CLAM钢TIG焊接头在静态和动态液态铅铋合金中的腐蚀行为

Corrosion behavior of China low activation martensitic( CLAM) steel joints by TIG in stagnant and dynamic liquid lead bismuth eutectic alloy

研究450℃时中国低活化马氏体(CLAM)钢TIG焊接头在静态和动态饱和氧液态Pb-Bi共晶合金(LBE)中的腐蚀行为。2种状态下,腐蚀时间均为400 h。其中动态下,相对速度为1.1 m/s。研究发现,静态下,CLAM钢焊接接头表面有明显的腐蚀,焊缝和热影响区表面均生成了双氧化层,外氧化层为疏松多孔的Fe3O4,内氧化层为致密的Fe Cr2O4,基体内部没有Pb,Bi渗入。动态下,腐蚀情况与静态下类似,但内外氧化层厚度均明显降低,尤其是内氧化层厚度大大降低,表明试样表面受腐蚀情况大大加重。

The corrosion behavior of China low activation martensitic( CLAM) steel joints by TIG welding( weld zone and heat affected zone) in stagnant and dynamic oxygen saturated lead bismuth eutectic(LBE) at 450 ℃ was studied in this paper. Under two situations, both of the corrosion time was 400 h and the relative velocity was 1.1 m/s in dynamic situation. The results showed that the obvious corrosion phenomenon of the sample surface was observed in stagnant LBE. A double layer oxide film which consisted of a loose and porous Fe_3O_4 outer layer and a dense Fe-Cr spinel inner layer was formed on the surface of the CLAM joints. No penetration of Pb, Bi into the matrix was found.The corrosion state in dynamic LBE was similar to which in stagnant LBE. But it was decreased obviously that the thickness of the outer oxide layer and the inner oxide layer. The results showed that the corrosion situation was more serious on the CLAM sample surface, especially because of the serious decrease of dense inner oxide layer.