【摘要】 研究了Ｆｅ－２８Ａｌ－５Ｃｒ，Ｆｅ－２８Ａｌ－５Ｃｒ－０．５Ｎｂ－０．１Ｃ合金及其采用钨极氩弧焊焊接的Ｆｅ３Ａｌ 基合金焊缝，在模拟汽车尾气气氛中的腐蚀行为，分析了腐蚀产物的组成及形成机理，并与目 前在汽车尾气系统应用的Ａ３低碳钢及１Ｃｒ１８Ｎｉ９不锈钢进行对比，结果表明，由于在实验条件 下Ｆｅ３Ａｌ基合金及其焊缝表面形成了一层致密的Ａｌ２Ｏ３氧化膜，与不锈钢相同，显示出优良的抗 蚀性能．与此相对比，由于Ａ３钢表面形成疏松的Ｆｅ２Ｏ３膜容易剥落，而使腐蚀加剧．更多还原

【Abstract】 The behavior of corrosion resistance to simulated exhaust gas of Fe-28Al-5Cr, Fe-28Al-5Cr- 0.5Nb-0.1C and GTA (gas tungsten arc) welded Fe3Al based alloys has been investigated. The composition and emerging mechanism of corrosion scale have been analyzed, and compared with former materials used in the exhaust manifold system such as low carbon steel A3 and 1Cr18Ni9 stainless. The results indicates that Fe3Al based alloys and its weldment exhibited corrosion resistance to the test environment as good as stainless because of the producing of continuous and dense Al2O3 surface scale, by contrast, the oxide of A3 steel was loose and discontinuous Fe2O3 scale which was easy to be peeled off and led corrosion accelerated.更多还原