Inhibition Behavior of Dodecylamine Inhibitor in Oilfield Produced Water Containing Saturated CO₂ and SRB

The short-term corrosion inhibition performance of dodecylamine for 20# carbon steel in the presence of saturation CO2 and sulfate-reducing bacteria (SRB) was investigated by electrochemical impedance spectroscopy (EIS),potentiodynamic polarization,weight loss method and three-dimensional stereogram.The results showed that the corrosion inhibitor exhibited high inhibition efficiency,reaching 95.8% in the absence of SRB.After inoculating 10% SRB and cultivating for 11 days at stationary temperature,when the concentration of corrosion inhibitor was less than 20 mg/L,the corrosion inhibition performance was worse;when the concentration of corrosion inhibitor reached 100 mg/L,the inhibition efficiency could reach 85.2% depending on weight loss method.The SRB content measurements indicated that the corrosion inhibitor had toxicity for SRB and could inhibit the growth of SRB.The corrosion morphology of specimens indicated that the specimen produced uniform corrosion accompanied by pitting corrosion in the presence of SRB and CO2;when adding 100 mg/L corrosion inhibitor,the corrosion of specimen was lighter,and accompanied by a little pitting corrosion.