敏化处理对825合金晶间腐蚀性能的影响

张恒坤; 罗先甫; 申澎洋; 张文利; 查小琴

敏化处理对825合金晶间腐蚀性能的影响

1. 中国船舶集团有限公司第七二五研究所, 河南洛阳 471023;
2. 河南省船舶及海工装备结构材料技术与应用重点实验室, 河南洛阳 471023

详细信息

作者简介:
张恒坤,男,1991年生,高级工,主要从事材料性能检测。E-mail:1831358284@qq.com

中图分类号: TG142
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- 文章访问数: 81
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- 被引次数: 0
出版历程
- 收稿日期: 2022-12-06
- 网络出版日期: 2024-05-09

Effect of Sensitization Treatment on Intergranular Corrosion Property of 825 Alloy

1. Luoyang Ship Material Research Institute, Luoyang 471023, China;
2. Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments, Luoyang 471023, China

摘要

摘要: ,采用50 %硫酸-硫酸铁晶间腐蚀试验及动电位极化曲线分析方法对敏化态825合金抗晶间腐蚀性能异常增强现象进行研究,采用金相(OM)、扫描电镜(SEM)和透射电镜(TEM)观察形貌并分析其原因。结果表明:825合金在750 ℃下保温1 h得到的敏化态试样的腐蚀速率和腐蚀电流密度分别为固溶态试样的57 %和48 %;敏化态和固溶态试样的晶界均无析出物析出,晶界周边无贫铬区,材料无晶间腐蚀敏感性;但晶内析出的TiN及Ti(C,N)粒子与基体电位存在差异,易导致点腐蚀的发生。经过750 ℃保温1 h的敏化处理后,可得到晶粒大小均匀、内部析出的TiN及Ti(C,N)粒子分布更加均匀、材料抗晶间腐蚀性能增强的825合金。
- 825合金 /
- 晶间腐蚀 /
- 敏化处理 /
- 动电位极化曲线
Abstract: The influence of sensitisation treatment on the intergranular corrosion properties of 825 alloy is investigated by 50 % sulphuric acid-iron sulphate intergranular corrosion test and polarisation curve analysis, and the causes are observed and analysed by metallography (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the corrosion rate and corrosion current density of the sensitized specimen of 825 alloy held at 750 ℃ for 1 h are 57 % and 48 % of those of the solid solution specimen, respectively. There are no precipitate precipitation at the grain boundaries of the sensitized and solid solution specimens, and no chromium-poor zones around the grain boundary, therefore, the material has no intergranular corrosion susceptibility. However, there are differences in potentials between the precipitated TiN and Ti(C,N) particles within the grains and the substrate, which can easily lead to the occurrence of pitting corrosion. After sensitisation treatment at 750 ℃ for 1 h, the grain size of the 825 alloy is uniform, the distribution of TiN and Ti(C,N) particles precipitated is uniform, and the corrosion resistance of the material is enchanced.
- 825 alloy /
- intergranular corrosion /
- sensitization treatment /
- potentiodynamic polarization curve

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参考文献(15)

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