表面技术2015，Vol.44Issue(12)：41-48,8.DOI:10.16490/j.cnki.issn.1001-3660.2015.12.007
炼油加工过程中氯离子与硫离子对316L不锈钢和Monel合金腐蚀的影响
Effect of Chlorine Ion and Sulfur Ion on Corrosion of 316 L Stainless Steel and Monel Alloy in Oil Refining Process
孙亮 1侯艳宏 1杨席 2张志恒 2朱元强 2王虎 3唐鋆磊2
作者信息
- 1. 中海油惠州炼油分公司,广东 惠州516086
- 2. 西南石油大学 化学化工学院,成都610500
- 3. 西南石油大学 材料科学与工程学院,成都610500
- 折叠
摘要
Abstract
Objective To investigate the influences of contents of chloride and sulfur ions on corrosion rates of 316L stainless steel and nickel-based alloy Monel in crude oil fractions and overhead aqueous phase of crude oil unit. Methods The corrosion rates of 316L stainless steel and Monel alloy in aqueous phase and oil phase containing different concentrations of chloride ions and sulfur ions were obtained by corrosion coupon experiment. SEM ( scanning electron microscope) was used to observe the surface microstructure of corroded 316L and Monel alloys. The influence of two kinds of ions on the corrosion of 316L stainless steel and Monel alloy was discussed. Results The corrosion rates of 316L stainless steel and Monel alloy in highly acidic desalted crude oil were 0. 0091 mm/a and 0. 0248 mm/a, respectively. And in weak acidic second fraction, the corrosion rates were 0. 0078 mm/a and 0. 0031 mm/a, respectively. In second fraction, after addition of 600 mg/L of chlorine ion and 30 mg/L of sodium sulfide, the corrosion rates of 316L stainless steel and Monel alloy were 0. 1755mm/a and 0. 1707 mm/a, respectively. Meanwhile, in the de-salted crude oil with the same concentrations of chloride ions and sulfide ions, the corrosion rate of 316L stainless steel was 0. 0545 mm/a and that of Monel alloy was 0. 1281 mm/a. Conclusion The results indicated that the naphthenic acid corrosion was the dominant factor when there was little chloride in oil phase and the chloride corrosion turned into the major factor if the content of chloride in oil was at high levels. The corrosion rates of the 316L stainless and Monel alloy raised with the increase of chloride ion concentration in oil phase. Furthermore, the existence of sulfur ions could accelerate corrosion in oil phase. In contrast, chloride and sulfur ions did not have apparent impact on the corrosion of Monel alloy in aqueous phase.关键词
炼油/316L不锈钢/Monel合金/腐蚀/氯离子/硫离子Key words
oil refining/316L stainless steel/Monel alloy/corrosion/chloride ions/sulfur ions分类
矿业与冶金引用本文复制引用
孙亮,侯艳宏,杨席,张志恒,朱元强,王虎,唐鋆磊..炼油加工过程中氯离子与硫离子对316L不锈钢和Monel合金腐蚀的影响[J].表面技术,2015,44(12):41-48,8.
