A comprehensive study on crude methanolic extract of Artemisia pallens (Asteraceae) and its active component as effective corrosion inhibitors of mild steel in acid solution

作者：Garai Subhadra; Garai Saraswati; Jaisankar Parasuraman; Singh J K; Elango Adirajan

来源：Corrosion Science, 2012, 60: 193-204.

DOI：10.1016/j.corsci.2012.03.036

• Mild steel
• Weight loss
• Raman spectroscopy
• XPS
• IR spectroscopy
• Acid inhibition

Corrosion inhibition effects of crude methanolic extract of Artemisia pallens on mild steel in 1 mol l(-1) HCl were studied by weight loss and electrochemical technique. Arbutin. an active principle from A. pallens and the crude methanolic extract exhibited inhibition efficiency of 93% and 98% in 400 mg l(-1) concentration at 30 degrees C respectively. The results indicated that arbutin in acidic medium acted as good anti-corrosive agent synergistically with its hydrolyzed products hydroquinone and D-glucose. Adsorption of both the inhibitors on mild steel surface conformed to the Langmuir isotherm with standard adsorption free energy of -33.07 kJ mol(-1) for arbutin.

• 出版日期2012-7