Extract of Angelica sinensis as oilfield corrosion inhibitor for mild steel in H₂SO₄ media

摘要

The root extract of Angelica sinensis (AS) was examined as potential corrosion inhibitor of mild steel in1 M sulphuric acid (H 2 SO 4 ) media using weight loss, electrochemical and surface studies. Angelicasinensis has its medicinal importance in Chinese traditional medicine since ancient time. It is used tocure several diseases and most important one includes the anemia in women. So, this medicinal herb ischosen as naturally friendly corrosion inhibitor for mild steel in sulphuric acid, as it is easily available,cheap and easy to use. The weight loss results discovered that samples covered with AS showed lessweight loss compared to the samples without AS. The electrochemical tests including electrochemicalimpedance spectroscopy (EIS), and potentiodynamic polarization (PDP) showed good mitigationefficiency of AS in 1 M H 2 SO 4 media. The mixed shift of the anodic and cathodic slopes advised thatthe AS represented as mixed category. The surface studies were completed using scanning electronmicroscopy (SEM) and contact angle. Both the studies displayed even surface in existence of AS andrough surface in its absence. The kinetic and thermodynamic parameters were also calculated. All theexperimental results are in decent pact respectively.