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采用扫描电子显微镜分析法(SEM)和X射线衍射法,研究了低活化马氏体(CLAM)钢TIG焊接接头在500℃的静态液态Pb-Bi合金中腐蚀400 h的腐蚀行为。结果表明,试样表面有明显的腐蚀现象。试样表面形成了具有保护作用的氧化层,外氧化层为疏松多孔的Fe_3O_4,内氧化层为致密的FeCr_2O_4,基体内部没有发现Pb、Bi的渗透。并且对比分析了不同焊接热输入的焊接接头的腐蚀机理。
The corrosion behavior of the TIG welded joints of low activation martensite (CLAM) steel in 400 ℃ static liquid Pb-Bi alloy at 500 ℃ was investigated by scanning electron microscopy (SEM) and X-ray diffraction. The results show that the sample surface has obvious corrosion phenomenon. The surface of the sample formed a protective oxide layer. The outer oxide layer was loose and porous Fe_3O_4, the inner oxide layer was dense FeCr_2O_4, and the penetration of Pb and Bi was not found inside the matrix. And the corrosion mechanism of welded joint with different welding heat input is compared and analyzed.