20#碳钢和321不锈钢在高温环烷酸中的腐蚀行为  

Corrosion Behavior of Carbon Steel and 321 Stainless Steel in Naphthenic Acid at High Temperature

作　　者：胡洋[1,2] 程学群[1] 周建龙[1] 张新[1] 李晓刚[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国石油化工股份有限公司齐鲁分公司,淄博255434

出　　处：《腐蚀与防护》2010年第10期775-777,共3页Corrosion & Protection

摘　　要：高温环烷酸腐蚀是加工高酸原油过程中主要的腐蚀问题,温度和环烷酸浓度对其影响很大。本工作采用动态高温反应釜研究了不同温度和环烷酸浓度下20#碳钢和321不锈钢的腐蚀行为。结果表明,两种材质在环烷酸中的腐蚀速率随温度升高均呈现先增加后减小的规律。在环烷酸浓度为5%时,碳钢在280℃时腐蚀速率最高,而321不锈钢在260-280℃时腐蚀速率最高。在280℃时,随环烷酸浓度的增大,两种材料的腐蚀速率急剧增加,但浓度对两种材料的腐蚀速率加速比不同。在一定的环烷酸浓度下,两种材料的腐蚀速率发生突跃,对于20#碳钢,在环烷酸浓度1.5%-2%时存在一个腐蚀突跃区,而321不锈钢的腐蚀突跃区在环烷酸浓度为3%-5%之间。Naphthenic acid corrosion is a main corrosion problem in processing of crude oil with high acid values,and the temperature and concentration of naphthenic acid may have great effect on the corrosion.A dynamic high pressure reactor was used to investigate the corrosion behavior of 20# carbon steel and 321stainless steel（SS） under the condition of different temperatures and different concentrations of naphthenic acid.The results showed that the corrosion rate of the two materials had a maximum at a certain temperature.When concentration of the naphthenic acid was 5%,the corrosion rate of carbon steel reached the maximum at 280 ℃,and the corrosion rate of 321SS reached the maximum at the range of 260~280 ℃.At 280 ℃,the corrosion rate of the two materials increased sharply with increasing the concentration of naphthenic acid,but the speedup factors were different.The corrosion rate of the two materials in naphthenic acid had a leap range at certain concentration,for carbon steel,the concentration range was between 1.5% to 2%,for 321SS,it was between 3% to 5%.

关 键 词：环烷酸腐蚀 20#碳钢 321不锈钢 温度 浓度 

分 类 号：TG172.6[金属学及工艺—金属表面处理]