高盐废水浓缩环境中的TC4钛合金腐蚀研究  

Research on corrosion of TC4 titanium alloy in concentrated high-salt wastewater environment

作　　者：韩旭 李强 姜训勇[2] 徐克 Han Xu;Li Qiang;Jiang Xunyong;Xu Ke(The Institute of Seawater Deasalination and Multipurpose Utilization,MNR(Tianjin),Tianjin 300192,China;School of Material Science and Engineering,Tianjin University of Technology,Tianjin 300381,China)

机构地区：[1]自然资源部天津海水淡化与综合利用研究所,天津300192 [2]天津理工大学材料科学与工程学院,天津300381

出　　处：《钢铁钒钛》2021年第6期133-137,共5页Iron Steel Vanadium Titanium

基　　金：2019年中央级公益性科研院所基本科研业务费专项资金项目(基于电容去离子技术的超便携应急救生海水淡化装置,K-JBYWF-2019-T07)。

摘　　要：从蒸汽机械压缩技术(MVR)腐蚀环境角度,模拟高盐废水浓缩液开展了TC4材料耐腐蚀性能研究,通过微观组织表征、腐蚀失重、缝隙腐蚀、电化学测试(开位电路、电化学阻抗以及动电位极化曲线测试)等腐蚀测试,证实了TC4合金的(α+β)双相钛合金,在各种高氯离子强度环境中的耐缝隙腐蚀能力较强,14 d全浸试验没有出现局部点蚀,最大腐蚀速率仅1 mg/(cm^(2)·a)左右,远低于2205双相钢在相同环境下的腐蚀情况。电化学测试结果也表明:TC4钛合金在高氯离子强度溶液中,表面形成的惰性钝化层生成迅速并保持稳定,对抑制材料表面腐蚀、缝隙腐蚀也有较明显作用。TC4合金的高温耐腐蚀性能适用于高盐废水环境,在MVR技术处理高氯含量工业污水方面有潜在应用价值。In this paper,the corrosion resistance of TC4 material was studied by simulating the concentrated solution of high salt wastewater from the perspective of mechanical vapor recompression(MVR)corrosion environment.The corrosion tests were carried out through microstructure characterization,corrosion weight loss,crevice corrosion,electrochemical test(open circuit,electrochemical impedance and potentiodynamic polarization curve test).The properties of TC4 alloy were confirmed(α+β)biphase titanium alloy has strong resistance to crevice corrosion in various high chloride ion environments.There is no local pitting corrosion in 14 day full immersion test,and the maximum corrosion rate is only 1 mg/(cm^(2)·a).The results of electrochemical test also show that the inert passivation layer formed on the surface of TC4 titanium alloy in high chloride ion solution is generated rapidly and remains stable,which also plays an obvious role in inhibiting material surface corrosion and crevice corrosion.TC4 alloy has high temperature corrosion resistance and is suitable for high-salt wastewater environment.For MVR technology,it has potential application value in the treatment of industrial wastewater with high chlorine content.

关 键 词：钛合金 蒸汽机械压缩(MVR) 高盐废水 钝化层 腐蚀速率 缝隙腐蚀 

分 类 号：TF823[冶金工程—有色金属冶金] TG174[金属学及工艺—金属表面处理]