Abstract
The ultra-high strength Cu-20Ni-20Mn alloy was prepared by vacuum melting and its mechanical property and corrosion behavior were investigated. After thermomechanical treatment, the alloy exhibited an ultra-high tensile strength of 1204 MPa and the applicable elongation of up to 6.2%. With the increasing exposure time in 3.5% NaCl solution, the corrosion current of the alloy decreased, while the polarization resistance and the charge-transfer resistance of the corrosion surface increased. The corrosion products formed on the surface of the alloy exposed for 1 d, and further corrosion made the corrosion product layer much dense, increasing the corrosion resistance and protecting the alloy from further corrosion.
摘要
通过真空熔炼制备了拥有超高强度的Cu-20Ni-20Mn 合金,并研究了其力学性能和腐蚀行为. 结果表明:经过一系列变形和热处理工艺后,该合金表现出1204 MPa 的超高拉伸强度,且伸长率高 达6.2%.随着合金在3.5%NaCl 溶液中暴露腐蚀时间的延长,合金样品的腐蚀电流降低,而腐蚀表面 的极化电阻和电荷转移电阻增加.腐蚀产物在暴露1 d 时已在合金表面上形成,并进一步腐蚀,使得 腐蚀产物层变得致密.腐蚀产物层增强了合金的耐腐蚀性能,保护合金免受进一步的腐蚀
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Foundation item: Project(2017YFB0306105) supported by the National Key R&D Program of China; Projects(51601227, 51701241) supported by the National Natural Science Foundation of China
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Tang, Sk., Li, Z., Gong, S. et al. Mechanical property and corrosion behavior of aged Cu-20Ni-20Mn alloy with ultra-high strength. J. Cent. South Univ. 27, 1158–1167 (2020). https://doi.org/10.1007/s11771-020-4356-4
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DOI: https://doi.org/10.1007/s11771-020-4356-4