<strong>600℃ NaCl</strong>盐雾环境下<strong>GH4169</strong>合金的腐蚀行为

doi:10.11900/0412.1961.2022.00204

金属学报

2023, Vol. 59

Issue (11): 1475-1486 DOI: 10.11900/0412.1961.2022.00204

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600℃ NaCl盐雾环境下GH4169合金的腐蚀行为

张伟东¹, 崔宇²(

), 刘莉¹(

), 王文泉¹, 刘叡¹, 李蕊¹, 王福会¹

^1.东北大学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师昌绪先进材料创新中心沈阳 110016

Corrosion Behavior of GH4169 Alloy in NaCl Solution Spray Environment at 600^oC

ZHANG Weidong¹, CUI Yu²(

), LIU Li¹(

), WANG Wenquan¹, LIU Rui¹, LI Rui¹, WANG Fuhui¹

^1.Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
^2.Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

张伟东, 崔宇, 刘莉, 王文泉, 刘叡, 李蕊, 王福会. 600℃ NaCl盐雾环境下GH4169合金的腐蚀行为[J]. 金属学报, 2023, 59(11): 1475-1486.
Weidong ZHANG, Yu CUI, Li LIU, Wenquan WANG, Rui LIU, Rui LI, Fuhui WANG. Corrosion Behavior of GH4169 Alloy in NaCl Solution Spray Environment at 600^oC[J]. Acta Metall Sin, 2023, 59(11): 1475-1486.

全文: PDF(5135 KB) HTML

摘要:

利用氧化动力学测试，结合微观表征技术，从腐蚀动力学、腐蚀层相组成和组织结构等方面，研究了GH4169合金在600℃的NaCl盐雾环境中的腐蚀行为。研究表明，GH4169合金在NaCl盐雾和固态NaCl + 含O₂水蒸汽环境下的腐蚀增重均明显增加，且后者的腐蚀速率显著大于前者。GH4169合金在NaCl盐雾环境下的腐蚀产物主要为Cr₂O₃、Fe₂O₃、NiFe₂O₄和NaNbO₃，其腐蚀层较为致密，且氯在内腐蚀层中富集。在NaCl盐雾环境下，腐蚀初期GH4169合金以氧化和氯的活性氧化机理共同作用加速腐蚀，随着NaCl沉积量的增加合金腐蚀逐渐变为以氯的活性氧化机制为主的加速腐蚀。此外，对GH4169合金的主要元素及其氧化物在中温NaCl盐雾环境下的反应敏感性进行了计算分析，结果表明，NaCl盐雾环境下GH4169合金内各元素对氯活化腐蚀敏感性的排序依次为：Ti > Al > Nb、Cr > Fe >Mo、Ni，合金氧化物对环境的敏感性顺序为：TiO₂ > MoO₂ > Cr₂O₃(Nb₂O₅) > Fe₂O₃ > Al₂O₃ > NiO。

关键词 ： GH4169合金, NaCl盐雾, 合金元素敏感性

Abstract：

The corrosion behavior of engine materials of airplanes working in marine environments is accelerated by the synergistic effects of NaCl particles and water vapor at high temperatures. This work examined the corrosion behavior of GH4169 alloy with a NaCl solution spraying at 600^oC using an oxidation kinetics test and micro characterization technology in the aspects of corrosion kinetics, corrosion layer phase composition, and microstructure. The weight gain of the GH4169 alloy corroded in the NaCl solution spraying environment was much lower than that in solid NaCl + wet O₂ after 20 h corrosion at 600^oC. The corrosion products of the GH4169 alloy in the NaCl solution spray environment were less complex than those in the solid NaCl + wet O₂ environment, but they were denser. In addition, Cl was concentrated in the inner layer of the corrosion products and accelerated the corrosion of GH4169 alloy via an “active oxidation” mechanism at the initial stage. When NaCl deposition was increased, the corrosion mechanism of GH4169 alloy changed gradually to Cl-induced “active oxidation.” The sensitivity of GH4169 alloy in the NaCl solution spray environment at 600^oC was analyzed. Overall, the sensitivity of elements in GH4169 alloy to chlorine activated corrosion was Ti > Al > Nb, Cr > Fe > Mo, Ni, whereas the sensitivity of the oxides was TiO₂ > MoO₂ > Cr₂O₃(Nb₂O₅) > Fe₂O₃ > Al₂O₃ > NiO.

Key words： GH4169 alloy NaCl solution spray sensitivity of alloy element

收稿日期: 2022-04-29

ZTFLH:

TG174

基金资助:国家自然科学基金企业创新联合基金重点项目(U20B2026)

通讯作者: 刘莉，liuli@mail.neu.edu.cn，主要从事腐蚀电化学、金属腐蚀与防护方面的研究；
崔宇，ycui@imr.ac.cn，主要从事海洋中温环境金属腐蚀与防护研究

Corresponding author: LIU Li, professor, Tel: 15904072057, E-mail: liuli@mail.neu.edu.cn;
CUI Yu, associate researcher, Tel: 15004059681, E-mail: ycui@imr.ac.cn

作者简介: 张伟东，男，1989年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00204 或 https://www.ams.org.cn/CN/Y2023/V59/I11/1475

图1 中温NaCl盐雾和固态NaCl + 含O2水蒸汽腐蚀模拟装置示意图

图2 GH4169合金在600℃的纯O2、含O2水蒸汽、固态NaCl + 含O2水蒸汽和NaCl盐雾环境下腐蚀 20 h的腐蚀动力学曲线

图3 GH4169合金在600℃的固态NaCl + 含O2水蒸汽和NaCl盐雾环境服役5 min后表面SEM像

图4 GH4169合金在600℃纯O2、含O2水蒸汽、固态NaCl + 含O2水蒸汽和NaCl盐雾环境下腐蚀20 h后的表面SEM像

表1 图4中各点的EDS结果 (mass fraction / %)

图5 GH4169合金在600℃纯O2、含O2水蒸汽、固态NaCl + 含O2水蒸汽和NaCl盐雾环境腐蚀20 h后的截面SEM像

图6 GH4169合金在600℃纯O2、含O2水蒸汽、固态NaCl + 含O2水蒸汽和NaCl盐雾环境下腐蚀20 h的XRD谱

图7 GH4169合金在600℃固态NaCl + 含O2水蒸汽和NaCl盐雾环境下腐蚀20 h后截面的EPMA元素面分布图

图8 GH4169合金在600℃的NaCl盐雾环境中腐蚀100 h后截面的EPMA元素面分布图

图9 GH4169合金在600℃下NaCl盐雾环境腐蚀20 h后腐蚀产物膜的TEM像、SAED花样及Cl元素线分布结果

图10 GH4169合金在600℃固态NaCl + 含O2水蒸汽环境腐蚀 20 h后内腐蚀区域的TEM像及EDS结果

表2 相关化学反应在600℃时的标准Gibbs自由能

图11 M-Cl-O体系在600℃时以lgpO2和lgpCl为坐标的平衡图

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