芳香希夫碱在油田采出水中的缓蚀性能研究

目的研究不同复配型芳香希夫碱缓蚀剂在油田采出水中对N80碳钢的缓蚀效果。方法采用静态失重和旋转挂片实验比较四种芳香希夫碱的缓蚀速率,采用电化学测试、扫描电镜和EDS手段对N80碳钢进行表征和分析。结果在油田采出水中添加芳香希夫碱复配型缓蚀剂后,试样表面生成以铁、碳、氧元素为主的保护膜,当四种缓蚀剂的添加量达到90 mg/L时,N80碳钢的腐蚀速率下降趋势变化缓慢,a型缓蚀剂的缓蚀效果最好,其用量为90 mg/L时,N80碳钢的腐蚀速率降低到0.0087 mm/a,自腐蚀电位由-0.8112V提高到-0.7345 V,自腐蚀电流由77.79μA下降到5.410μA,缓蚀率可达到93.05%。结论四种希夫碱复配缓蚀剂均有较好的缓蚀性能,缓蚀剂的缓蚀效果顺序为abdc。

Corrosion Inhibition of Aromatic Schiff Base in Oilfield Water

The work aims to study corrosion inhibition effect of different composite aromatic Schiff base corrosion inhibitor for N80 steel in oilfield water. The inhibiting rate of four kinds of composite Schiff base was compared by static weight- loss and dynamic weight-loss methods. The corrosion inhibition effect of composite Schiff base in oilfield water was characterized by electrochemical test, scanning electron microscope and EDS. A layer of protective film mainly consisting of iron, carbon and oxygen elements formed on surface of the sample with composite aromatic Schiff added to the oil field water. The corrosion rate decreased slowly as addition of four corrosion inhibitors reached 90 mg/L. The inhibiting efficiency of type a was the best among all corrosion inhibitors. Provided that 90 mg/L was consumed, corrosion rate of N80 carbon steel reduced to 0.0087 mm/a, self-corrosion potential increased from -0.8112 V to -0.7345 V, self-corrosion current reduced from 77.79μA to 5.410μA and inhibiting rate reached 93.05%. All four composite Schiff base composite corrosion inhibitor show good inhibiting effi-ciency for N80 steel in oilfield water with order of inhibiting efficiency as: a>b>d>c.