《在盐酸介质中巴戟天树叶水性提取物对铝表面腐蚀抑制作用的影响（英文版）》.pdfVIP

Trans. Nonferrous Met. Soc. China 24(2014) 2704−2712 Effect of aqueous extract of leaves of Morinda tinctoria on corrosion inhibition of aluminium surface in HCl medium K. KRISHNAVENI, J. RAVICHANDRAN Post Graduate and Research Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore-641020, Tamilnadu, India Received 9 October 2013; accepted 13 January 2014 Abstract: The effect of Morinda tinctoria (MT) leaves extract on the corrosion inhibition of Al in acid medium was studied. The inhibition studies were carried out on Al in 0.5 mol/L HCl with the extract of leaves of MT using mass loss and electrochemical techniques. Parameters, such as concentration of the inhibitor, concentration of the acid, temperature and concentration of halide ions, were varied and optimized. Increase of the temperature and concentration of acid can decrease the performance of the inhibitor. Thermodynamic parameters show that the physisorption of the inhibitor molecules on Al surface obeys Langmuir isotherm. Key words: aluminium; mass loss; acid corrosion; inhibition; Morinda tinctoria the processing time, cost and their toxic nature have 1 Introduction compelled the researchers to look for eco-friendly, non- toxic and low cost inhibitors for the corrosion protection The corrosion inhibition process helps in reducing of metals. Many corrosion prevention works have been the safety and economic input of corrosion damage. Each carried