一种基于碳原子点缓蚀剂的制备及性能评价

Preparation and Performance Evaluation of a Kind of Corrosion Inhibitor Based on Carbon Atoms

CO_(2)驱油引起的腐蚀是石油工业中一种比较常见的腐蚀类型,缓蚀剂的研发与应用可以有效抑制金属设备的腐蚀。以乙二胺四乙酸二钠水合物、氨基磺酸和六亚甲基四胺为原料,用微波法制备出一种基于碳原子点结构的缓蚀剂NCOS,通过在饱和CO_(2)的3%NaCl溶液中对其缓蚀性能进行研究。通过SEM、静态失重试验和电化学测试分析其缓蚀性能。结果表明:NCOS具有类球形结构,且有比较好的水溶液分散性,其直径约在4~8 nm之间;静态失重试验中,当NCOS加量为600 mg·L^(-1)时,腐蚀速率为0.09 mm·a^(-1),其缓蚀率达到83.5%;电化学测试中,NCOS加量为600 mg·L^(-1)时,腐蚀电流密度降低为50.40μA·cm^(-2),缓蚀速率达到83.8%。缓蚀剂分子主要是通过抑制阴极发生析氢反应来实现高缓蚀效率,达到减缓腐蚀进程的目的。

Corrosion caused by CO_(2)flooding is a relatively common type of corrosion in the petroleum industry.The development and application of corrosion inhibitors can effectively inhibit the corrosion of metal equipments.In this paper,disodium ethylenediaminetetraacetic acid hydrate,sulfamic acid and hexamethylenetetramine were used as raw materials to prepare a corrosion inhibitor NCOS based on the carbon atom point structure by microwave method.Its corrosion inhibition performance was investigated in the solution.Its corrosion inhibition performance was analyzed through SEM,static weightlessness test and electrochemical test.The experimental results showed that,NCOS had spherical structure,and had relatively good aqueous solution dispersibility,and its diameter was between 4~8 nm;in the static weight loss test,when the NCOS dosage was 600 mg·L^(-1),the corrosion rate was 0.09 mm·a^(-1),the corrosion inhibition rate reached 83.5%.In the electrochemical test,when the NCOS dosage was 600 mg·L^(-1),the corrosion current density decreased to 50.40μA·cm^(-2),and the corrosion inhibition rate reached 83.8%.Corrosion inhibitor molecules mainly achieve high-efficiency corrosion inhibition efficiency by inhibiting the hydrogen evolution reaction at the cathode to achieve the purpose of slowing down the corrosion process.