CO_2和SRB共存产出水中咪唑啉衍生物的环境行为及缓蚀长效性研究

Corrosion Inhibition of Imidazoline for Carbon Steel in CO_2-saturated Artificial Sewages with Sulfate Reduction Bacteria

采用腐蚀失重法、三维显微镜和电化学方法研究咪唑啉在含有硫酸盐还原菌(SRB)的饱和CO2模拟水中的缓蚀行为,通过紫外分光光度法同步检测咪唑啉浓度变化,研究咪唑啉对SRB生长影响及通过Fourier红外分析咪唑啉残余物质结构。结果表明,缓蚀剂的添加抑制了SRB的生长,经过10 d的培养后,在有/无SRB的体系中缓蚀剂都具有很高的缓蚀性能,缓蚀率分别为93.0%和94.4%。在有/无SRB体系中的咪唑啉含量分别减小为86.5%和87.5%,红外分析表明残余物质含有咪唑啉的五元环结构特征峰,咪唑啉缓蚀剂不会因SRB生长而使特征官能团断开,其缓蚀性能具有长效性。

The inhibition behavior of imidazoline on carbon steel in CO2-saturated artificial sewages with sulfate reduction bacteria(SRB) was investigated by weight loss method, 3D microscope and electrochemical methods. The concentrations of imidazoline were measured by UV- visible spectrophotometer,then the breeding of SRB was studied by measuring the amount of bacteria and the molecular structure of residual materials of imidazoline was characterized by FTIR. The results showed that: imidazoline could inhibit the breeding of SRB and imidazoline exhibited rather high inhibition efficiency in the artificial sewages without and with SRB after 10 d of incubation, correspondingly the contents of imidazoline were reduced to 87.5% and 86.5% for the two cases. The FTIR showed that characteristic peaks of pentacyclic compounds in the infrared spectra of the imidazoline residue could be observed, which implied that the functional groups of imidazoline were not destroyed by SRB during the corrosion process. Therefore, the imidazoline could act as inhibitor in the presence of the SRB for long term.