Effect of acid additives on anticorrosive property of henna in regular mud acid

Abstract

Many acid additives are used during acidizing treatment in order to prevent excessive corrosion, prevent sludge and emulsions, prevent iron precipitation, improve cleanup, improve coverage of the zone, and prevent precipitation of reaction products. Foremost among acid additives are corrosion inhibitors; therefore compatibility of other additives with corrosion inhibitor is very critical to the success of acidizing treatment. Any additive that alters the tendency of the corrosion inhibitor to adsorb on casing and tubing will also change its effectiveness. In present work, the inhibitive action of henna extract on corrosion of N80 API steel in regular mud acid (HCL/HF 12/3 wt%) at 28 °C was investigated through electrochemical technique. After determining the optimum concentration of henna extract, effect of acid additives on inhibitive action of henna extract on corrosion behavior of N80 steel in regular mud acid was investigated through polarization measurement and electrochemical impedance spectrometry methods. Inhibition efficiency of henna extract as a corrosion inhibitor for N80 API steel in regular mud acid at 28 °C is 85.98% (average of three methods). The results show that except iron control additive, all additives decrease the performance of henna extract as corrosion inhibitor.