Abstract
The inhibition efficiency of aqueous extract of propolis on the corrosion of carbon steel in 35 ppm aluminum sulfate and 10 ppm chloride solution was investigated by weight loss and electrochemical measurements. The corrosion rate of carbon steel and the inhibition efficiency of the propolis were calculated. The results obtained showed that propolis could serve as an effective inhibitor for the corrosion of carbon steel in aqueous media. Inhibition was found to increase with increasing concentration of the extract. The inhibitive action of propolis is discussed on the basis of adsorption of stable complex at the carbon steel surface. Theoretical fitting of different isotherms, Langmuir was tested to clarify the nature of adsorption. Potentiodynamic polarization curves revealed that this extract acts as a mixed type inhibitor and the inhibition efficiency of up to 92% can be obtained. Key words: Corrosion inhibition, propolis extract, carbon steel, 35 ppm aluminum sulfate and 10 ppm chloride solution.
Highlights
Carbon steel is widely used in industries due to its good mechanical property
The curves obtained shows that the weight loss of carbon steel in presence of inhibitor is lower than free inhibitor and decreases with increasing inhibitors concentrations (Bentiss et al, 2002)
The following conclusions were made from the following studies: 1. The corrosion rate of carbon steel in surface water decreases with increase in concentration of propolis
Summary
Carbon steel is widely used in industries due to its good mechanical property. Carbon steel has been extensively used under different conditions in chemical and allied industries in handling alkaline, acid and salt solutions. Several investigations have been reported using such naturally occurring substances as corrosion inhibitor for several metals in different media (Arora et al, 2007; Al-Sehaibani, 2000; Chaieb et al, 2005; Chaieb et al, 2004; Chauhan and Gunasekaran 2007; El-Etre et al, 2005; Olusegun et al, 2004; Orubite et al, 2004; Rehan, 2003; Saratha et al, 2003a,b; 2007; Sheyreese et al, 2005; Smita and Mehta, 1999; Akshay and Swami 2011; Lakshmi et al, 2012; Baban and Milind, 2011; Yadav et al, 2012; Senhaji et al, 2013; Belkhaouda et al, 2013a,b,c; Sennhji et al, 2013; Afia et al, 2012; Senhaji et al, 2013)
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