松香酰胺基多巴胺的合成及缓蚀性能评价

Synthesis and Corrosion Inhibiton Performance Evaluation of Rosin Amide Base Dopamine

以松香和多巴胺为原料合成了一种新型油田注水缓蚀剂——松香酰胺基多巴胺。考察反应物配比和反应时间对产率的影响;利用静态失重法评价其缓蚀性能并通过电化学、吸附热力学及扫描电镜对其作用机理进行研究。实验结果表明,松香酰胺基多巴胺的最佳合成条件为:室温下,松香与多巴胺的摩尔比为1∶1.20、反应时间为24 h;在60℃下,矿化度为54 303 mg/L的腐蚀介质中当缓蚀剂质量浓度为150 mg/L时,N80钢片的腐蚀速率降至0.062 1 mm/a,缓蚀率达65.97%。电化学测试表明了该缓蚀剂属于抑制阴极型为主的混合型缓蚀剂,在金属表面的吸附自发进行,吸附符合Frumkin等温式,吸附类型为化学吸附。

A new type of oilfield water injection corrosion inhibitor,rosin amide base dopamine,was synthesized using rosin and dopamine. The effects of raw material ratio and reaction time on the yield were studied. The corrosion inhibition performance of the product was evaluated by static weightlessness method,and the corrosion inhibition mechanism of it was studied by electrochemistry,thermodynamics and SEM. The experimental results show that the optimum synthesis conditions of rosin amide base dopamine were as follows： the ratio of rosin to dopamine at room temperature is 1∶ 1. 20,the reaction time is 24 h. At 60 ℃,when the mass concentration of the corrosion inhibitor in corrosion medium with a salinity of 54 303 mg/L is 150 mg/L,the corrosion rate of N80 steel in the medium was reduced to 0. 062 1 mm/a,and the corrosion inhibition rate is 65. 97%. The electrochemical test reveals that the inhibitor mainly inhibits cathode reaction,and it is a mixed type inhibitor. The research also indicates that the adsorption of the inhibitor on N80 steel is in agreement with Frumkin adsorption isotherm,and the inhibitor molecule is spontaneously adsorbed into N80 steel surface. In addition,chemisorption is the predominant mode of adsorption.