显延缓了大气腐蚀进程,但在长期腐蚀过程中,反而使腐蚀进程有所加快。这些结果表明,致密的氧化皮在腐蚀过程中难以转化为腐蚀产物,保留于锈层中成为杂质和缺陷,促进了腐蚀。
[Abstract]:The structure and the effect of oxygen flow rate of weathering steel on atmospheric corrosion behavior were studied by XRD, electrochemical measurement and scanning electron microscopy. It was found that the main composition of the oxide layer was Fe3O4 and Fe _ 2O _ 3. The resistance of the oxide layer is much higher than that of the oxide film on the bare steel surface, and the corrosion potential of the sample increases significantly. The outer layer is loose, the inner layer is dense, and the protective layer is mainly from the inner layer. The dense oxide layer was formed at 600 鈩，

本文编号：1953660