CMC掺杂态聚苯胺在油田回注水中对碳钢的缓蚀性能研究

Corrosion Inhibition of CMC-Doped Polyaniline for Mild Steel in Oilfield Water Injection

郭 英 侯元春 刘 波 卢 浩

GUO Ying HOU Yuan-Chun LIU Bo LU Hao

采用化学氧化法合成了羧甲基纤维素（CMC）掺杂态聚苯胺（PANI）；用傅立叶红外光谱(FTIR)对合成产物进行表征；采用电化学交流阻抗和动电位极化方法研究了PANI在油田回注水中的缓蚀性能。结果表明：PANI在油田回注水中对Q235钢的缓蚀效率随其浓度的增大而增大，PANI质量浓度为0.4 g/L时的缓蚀效率为90.8%；PANI是一种阴极型缓蚀剂，在回注水中对Q235钢的缓蚀作用机理为“几何覆盖效应”；CMC的掺杂是提高缓蚀性能的重要原因。

Carboxymethyl cellulose (CMC) doped polyaniline was synthesizedby chemical oxidation method. The product was characterized by FTIR absorption spectra. The corrosion inhibition performance, the film formation and destruction, and the corrosion protection mechanism of PANI as a steel corrosion inhibitor in oilfield water injection were measured by polarization technique and electrochemical impedance spectroscopy. Experiment results indicated that the inhibition efficiency in oilfield water injection increased with increasing concentration of PANI. The inhibition efficiency reached 90.8% when the concentration of PANI was 0.4 g/L. PANI was one kind of cathodic corrosion inhibitor. The corrosion mechanism of PANI on Q235 steel in oilfield water injection was “effects of surface cover geometry”. CMC doping was an important reason to improve the corrosion performance.