摘要
采用磁悬浮熔炼水冷铜坩埚-负压铜模吸铸法制备了(Ti0.5Ni0.5-xZrx)80Cu20(x=0、0.02、0.04、0.06)非晶复合材料,分析了各种合金试样的相组成,测试了合金试样在人工海水和模拟人体的PBS溶液中的极化曲线,观察了电化学反应后的腐蚀形貌,分析电化学腐蚀产物并进行表征.结果表明:几种合金的组织都是非晶基体与晶体相组成的复合材料,晶体相为B2-Ti(Ni,Cu)奥氏体相和B19’-Ti(Ni,Cu)马氏体相.与晶态TC4合金相比,合金在两种溶液中均具有较好的耐蚀性,且随着Zr元素原子分数的增加,合金的腐蚀抗性也不断增强;当x=0.06时,合金的耐腐蚀性能最为优异,其自腐蚀电位高,为-0.218 V,热力学倾向小不易腐蚀,自腐蚀电流密度较低,为0.912μA·cm^-2,极化电阻大,为3.4 MΩ·cm2,腐蚀的动力学速率低,且在PBS溶液中合金具有更优异的耐蚀性,在腐蚀形貌中未发现明显的点蚀坑.
Samples of(Ti0.5Ni0.5-xZrx)80Cu20 bulk metallic glass with x=0,0.02,0.04 and 0.06 were prepared with method of magneto-suspension melting plus absorptive casting in water-cooling crucible and negative-pressure copper mold.The phase-composition of the alloy samples was analyzed,and the polarization curves of the samples in artificial sea-water and simulated human PBS solution were tested.The morphology of electrochemical corrosion was observed and the electrochemical corrosion product was precipitated and characterized.The result show that the microstructure of the alloy would be composed of amorphous matrix plus crystal phase B2-Ti(Ni,Cu)austenite phase and B19’-Ti(Ni,Cu)martensite phase.It would be gotten that compared with the crystalline TC4 alloy,several alloys would have better corrosion resistance in both artificial sea-water solution and PBS solution,and the corrosion resistance of the alloy would increase with the Zr content.When x=0.06,the alloy would exhibit the most excellent corrosion resistance,its self-corrosion potential was so high as-0.218 V,thermodynamic tendency was so feeble that hard to be corroded,self-corrosion current density was lower as 0.912μA·cm^-2,polarization resistance was large as 3.4 MΩ·cm2 and corrosion kinetic rate was low,and the alloy would have more excellent corrosion resistance in PBS solution and would be no obvious dotted corrosion pit to be found in the corrosion morphology.
作者
赵燕春
蒋建龙
毛瑞鹏
孙浩
寇生中
ZHAO Yan-chun;JIANG Jian-long;MAO Rui-peng;SUN Hao;KOU Sheng-zhong(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China;College of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China)
出处
《兰州理工大学学报》
CAS
北大核心
2020年第2期7-12,共6页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51661017,51551101,51571105,51661016)
甘肃省杰出青年基金(17JR5RA108)。
关键词
非晶复合材料
微观组织
腐蚀性能
amorphous composite
microstructure
corrosion behavior
