In order to better slow down the corrosion of metal under high temperature acidification in oil and gas fields,a compound acidizing corrosion inhibitor with high temperature resistance and simple formula was investigated.A novel fused heterocyclic quaternary ammonium salt(BQD)was prepared by'one-pot'reaction with quinoline and benzyl chloride as raw materials.A novel high temperature acidizing corrosion inhibitor GS-1 with simple formula was obtained by weight loss method optimization of single factor analysis with synthetic BQD as the main agent,adding formic acid,urotropine and other compound agents.At the same time,its inhibition performance was studied by electrochemical test,surface morphology analysis and quantum chemical calculation.And the inhibition mechanism of BQD was studied by molecular simulation.The results showed that when the dosage of GS-1 corrosion inhibitor was 3％,the corrosion rates of N80 steel sheets in hydrochloric acid and mud acid at 160℃ were 41.63g/(m2·h)and 31.94g/(m2·h),respectively,which were better than the requirements of industry standards.The high temperature inhibitor GS-1 could form an adsorption protective film on the surface of N80 steel sheets,which could inhibit the mixed corrosion inhibitor of anode and cathode reaction at the same time.Quantum chemical calculations and molecular dynamics simulations indicated that the corrosion inhibition activity of BQD was better than that of the common benzylquinoline quaternary ammonium salt corrosion inhibitor(BQC).At the same time,the BQD molecule was based on the conjugated plane and was adsorbed on the interface at an angle parallel to the metal substrate,which had more better inhibition performance.
关键词
新型稠杂环季铵盐/缓蚀性能/高温酸化/腐蚀/电化学/量子化学计算/分子模拟
Key words
novel fused heterocyclic quaternary ammonium salt/corrosion inhibition performance/high temperature acidizing/corrosion/electrochemistry/quantum chemical calculation/molecular simulation
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