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对比研究了新型含铝高铬铸铁的高温耐腐蚀性能。利用失重法测绘了合金的腐蚀动力学曲线;用扫描电子显微镜对热腐蚀后氧化膜(腐蚀膜)的形貌进行观察,并分析其化学成分分布;借助旋转阳极衍射仪对热腐蚀产物进行物相分析;并讨论了新型含铝高铬铸铁的热腐蚀机理。结果表明,与普通高铬铸铁相比,在长时间高温热腐蚀过程中,新型含铝高铬铸铁表面的氧化膜具有更好的完整性和致密性,使得基体在热腐蚀过程中一直保持很低的腐蚀速率,使腐蚀介质无法扩散到基体,不易造成进一步腐蚀破坏。
The high temperature corrosion resistance of new aluminum-containing high-chromium cast iron was compared. The corrosion kinetics curves of the alloy were measured by weight loss method. The morphology of the oxide film (corrosion film) after hot etching was observed by scanning electron microscope, and its chemical composition distribution was analyzed. By means of rotating anode diffractometer, Phase analysis; and discussed the hot corrosion mechanism of the new aluminum-containing high chromium cast iron. The results show that the oxide film on the surface of the new aluminum-containing high-chromium cast iron has better integrity and compactness than the ordinary high-chromium cast iron during hot corrosion at high temperature for a long time, Low corrosion rate, the corrosive medium can not spread to the matrix, not easy to cause further corrosion damage.