Adsorption of Cowpea Husk Extract and Corrosion Inhibition at Interface between X80 Steel and Acidic Oilfield Descaling Fluid

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Abstract

Cowpea husk is an agro-industrial by-product that can be sustainable and cheaply obtained in large quantities. Ethanol extract of the husks (CWPE) was assessed as a corrosion inhibitor for X80 steel in 1 M HCl at 303 – 333 K under static weight loss and electrochemical conditions, accompanied by functional group (FTIR) and surface morphological (SEM) analyses. The inhibition efficiency of 94.6 % and 85.2 % were obtained at 303 and 333 K. CWPE acts as a mixed type corrosion inhibitor with a major influence on the anodic half-reaction and increases charge transfer resistance while decreasing double-layer capacitance and corrosion current density. Corrosion inhibition is attributed to spontaneous adsorption of CWPE phytocompounds on X80 steel surface best approximated by the Langmuir adsorption model. Adsorption is enabled mainly by O, N, and C=C sites affording surface protection and reduced pitting as observed by SEM. CWPE is a potential alternative corrosion inhibitor for X80 steel in mildly acidic environments.
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豇豆壳萃取物在X80钢与酸性油田除垢液界面的吸附及缓蚀作用
豇豆壳是一种可持续、廉价、可大量获取的农工业副产品。在静态失重和电化学条件下,通过官能团(FTIR)和表面形貌(SEM)分析,评价了谷壳乙醇提取物(CWPE)在1 M HCl中在303 ~ 333 K下作为X80钢的缓蚀剂。在303和333 K时,抑制率分别为94.6%和85.2%。CWPE作为混合型缓蚀剂,主要影响阳极半反应,增加电荷转移电阻,降低双层电容和腐蚀电流密度。CWPE植物化合物在X80钢表面的自发吸附是其缓蚀作用的主要原因,Langmuir吸附模型最接近该模型。扫描电镜观察到,O、N和C=C位点主要起到表面保护和减少点蚀的作用。CWPE是X80钢在弱酸性环境中潜在的缓蚀剂替代品。
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