NaCl盐雾环境下Ti60合金的中温腐蚀行为

doi:10.11902/1005.4537.2020.186

中国腐蚀与防护学报

2021, Vol. 41

Issue (5): 595-601 DOI: 10.11902/1005.4537.2020.186

研究报告

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NaCl盐雾环境下Ti60合金的中温腐蚀行为

李蕊¹, 崔宇¹^,², 刘莉¹(

), 范磊³, 孟凡帝¹, 王福会¹

^1.沈阳材料科学国家研究中心东北大学联合研究分部沈阳 110819
^2.中国科学院金属研究所沈阳 110016
^3.中国石油天然气集团公司管材研究所石油管材及装备材料服役行为与结构安全国家重点实验室西安 710077

Corrosion Behavior of Ti60 Alloy in Fog of NaCl Solution at 600 ℃

LI Rui¹, CUI Yu¹^,², LIU Li¹(

), FAN Lei³, MENG Fandi¹, WANG Fuhui¹

^1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^3.State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, Xi'an 710077, China

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摘要:

利用增重测试、扫描电镜 (SEM)、X射线衍射仪 (XRD) 和电子探针 (EPMA) 等分析技术，从氧化动力学、氧化膜相组成和微观结构方面，研究了Ti60合金在600 ℃下NaCl盐雾环境中的腐蚀行为。结果表明，Ti60合金在中温NaCl盐雾环境中腐蚀100 h后，其腐蚀速率远远低于在固态NaCl+H₂O+O₂环境中的。在NaCl盐雾环境中表面形成双层腐蚀产物，外层相对致密，以Na₂TiO₃和TiO₂为主；内层为颗粒状，以TiO和Ti₂O为主。NaCl盐雾环境是富氧、富水蒸汽环境，更倾向于形成致密的TiO₂，减缓材料的腐蚀。此外，Cl在氧化膜内层富集，并以“活性氧化”机制加速Ti60合金的腐蚀。

关键词 ： Ti60合金, NaCl盐雾, 固态NaCl+H₂O+O₂沉积盐, 中温腐蚀

Abstract：

The corrosion behavior of Ti60 alloy in fog of NaCl solution at 600 ℃ has been characterized by mass gain measurement, scanning electron microscopy (SEM), X-ray diffractometer (XRD) and electron probe microanalyzer (EPMA). The results suggested that the corrosion rate of Ti60 alloy in fog of NaCl solution is much lower than that with solid NaCl deposit in H₂O+O₂ atmosphere after 100 h corrosion at 600 ℃. The corrosion products formed in fog of NaCl solution are of two layer-structure, the inner layer consists of TiO and Ti₂O, while the outer one TiO₂ and Na₂TiO₃. The fog of NaCl solution is rich in O₂ and water vapor, which should be favor thermodynamically for the stable existence of TiO₂ oxide, further for the formation of dense oxide scale of TiO₂, therefore, the corrosion rate of the alloy in the fog of NaCl solution is reduced. In addition, Cl concentrated in the inner layer of the corrosion products, and might accelerate the corrosion of Ti60 alloy in accord with "active oxidation" mechanism.

Key words： Ti60 alloy fog of NaCl solution solid NaCl+H₂O+O₂ deposit high temperature corrosion

收稿日期: 2020-10-10

ZTFLH:

TG174

基金资助:国家重点研发计划(2017YFB0702303)

通讯作者: 刘莉 E-mail: liuli@mail.neu.edu.cn

Corresponding author: LIU Li E-mail: liuli@mail.neu.edu.cn

作者简介: 李蕊，女，1993年生，博士生

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引用本文:

李蕊, 崔宇, 刘莉, 范磊, 孟凡帝, 王福会. NaCl盐雾环境下Ti60合金的中温腐蚀行为[J]. 中国腐蚀与防护学报, 2021, 41(5): 595-601.
Rui LI, Yu CUI, Li LIU, Lei FAN, Fandi MENG, Fuhui WANG. Corrosion Behavior of Ti60 Alloy in Fog of NaCl Solution at 600 ℃. Journal of Chinese Society for Corrosion and protection, 2021, 41(5): 595-601.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.186 或 https://www.jcscp.org/CN/Y2021/V41/I5/595

图1 Ti60合金的金相组织

图2 Ti60合金在600 ℃下H2O+O2，NaCl盐雾和固态NaCl+H2O+O2 环境中腐蚀100 h的动力学曲线[17]

图3 Ti60合金在600 ℃下H2O+O2[11]，NaCl盐雾和固态NaCl+H2O+O2[13]环境中腐蚀100 h后的表面形貌

图4 Ti60合金在600 ℃下H2O+O2[18]，NaCl盐雾和固态NaCl+H2O+O2[13]环境中腐蚀100 h后的截面形貌

图5 600 ℃ Ti60合金在NaCl盐雾和固态NaCl+H2O+O2[13]环境中腐蚀100 h后腐蚀产物的XRD相分析

图6 Ti60合金在NaCl盐雾和固态NaCl+H2O+O2[13]环境中腐蚀100 h后腐蚀产物膜截面的元素面分布

图7 依据HSC Chemistry 6.1计算得到的Ti—Cl—O体系在600 ℃稳定相图

图8 Ti60合金在600 ℃下NaCl盐雾环境中的腐蚀机理示意图

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