模拟炼油环境中Q235钢和Cr5Mo钢表面硫化物膜稳定性及动态冲刷腐蚀行为研究

中国腐蚀与防护学报

2015, Vol. 35

Issue (2): 122-128

本期目录 | 过刊浏览

模拟炼油环境中Q235钢和Cr5Mo钢表面硫化物膜稳定性及动态冲刷腐蚀行为研究

刘贵群¹, 郑玉贵¹(

), 姜胜利¹, 荆军航², 董伟娟², 曾宏², 司品宪²

1. 中国科学院金属研究所核用结构材料与安全性评价重点实验室沈阳 110016
2. 中国石油天然气股份有限公司锦西石化分公司研究院葫芦岛 125001

Stability and Erosion Corrosion Behavior of Corrosion Product Film of Q235 Carbon Steel and Cr5Mo Low Alloy Steel in Simulated Oil Refinery Media

LIU Guiqun¹, ZHENG Yugui¹(

), JIANG Shengli¹, JING Junhang², DONG Weijuan², ZENG Hong², SI Pinxian²

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Jinxi Petrochemical Company, Petro China, Huludao 125001, China

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摘要:

通过静态浸泡腐蚀实验装置和高温动态冲刷实验装置分别研究了硫化物膜在多种模拟炼油介质中的稳定性以及动态冲刷条件下Q235钢和Cr5Mo钢的耐冲刷腐蚀性能。结果表明,硫化物膜的形成过程是一个动态平衡过程。在无硫补充的条件下,硫化物膜快速溶解。动态冲刷作用下,Cr5Mo钢耐动态环烷酸冲刷腐蚀性能明显好于Q235钢,溶液酸值越大两者的差别越明显。

关键词 ：环烷酸腐蚀, 减二线馏分油, 硫化物膜, 冲刷腐蚀

Abstract：

Increasing demand on the oil market has raised interest in oils with high naphthenic acid content. These oils were previously considered of lower quality due to their corrosive characteristic. Although naphthenic acids corrosion (NAC) has been studied for many years, the mechanism of NAC is not fully understood yet. In this work, the stability of corrosion product films formed on Q235 carbon steel and Cr5Mo low alloy steel in second vacuum side distillates were studied with a high temperature static immersion apparatus. While the erosion corrosion behavior of the corrosion product films in simulated oil refinery media with various total acid number (TAN) and sulfur content was investigated by means of a high temperature and high flow rate NAC simulation device. The results showed that the formation and dissolution of the corrosion product films are on dynamic equilibrium state. The corrosion product films could be easily dissolved in the sulfide-free and naphthenic acid-containing refined oil. Under flowing conditions, corrosion resistance of Q235 carbon steel is much lower than that of Cr5Mo steel, and their difference becomes more obvious with the increase of TAN. The element Cr in Cr5Mo alloy plays a very important role to form the corrosion product film of chromium sulfide, which exhibits much better protectiveness rather than the film formed on Q235 carbon steel.

Key words： naphthenic acid corrosion (NAC) second vacuum side distillate sulphide film erosion corrosion

收稿日期: 2014-04-24

ZTFLH:

TG174.4

作者简介: null

作者简介：刘贵群，男，1984 年生，博士生

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引用本文:

刘贵群, 郑玉贵, 姜胜利, 荆军航, 董伟娟, 曾宏, 司品宪. 模拟炼油环境中Q235钢和Cr5Mo钢表面硫化物膜稳定性及动态冲刷腐蚀行为研究[J]. 中国腐蚀与防护学报, 2015, 35(2): 122-128.
Guiqun LIU, Yugui ZHENG, Shengli JIANG, Junhang JING, Weijuan DONG, Hong ZENG, Pinxian SI. Stability and Erosion Corrosion Behavior of Corrosion Product Film of Q235 Carbon Steel and Cr5Mo Low Alloy Steel in Simulated Oil Refinery Media. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 122-128.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2015/V35/I2/122

表1 Q235钢和Cr5Mo钢的化学成分

表2 实验介质的性质

图1 静态浸泡实验装置示意图

图2 动态冲刷腐蚀实验箱示意图

图3 无硫环烷酸油溶液浸泡前试样表面形貌图

图4 两种材料腐蚀产物膜截面图

图5 Cr5Mo钢表面腐蚀产物膜的截面EDS面扫描结果

图6 Q235钢和Cr5Mo钢表面硫化物膜生成过程示意图

图7 TAN=3.3时试样重量随测试时间的变化

图8 无硫环烷酸油溶液浸泡不同时间后试样表面形貌

图9 Q235钢和Cr5Mo钢的动态冲刷腐蚀速率图

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