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亞共析鈾鈮合金激光焊接微觀結(jié)構(gòu)及電化學(xué)行為
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Microstructure and Corrosion Behavior of the Laser
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    摘要:

    采用光學(xué)顯微鏡、掃描電鏡、X射線衍射儀和電化學(xué)綜合測(cè)試儀對(duì)亞共析珠光體鈾鈮合金激光焊接接頭的微觀結(jié)構(gòu)和電化學(xué)行為開展了研究，結(jié)果顯示：亞共析珠光體鈾鈮合金焊縫晶粒尺寸約50 μm，焊縫相結(jié)構(gòu)為單相正交結(jié)構(gòu)α`馬氏體；在50 μg/g Cl-的NaCl 溶液中，焊縫金屬腐蝕電位比基材低約400 mV，構(gòu)成了電偶腐蝕對(duì)，在電偶腐蝕和自腐蝕共同作用下，焊接接頭的腐蝕電流比焊縫金屬和基材分別高約3至10倍，接頭整體抗腐蝕性能低于基材，腐蝕形式表現(xiàn)為均勻腐蝕

    Abstract:

    The microstructures and corrosion behavior of the hypoeutectoid U-Nb alloy laser welded joint were investigated by OM, SEM, XRD and electrochemical analysis. The results indicate that the grain size of the weld zone of the hypoeutectoid pearlite U-Nb alloy is about 50 μm and the weld zone is only composed of α′ martensite with orthogonal crystal structure. After immersion in 3.5%NaCl solution, the corrosion potential of weld metal is ~400 mV lower than the substrate’s, and the corrosion couple forms between weld metal and the rest of the welded. The results of surface morphology and linear polarization show that the corrosion process of the welded joint includes galvanic corrosion and self-corrosion while galvanic corrosion behavior is the dominated. The corrosion current of welded joint is about 3 times higher than that of the substrate and 10 times higher than that of the weld metal. The overall anti-corrosion property of welded joint is depressed. The corrosion is uniform

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李玉斌,王向東,王 巍,蒲 朕,張彤艷,王勤國(guó).亞共析鈾鈮合金激光焊接微觀結(jié)構(gòu)及電化學(xué)行為[J].稀有金屬材料與工程,2015,44(2):391~396.[Li Yubin, Wang Xiangdong, Wang Wei, Pu Zheng, Zhang Tongyan, Wang Qinguo. Microstructure and Corrosion Behavior of the Laser[J]. Rare Metal Materials and Engineering,2015,44(2):391~396.]
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  • 收稿日期:2014-01-18
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  • 在線發(fā)布日期: 2015-05-29
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