Two novel thiadiazole derivatives as highly efficient inhibitors for the corrosion of mild steel in the CO 2 -saturated oilfield produced water
Two novel thiadiazole derivatives as highly efficient inhibitors for the corrosion of mild steel in the CO 2 -saturated oilfield produced water
复制标题
两种新型噻二唑衍生物作为CO 2 饱和油田采出水中低碳钢腐蚀的高效抑制剂
DOI：
10.1016/j.jtice.2018.11.022
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发表时间：
2019
影响因子：
5.7
通讯作者：
Zhang G A
中科院分区：
文献类型：
--
作者：
Zhang Q H;Hou B S;Xu N;Liu H F;Zhang G A
在油气开采过程中，软钢管道的腐蚀一直是一个棘手的问题。本文合成了两种新型的噻二唑类化合物5-(苯硫基)-1，3，4-噻二唑-2-胺(BTTA)和5，5‘-二磺基双(1，3，4-噻二唑-2-胺)(DSTA)，作为低碳钢在CO2饱和的油田采出水中的缓蚀剂。通过电化学测试、表面表征、量子化学计算和分子动力学(MD)模拟研究了它们的缓蚀作用及其机理。结果表明，DSTA和BTTA均表现出较高的缓蚀效率。特别是对DSTA，即使在较低的浓度(0.0025 mM)下也能达到98.7%的缓蚀率，当浓度达到0.025 mM时，缓蚀率可达99.37%。在低浓度下，DSTA的缓蚀效果优于BTTA。这两种噻二唑类化合物均为混合型缓蚀剂，其在低碳钢表面的吸附符合Langmuir吸附等温式。根据实验结果和理论计算，讨论了BTTA和DSTA的缓蚀机理。
The corrosion of mild steel pipelines is a tough issue during the extraction of oil and gas. In this work, two novel thiadiazole derivatives, 5-(benzylthio)-1,3,4-thiadiazol-2-amine (BTTA) and 5,5′-disulfanediylbis (1,3,4-thiadiazol-2-amine) (DSTA), were synthesized as inhibitors for the corrosion of mild steel in the CO2-saturated oilfield produced water. Their inhibitive effects and mechanisms were studied by electrochemical measurements, surface characterization, quantum chemical calculations and molecular dynamics (MD) simulations. It is shown that both DSTA and BTTA exhibit high inhibition efficiencies. Especially for DSTA, the inhibition efficiency reaches 98.7% even in a fairly low concentration of 0.0025 mM, and reaches 99.37% with a concentration of 0.025 mM. DSTA presents a better inhibitive performance than BTTA in low concentration. These two thiadiazole derivatives act as mixed type inhibitors with predominant anodic effectiveness, and their adsorptions on mild steel surface follow the Langmuir adsorption isotherm. According to the experimental results and theoretical calculations, the inhibitive mechanisms of BTTA and DSTA are discussed.