摘要
环烷酸含量及其温度是影响石油炼制设备腐蚀的主要因素，过去对其研究报道较少。采用高温反应釜中的挂片失重试验和表面腐蚀形貌微观分析，研究了20钢和321不锈钢在高温高浓度环烷酸中的腐蚀行为。结果表明，随着温度的升高，20钢和321不锈钢的腐蚀速率均先增大后减小，260℃以下反应速率主要受活化反应控制，280℃以上表面吸附成为控制步骤，260～280℃为混合控制；随环烷酸浓度的增加，20钢和321不锈钢的腐蚀速率增大；在环烷酸浓度低于2％时，20钢的腐蚀速率和环烷酸浓度为幂函数关系；当环烷酸浓度超过2％时，两者之间为线性关系。当环烷酸浓度低于3％时，321不锈钢基本不发生腐蚀；当环烷酸浓度超过3％时，腐蚀速率和环烷酸浓度为线性关系。在相同的条件下，321不锈钢的耐蚀性远优于20钢。
The corrosion behaviors of20 carbon steel and 321 stainless steel in concentrated naphthenic acid under high temperature were investigated based on dynamic weight loss measurement in a heated autoclave and scanning electron microscopic observation. Results revealed that the corrosion rates of 20 carbon steel and 321 stainless steel first increased andthen decreased with increasing temperature. The rate of reaction was determined by activation below 260 ℃,by surface absorption above 280 ℃,and by both mechanisms between 260 ℃ and 280℃. The corrosion rates of 20 carbon steel and 321 stainless steel increased as naphthenic acid concentration increased. The corrosion rate of 20 carbon steel was exponentially proportional to naphthenic acid concentration when the concentration was below2%,and it was linearly proportional to the naphthenic acid concentration when the concentration was above 2%. The 321 stainless steel was hardly corroded under 3% naphthenic acid concentration,and its corrosion rate was linearly proportional to the naphthenic acid concentration when the concentration was above3%. The corrosion resistance of 321 stainless steel was much better than that of 20 carbon steel under the same experimental conditions.
出处
《材料保护》
CAS
CSCD
北大核心
2014年第5期30-33,7-8,共4页
Materials Protection
基金
国家科技支撑计划(No.2011BAK06B01-01)资助
关键词
环烷酸腐蚀
321不锈钢
20钢
温度
环烷酸浓度
naphthenic acid
corrosion behavior
321 stainless steel
20 carbon steel
concentration
