Environment-induced cracking of two nickel base amorphous alloys in acidic chloride solutions

Environment-induced cracking of two nickel base amorphous alloys in acidic chloride solutions
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两种镍基非晶合金在酸性氯化物溶液中的环境诱发裂纹

DOI：
10.1016/0921-5093(92)90401-l
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
R. Latanision
R. Latanision
中科院分区：
--
文献类型：
--
作者：
Y. Zuo;R. Latanision

文献摘要

被引文献

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采用恒延伸率测试方法，研究了两种镍基非晶合金Ni-7Cr3Fe4.5Si3.2B和Ni13Cr4.2Fe4.5Si2.8B在0.1 M H2SO4+ NaCl溶液中的环境诱发裂纹。两种合金在阴极电位下均表现出氢脆。较高的铬含量有利于合金的抗氢脆性能。在弱充氢条件下，断口形貌呈脉状，但在强充氢条件下，观察到大面积的平坦无特征裂纹，这表明不同充氢条件下的裂纹模式不同。在被动电位下，两种合金均表现出腐蚀辅助断裂。氯化物引起的局部溶解导致应力集中，然后引发裂纹。
Environment-induced cracking of two nickel base amorphous alloys, Ni-7Cr3Fe4.5Si3.2B and Ni13Cr 4.2Fe4.5Si2.8B, was investigated in 0.1 M H2SO4+ NaCl solutions by means of constant extension rate testing. Both alloys showed hydrogen embrittlement at cathodic potentials. Higher chromium content is beneficial to resistance to hydrogen embrittlement of the alloys. Under weak hydrogen charging conditions, the morphology of the fracture surface was vein-like, but under strong hydrogen charging conditions large areas of flat featureless cracking were observed, which suggests different cracking modes under different hydrogen charging conditions. At passive potentials, both alloys showed corrosion-assisted fracture. Chloride-induced local dissolution led to stress concentration and then to the initiation of cracks.