Citation: HU Song-Qing, YU Li-Jun, YAN You-Guo, ZHANG Jun, REN Zhen-Jia, TI Yang. Experimental and Theoretical Study of the Synergistic Inhibitive Effect of SDBS and HA[J]. Acta Physico-Chimica Sinica, ;2011, 27(02): 275-280. doi: 10.3866/PKU.WHXB20110215 shu

Experimental and Theoretical Study of the Synergistic Inhibitive Effect of SDBS and HA

1.
College of Physics Science and Technology, China University of Petroleum, Dongying 257061, Shandong Province, P. R. China

Received Date: 23 June 2010
Available Online: 28 December 2010
Fund Project: 中国石油中青年创新基金(07E1021) (07E1021)山东省自然科学基金(Y2006B35)资助项目 (Y2006B35)

The synergistic inhibitive effect of sodium dodecylbenzene sulfonate (SDBS) and hexamethylene tetramine (HA) toward Q235 steel in hydrochloric acid was investigated by the static weight loss method. We also studied the inhibition mechanism by molecular dynamics simulations with regard to the inhibition of aggressive particle diffusion by inhibitor membranes. SDBS and HA were found to have individual inhibition efficiencies of 82.82% and 79.46%, respectively. These inhibition efficiencies increased to an efficiency of 92.78% when SDBS and HA were combined. Molecular dynamics simulations indicated that the free volume of the inhibitor membrane decreased significantly when SDBS and HA were used together compared with the case when they were used individually. Therefore, the self-diffusion of the inhibitor molecules becomes weaker and passive diffusion of the aggressive particles, which is caused by the mobility of the membrane, also decreases. The diffusion coefficient of the aggressive particles inside the inhibitor membrane shows that the diffusion of the aggressive particles is strongly hindered by the inhibitor membrane because of the synergistic effect between SDBS and HA and that the inhibition efficiency is enhanced.
- Sodium dodecylbenzene sulfonate,
- Hexamethylene tetramine,
- Weight loss method,
- Molecular dynamics simulation,
- Diffusion coefficient
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