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  

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

作　　者：刘贵群 郑玉贵[1] 姜胜利[1] 荆军航[2] 董伟娟[2] 曾宏[2] 司品宪[2] 

机构地区：[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

出　　处：《中国腐蚀与防护学报》2015年第2期122-128,共7页Journal of Chinese Society For Corrosion and Protection

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。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 Cr5 Mo 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 Cr5 Mo steel, and their difference becomes more obvious with the increase of TAN. The element Cr in Cr5 Mo alloy plays a very important role to form the corro-sion product film of chromium sulfide, which exhibits much better protectiveness rather than the film formed on Q235 carbon steel.

关 键 词：环烷酸腐蚀 减二线馏分油 硫化物膜 冲刷腐蚀 

分 类 号：TG174.3[金属学及工艺—金属表面处理] TG142.1[金属学及工艺—金属学]