船舶海水管系钛合金组织及腐蚀性能研究  

Study on Microstructure and Corrosion of Marine Seawater Piping Titanium Alloy

作　　者：赵成志[1] 余姣姣[1] 袁玉平[1] 张贺新[1] 任江波 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院 [2]浙江省湖州卓信机械有限公司

出　　处：《特种铸造及有色合金》2013年第12期1161-1164,共4页Special Casting & Nonferrous Alloys

基　　金：中央高校基本科研业务费专项资金资助(HEUCF20130910009)

摘　　要：采用真空非自耗电极电弧炉熔炼制备船舶海水管系钛合金铸锭,通过金相显微镜、扫描电镜以及X射线衍射分析等方法对铸态和退火处理的合金的化学成分、显微组织以及相结构等进行分析;并对钛合金耐腐蚀性能进行了评价,结果表明,铸态和退火处理的钛合金,晶粒结构均比较粗大,室温组织是以平直状或编织状α为主要形貌的魏氏组织,并且存在网状晶界α;室温的相组成主要为α相,另外还含有少量的β相,部分成分的钛合金中还有金属化合物Al3Ti析出。合金Ti-2Al-1Fe-1Mo-1Zr在动电位极化曲线测试过程中无钝化和钝化膜被击穿现象,说明了合金在3.5%的NaCl水溶液中的耐腐蚀性能良好;电化学测试相关参数表明,Ti-2Al-1Fe-1Mo-1Zr合金的耐腐蚀性能良好。Titanium alloy for seawater pipeline was prepared by unconsumable vacuum electrode arc melting furnace. The microstructure, phase composition and corrosion resistance of the casted and annealed Ti-based alloys were analyzed by means of OM, SEM, XRD and electrochemical methods. The results show that grain size of the casted Ti-based and the annealed alloys are both coarse structure. The micro-structure at room temperature is mainly widmanstatten structure containing α phase with flat-shaped or basket-shaped structure. Moreover, the widmanstatten structure contains some net-like boundary β phase and Al3Ti metallic compound. The potentiodynamic polarization curve and related electrochemistry analysis reveal that absence of over-passivation and breakdown phenomenon can be observed for Ti2Al-1Fe-1Mo-1Zr. Thus it can be concluded that the tested Ti-based alloys has a good corrosion resistance in 3.5 % NaCl solution.

关 键 词：钛合金 魏氏组织 相结构 腐蚀性能 

分 类 号：TG146.23[一般工业技术—材料科学与工程]