含噻二唑季铵盐表面活性剂对Q235钢的缓蚀性能

Corrosion inhibition effect of a quaternary ammonium surfactant containing thiadiazole on Q235 steel

通过表面张力法研究一种含噻二唑季铵盐表面活性剂(MTOTB)在1 mol/L HCl溶液中的表面活性;通过电化学测试、静态失重和表面形貌分析研究MTOTB及相应的2-巯基-5-甲基-1,3,4-噻二唑(MMTD)在1 mol/L HCl溶液中对Q235碳钢的缓蚀性能。结果表明,MTOTB在1 mol/L HCl溶液中的临界胶束浓度为0.36 mmol/L;当添加浓度为0.5 mmol/L时,MTOTB对在1 mol/L HCl溶液中浸泡48 h碳钢片的缓蚀率可达95.34%,同样条件下,MMTD对碳钢的缓蚀率为78.34%,说明MTOTB对碳钢的腐蚀抑制效率显著优于MMTD。SEM-EDS表明,MTOTB可以吸附在碳钢表面,有效抑制碳钢片的腐蚀。

The surface activity of a quaternary ammonium surfactant(MTOTB)in 1 mol/L HCl solution was investigated by surface tension method.The corrosion inhibition performance of MTOTB and 2-mercapto-5-methyl-1,3,4-thiadiazole(MMTD)for Q235 carbon s t e e l in 1 m o l/L HCl solution was analyzed by electrochemical test,weight loss and surface morphology analysis.The results show that,the critical micelle concentration is 0.36 mmol/L for MTOTB in 1 mol/L HCl solution.The corrosion inhibition rate can reach 95.34%for the carbon steel soaked in 1 mol/L HCl solution for 48 h when adding 0.5 mmol/L MTOTB,while for MMTD it is 78.34%under the same condition,suggesting that MTOTB owns better corrosion inhibition performance than MMTD.The results of SEM-EDS show that MTOTB can adsorb on the surface of carbon steel and effectively inhibit the corrosion of carbon steel sheet.