Abstract
This research work presents a study on the methanolic and aqueous extracts of corn silk for their corrosion inhibitive effect on mild steel in 0.5M HCl media at 303K, 313K and 323K using the weight loss method. Various concentrations of Corn Silk Methanolic Extract (CSME) and Corn Silk Aqueous Extract (CSAE) (0.1w/v, 0.2w/v, 0.3w/v, 0.4w/v and 0.5w/v) were prepared from the shadow-dried corn silk. Inhibition efficiency of 95.07%, 90.91%, 83.40%; and 79.43%, 72.55%, 66.30% was obtained respectively for CSME and CSAE at 303K, 313K and 323K for the highest concentration of extracts (0.5w/v). The Inhibition efficiency increased with increase in concentration of the extracts and decreased as temperature increased. The results obtained from both extracts were compared and it showed that the methanolic extract was a better inhibitor than the aqueous extract. From this present work, both extracts was shown to be most effective at 303K than at 313K and 323K. It was observed that both extracts inhibited the corrosion of mild steel in acidic media through physical adsorption by forming a barrier on the surface of the metal. Data obtained obeyed Langmuir adsorption isotherm. The Kinetic study of the process proposed a first order reaction type. The usefulness of a waste material as corrosion inhibitor is once more reported.
Highlights
As defined by Popoola et al, (2013) corrosion is the deterioration of metal due to its relationship with the enclosing environment
The aim of this work is to compare the effectiveness of corn silk methanolic extract (CSME) with corn silk aqueous extract (CSAE) as corrosion inhibitor for mild steel in 0.5M HCl medium at 303K, 313K, and 323K
In this work weight loss of mild steel coupons immersed in 0.5M HCl was periodically measured to ascertain the corrosion rate in the acidic medium
Summary
As defined by Popoola et al, (2013) corrosion is the deterioration of metal due to its relationship with the enclosing environment. Metallic corrosion is of practical concern because of the increased use of strong acid attacking equipment surface during Industrial applications (acid cleaning, pickling, descaling, oil well acidizing operations, and in the refining of crude oil) (Ostovari et al, 2009) This process causes damage to the metal in the long run and has to be prevented or controlled. The antioxidant property of the plant material is due to the presence of many active phytochemicals including vitamins, flavonoids, tereponoids, carotenoids, cumarins, lignin, plant sterol etc which are believed to be in different parts of the plants e.g. fruits, leaves, stem, roots etc as reported by different researches and some economic plants have been reported (Rehan 2003) This forms the basis of utilization of plant materials that are of less economic importance, or regarded as waste material as these would find use for these and make the environment greener. The aim of this work is to compare the effectiveness of corn silk methanolic extract (CSME) with corn silk aqueous extract (CSAE) as corrosion inhibitor for mild steel in 0.5M HCl medium at 303K, 313K, and 323K
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