摘要
The ultra-high strength Cu-20Ni-20 Mn 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% Na Cl 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.
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1204MPa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。
作者
TANG Shuai-kang
LI Zhou
GONG Shen
XIAO Zhu
唐帅康;李周;龚深;肖柱(School of Materials Science and Engineering,Central South University,Changsha 410083,China;State Key Laboratory for Powder Metallurgy,Central South University,Changsha 410083,China;Key Laboratory of Non-ferrous Metal Materials Science and Engineering,Ministry of Education,Changsha 410083,China)
基金
Project(2017YFB0306105)supported by the National Key R&D Program of China
Projects(51601227,51701241)supported by the National Natural Science Foundation of China。
