不同表面处理对316L钢焊缝耐液态铅铋腐蚀的影响
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摘要
设计制造了一套耐高速流液态金属腐蚀试验装置,用以研究分别用不同号数砂纸打磨和不同抛光处理后的316L钢焊缝在550℃的流动(相对流速为2. 62 m/s)液态铅铋合金中的腐蚀情况。研究发现各组试样都形成了双氧化层结构,内层主要为较疏松的Fe_3O_4,外层主要为较致密的FeCr_2O_4;表面粗糙度越小,元素传质过程越慢,高速流动的液态LBE磨蚀作用越小,316L钢焊缝的耐蚀性越好。
A high-speed flow liquid metal corrosion test device was designed and manufactured to study the corrosion behavior of 316 L stainless steel welds with different grades of sandpaper and different polishing treatments in the flow liquid lead-bismuth alloy at 550 ℃( relative flow rate of 2. 62 m/s). The studies found that all the samples formed a double oxide layer structure,the inner layer is mainly loose Fe_3O_4,and the outer layer is mainly dense Fe Cr_2O_4. The smaller the surface roughness,the slower the element mass transfer process. The smaller the abrasive effect of the high-speed liquid LBE,the better the corrosion resistance of the 316 L steel weld.
A high-speed flow liquid metal corrosion test device was designed and manufactured to study the corrosion behavior of 316 L stainless steel welds with different grades of sandpaper and different polishing treatments in the flow liquid lead-bismuth alloy at 550 ℃( relative flow rate of 2. 62 m/s). The studies found that all the samples formed a double oxide layer structure,the inner layer is mainly loose Fe_3O_4,and the outer layer is mainly dense Fe Cr_2O_4. The smaller the surface roughness,the slower the element mass transfer process. The smaller the abrasive effect of the high-speed liquid LBE,the better the corrosion resistance of the 316 L steel weld.
引文
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[6]雷玉成,岳加佳,崔剑,等.一种实验用真空电阻炉,ZL201510777781. X U[P]. 2017.
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[2]马栩泉.核能开发与应用[M].北京:化学工业出版社,2014.
[3] Gromov B F,Belomitcev Y S,Yefimov E I,et al. Use of lead-bismuth coolant in nuclear reactors and accelerator-driven systems[J]. Nuclear Engineering&Design,1997,173(1):207-217.
[4] Rao V S,Lim J,Hwang I S. Analysis of 316L stainless steel pipe of lead-bismuth eutectic cooled thermo-hydraulic loop[J]. Annals of Nuclear Energy,2012,48(12):40-44.
[5] Martín-Muoz F J,Soler-Crespo L,Gómez-Briceo D. Assessment of the influence of surface finishing and weld joints on the corrosion/oxidation behaviour of stainless steels in lead bismuth eutectic[J]. Journal of Nuclear Materials,2011,416(1):80-86.
[6]雷玉成,岳加佳,崔剑,等.一种实验用真空电阻炉,ZL201510777781. X U[P]. 2017.
[7]戎利建.铅与铅铋共晶合金手册[M].北京:科学出版社,2014.
[8] Zhang Jinsuo,Li N. Review of the studies on fundamental issues in LBE corrosion[J]. Journal of Nuclear Materials,2008,373(1-3):351-377.