测量了不同稀土含量的BFe10-1-1合金在流动海水介质中的腐蚀速率, 并采用X射线衍射仪和扫描电子显微镜等手段分析腐蚀产物. 结果表明,对于成分相同的BFe10-1-1合金, 海水流速越大,腐蚀速率越大; 在流动的人工海水中, BFe10-1-1合金腐蚀类型以剥蚀为主,稀土含量为0.04%时合金的耐海水腐蚀性能最好, 表面形成一层致密的含稀土相(如CeNi5)的腐蚀产物层, 微裂纹较少, 与基体结合牢固,能有效地减缓腐蚀速率,提高耐腐蚀性能; 当稀土含量过高时, 耐腐蚀性能反而降低.
The corrosion behavior of BFe10-1-1 alloy with different rare earth (RE) content in simulated flowing sea water was investigated by corrosion rate measurement, X-ray diffractometer and scanning electronic microscope (SEM). It was demonstrated that the corrosion rate of BFe10-1-1 alloy with the same chemical compositions in faster flow velocity of sea water was higher than that in lower flow velocity of sea water. Exfoliation corrosion was the prevalent corrosion mechanism when BFe10-1-1 alloy was in the flowing sea water. BFe10-1-1 alloy has the best corrosion resistance when the RE content is 0.04 mass %. The consequence of such good corrosion resistance is attributed to the formation of a compact protective film on the alloy surface which contains RE phases such as CeNi5. The RE-contained film combines with other corrosion products firmly, which has few microcracks and good adhasive to the substrate alloy surface in the flowing sea water. Whereas, the amount of RE elements addition higher than 0.04 mass% deteriorates the corrosion resistance of the alloys..
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