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中国腐蚀与防护学报  2015, Vol. 35 Issue (2): 122-128    
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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 wordsnaphthenic 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

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

Material C Cr Ni Mo Mn Si P S Fe
Q235 0.14 --- --- --- 0.41 0.10 0.017 0.038 Bal.
Cr5Mo 0.095 4.65 0.11 0.43 0.31 0.09 0.013 0.0036 Bal.
表1  Q235钢和Cr5Mo钢的化学成分
Item TAN / mg KOHg-1 Sulfide content / % Density / gcm-3
Secondary vacuum gas oil 3.3 0.17 0.896
Naphthenic acid 177 --- 0.972
Dimethyl disulphide --- 68 1.063
Refined oil 0.04 0.037 0.867
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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