Biodegradable Aquatic Waste-Fish Scales as Corrosion Inhibitor for Mild Steel in Acid Medium

DOI : http://dx.doi.org/10.13005/msri/050216

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Corrosion control methods, especially the use of inhibitors, have gained monumental importance in the present scenario of expunging corrosion and the quest for eco-friendly reasons continues. To arrive at an inexpensive non-toxic, eco-friendly inhibitor formulations the present study on the use of aquatic waste – fish scale extract has been carried out by the classical weight loss measurements and electrochemical polarization measurements. The acid extract could bring out a maximum of 96.5% inhibition of mild steel corrosion in 0.5M H2SO4.The extract was temperature resistant. Thermodynamic parameters of the corrosion process were calculated from temperature study. The absorptive behaviour of fish extract in acid solution may be approximated both by Langmuir and Tempkin type isotherms. The results obtained by Tafel, Linear polarization resistance and impedance spectroscopy have been correlated with the classical weight loss measurements. Values of Tafel constant ba and bc confirmed that the fish scale extract acts like mixed type inhibitor. The fish scale extract in H2SO4 medium efficiently inhibits the corrosion and proved to be zero cost inhibitor, eco-friendly, non-toxic and highly economical.

Biodegradable aquatic waste-fish scales; corrosion inhibitor