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Tryptamine as a corrosion inhibitor of mild steel in hydrochloric acid.pdf

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Tryptamine as a corrosion inhibitor of mild steel in hydrochloric acid

Corrosion Science 52 (2010) 30–36Contents lists available at ScienceDirect Corrosion Science journal homepage: www.elsevier .com/locate /corsc iTryptamine as a corrosion inhibitor of mild steel in hydrochloric acid solution Pongsak Lowmunkhong, Dusit Ungthararak, Pakawadee Sutthivaiyakit * Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10903, Thailanda r t i c l e i n f o Article history: Received 12 March 2009 Accepted 11 August 2009 Available online 20 August 2009 Keywords: A. Mild steel B. EIS B. Polarization C. Acid inhibition0010-938X/$ - see front matter 2009 Elsevier Ltd. A doi:10.1016/j.corsci.2009.08.039 * Corresponding author. Address: Department of Innovation in Chemistry, Faculty of Science, Kasetsa Road, Bangkok 10903, Thailand. Tel.: +66 2 5625555x22 E-mail address: fscipws@ku.ac.th (P. Sutthivaiyakia b s t r a c t The inhibitor effect of tryptamine on the corrosion of mild steel in 0.5 M hydrochloric acid at 30 C was investigated using linear polarization, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The inhibition efficiency increases with an increase in concentration of tryptamine. At 500 ppm tryptamine the inhibition efficiency calculated by these techniques is around 97%. Cathodic and anodic polarization curves of mild steel in the presence of different concentrations of tryptamine at 30 C reveal that it is a mixed type inhibitor. Tryptamine follows Langmuir adsorption with adsorption free energy of 35.07 kJ mol1. 2009 Elsevier Ltd. All rights reserved.1. Introduction Mild steel in acid solution is widely used in various industrial processes and corrosion of mild steel known to occur in this envi- ronment [1,2]. One of the effective methods to prevent corrosion is the use of organic inhibitors [3]. Organic inhibitors react by adsorp- tion on a metallic surface. Water molecules at metallic surface are replaced by organic inhibitor