Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Roland Tolulope Loto,Cleophas Akintoye Loto,Abimbola Patricia Popoola

doi:10.17159/0379-4350/2015/v68a16

Roland Tolulope Loto, Cleophas Akintoye Loto + Show 1 more

Open Access

https://doi.org/10.17159/0379-4350/2015/v68a16

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Abstract

The influence of deanol on the corrosion behaviour of mild steel in dilute sulphuric acid with sodium chloride addition was studied by means of mass-loss, potentiodynamic polarization, electrode potential monitoring, scanning electron microscopy and statistical analysis. Results show that deanol performed excellently with a maximum inhibition efficiency of 97.9 % obtained from the mass loss technique and 98.23 % from the potentiodynamic polarization tests at the maximum deanol concentration evaluated. Polarization studies show that the amino alcohol is a cathodic type inhibitor. Adsorption of deanol on the steel surface was observed to obey the Langmuir and Frumkin adsorption isotherms. Scanning electron microscopy studies confirmed the corrosion protection property of deanol to be through adsorption on the mild steel surface while statistical evaluation showed the overwhelming influence and significance of inhibitor concentration on inhibition efficiency compared with exposure time.

Highlights

Effective corrosion inhibition is subject to the chemical composition, molecular structure and affinity of the inhibiting compound with the metallic alloy surface
The compound adsorbs through concrete resulting in the formation of a complex precipitate of protective film, which adsorbs onto the metal surface
Mass-loss Measurements Mass-loss of mild steel at various time intervals, in the absence and presence of various MDMAE concentrations in 0.5 M H2SO4 acid at 25 °C was studied

Summary

Introduction

Deanol has been used for corrosion prevention in concrete with mixed results.[4,5,6,7] The compound adsorbs through concrete resulting in the formation of a complex precipitate of protective film, which adsorbs onto the metal surface This provides an impenetrable barrier to metal dissolution that acts to stifle cathodic and or anodic electrochemical corrosion reactions taking place at the metal/solution interface. This investigation aims to evaluate the corrosion inhibition properties of deanol on the electrochemical behaviour of mild steel in aqueous dilute sulphuric acid at ambient temperature of 25 °C

Experimental

Results and Discussion

Statistical Analysis

Conclusions