摘要
采用失重法、极化曲线法、电化学阻抗谱、电导法和表面张力法研究了苯并三氮唑(BTA)对冷轧钢在最大腐蚀浓度20%乙酸(HAc)溶液中的作用及机理。结果表明,BTA在此环境中具有表面活性,是一种阳极为主混合型缓蚀剂,缓蚀率随着BTA浓度升高而增大,400mg/L时达到最大,之后具有下降趋势。最大缓蚀率出现在BTA的临界胶束浓度附近,形成胶束之前以单分子化学吸附为主,是自发、放热、熵减小的过程,形成胶束后,继续加大BTA浓度,剩余BTA阳离子与反粒子Ac-形成胶束聚集体。BTA与HAc产生竞争吸附,温度升高,有利于BTA化学吸附过程。
The action and mechamism of benzotriazole(BTA)on cold rolled steel(CRS)in 20% acetic acid(HAc)with maximum corrosive concentration were investigated by tests of weight loss,polarization,electrochemical impedance spectroscopy,conductance and surface tension.The results revealed that BTA had surface activity and was an anodic controlled mixed-type inhibitor for CRS in 20% HAc,and the inhibition efficiency increased with the concentration of BTAC(BTA)increasing,and reached a maximum when CBTA was 400mg/L,but above it,the corrosion rate had a gradual downtrend.The highest efficiency was present to the critical micelle of BTA.The adsorption of BTA was a spontaneous and exothermic process with entropy reducing and monolayer chemical adsorption before the formation of BTA micelles.After the formation of BTA micelles the CBTA continuously increasd and the remaining of BTA cations formed micelles aggregated with Ac-.There was a process of competitive adsorption among BTA and HAC.Temperature rising was beneficial to chemical absorption process of BTA.
出处
《腐蚀与防护》
CAS
北大核心
2014年第7期651-656,共6页
Corrosion & Protection
基金
国家自然科学基金(51161025)
云南省自然科学基金(2011FZ173)
云南省绿色化学与功能材料研究省创新团队(2011HC008)
云南省教学改革项目(201327)
云南省高校绿色新能源与材料科技创新团队(2011UY09)
院大学生(本科组)创新性实验项目(2011HX05)
关键词
冷轧钢
乙酸
苯并三氮唑
缓蚀
胶束
竞争吸附
cold rolled steel
acetic acid(HAc)
benzotriazole(BTA)
corrosion inhibition
micelle
competitive adsorption
