苯酚对典型承压装置材料的腐蚀行为研究

Behavior Studyon Corrosion of Typical Pressure Vessel Materials by Phenol

本文针对某石化企业的粗苯酚塔选材的工程问题,采用腐蚀失重法和电化学交流阻抗法对31603、30403两种不锈钢的母材和焊缝材料,以及Q345R碳钢的母材进行了的腐蚀行为和耐蚀程度研究,并对研究结果进行了综合分析。试验结果表明,在液化苯酚和90%笨酚水溶液中31603和30403两种不锈钢均具有较好的耐蚀性,其中31603的耐蚀性略好于30403,但差异很小。Q245R则在两种介质中均具有较快的腐蚀速率,其中90%的苯酚水溶液中的腐蚀速率相对更快,超过了0.05mm/a,约为在纯苯酚中的1.52倍。根据试验结果,30403与31603两种材料均可成为该装置的备选材料,但考虑到经济成本,30403更佳。

This paper deals with the engineering problems of the selection of crude phenol tower in a petrochemical enterprise.Corrosion weight loss method and electrochemical AC impedance method were used to study the corrosion behavior and degree of corrosion resistance of base metal and weld material of 31603 stainless steel and 30403 stainless steel,and base material of Q345R carbon steel,and the results of the study were comprehensively analyzed.The results show that both 31603 and 30403 stainless steels have good corrosion resistance in liquefied phenol and 90% phenol aqueous solution,and the 31603 was slightly better than 30403 by corrosion resistance,but the difference was very small.The Q245R has a fast corrosion rate in both types of media.The corrosion rate of Q245R in 90% phenol aqueous solution was faster than liquefied phenol,the Corrosion rate of over 0.05 mm·a-1,the Corrosion rate of Q245R in 90% phenol aqueous solution was about 1.52 times as much in pure Phenol.According to the test results,both 30403 and 31603 materials can be used as alternative materials for the device,but 30403 is better than 31603 in the economic cost.