Influence of rare earth elements on corrosion resistance of BFe10-1-1 alloys in flowing marine water  

作　　者：林高用 杨伟 万迎春 唐鹏钧 魏笔 张胜华 

机构地区：[1]School of Materials Science and Engineering Central South University,Changsha 410083,China [2]Gao Xin Zhangtong Limited Liability Company,215600,China

出　　处：《Journal of Rare Earths》2009年第2期259-263,共5页稀土学报（英文版）

基　　金：supported by the Science and Technology Payoffs Transformation Program of Jiangsu Province (DA2006034);the Program of National College Student Creative Experiment (081053309)

摘　　要：The corrosion behavior of BFe10-1-1 alloy with different rare earth （RE） contents in simulated flowing marine water was investigated by X-ray diffractometer and scanning electron microscope （SEM）. It was demonstrated that the corrosion rate of BFel0-1-1 alloy with the same chemical compositions in faster flow velocity of marine water was higher than that in a lower flow velocity of marine water. Fixing the flow velocity, BFe 10-1-1 alloy had the best flushing corrosion resistance when the RE content was 0.04wt.%. The consequence of such good corrosion resistance was attributed to the formation of compact protective film on alloy surface containing RE phase such as CeNis. The RE-contained film combines with other corrosion products firmly, which was difficult to fall off from the alloy surface in the flowing marine water. Additionally, SEM analysis confirmed that pitting mechanism, which would be transformed to spalling mechanism gradually with further increasing RE content, was the prevalent mechanism when the alloy contained 0.04wt.%RE.The corrosion behavior of BFe10-1-1 alloy with different rare earth （RE） contents in simulated flowing marine water was investigated by X-ray diffractometer and scanning electron microscope （SEM）. It was demonstrated that the corrosion rate of BFel0-1-1 alloy with the same chemical compositions in faster flow velocity of marine water was higher than that in a lower flow velocity of marine water. Fixing the flow velocity, BFe 10-1-1 alloy had the best flushing corrosion resistance when the RE content was 0.04wt.%. The consequence of such good corrosion resistance was attributed to the formation of compact protective film on alloy surface containing RE phase such as CeNis. The RE-contained film combines with other corrosion products firmly, which was difficult to fall off from the alloy surface in the flowing marine water. Additionally, SEM analysis confirmed that pitting mechanism, which would be transformed to spalling mechanism gradually with further increasing RE content, was the prevalent mechanism when the alloy contained 0.04wt.%RE.

关 键 词：rare earths BFe10-1-1 alloy corrosion resistance PITTING 

分 类 号：TG146.4[一般工业技术—材料科学与工程]