船舶海水管系钛合金组织及腐蚀性能研究

赵成志; 余姣姣; 袁玉平; 张贺新; 任江波

doi:10.15980/j.tzzz.2013.12.019

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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
2013年33卷第12期页码：1161-1164
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.12.019

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[1]赵成志,余姣姣,袁玉平,张贺新,任江波.船舶海水管系钛合金组织及腐蚀性能研究[J].特种铸造及有色合金,2013,33(12):1161-1164.

Zhao Chengzhi, Yu Jiaojiao, Yuan Yuping, et al. Study on Microstructure and Corrosion of Marine Seawater Piping Titanium Alloy[J]. Special Casting & Nonferrous Alloys, 2013,33(12):1161-1164.
[1]赵成志,余姣姣,袁玉平,张贺新,任江波.船舶海水管系钛合金组织及腐蚀性能研究[J].特种铸造及有色合金,2013,33(12):1161-1164. DOI： 10.15980/j.tzzz.2013.12.019.

Zhao Chengzhi, Yu Jiaojiao, Yuan Yuping, et al. Study on Microstructure and Corrosion of Marine Seawater Piping Titanium Alloy[J]. Special Casting & Nonferrous Alloys, 2013,33(12):1161-1164. DOI： 10.15980/j.tzzz.2013.12.019.

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。

Abstract

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 microstructure at room temperature is mainly widmanstatten structure containingαphase with flat-shaped or basket-shaped structure.Moreover

the widmanstatten structure contains some net-like boundaryβ phase and Al3 Ti 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.