Polyamino‐Benzoquinone Polymers: A New Class of Corrosion Inhibitors for Mild Steel

Abstract

A new class of corrosion inhibitors, namely, polyamino-benzoquinone (PAQ) has been synthesized and its inhibiting action on the corrosion of mild steel in 1N H2SO, and 1N HC1 has been investigated by various corrosion monitoring techniques. A preliminary screening of the inhibition efficiency of the polymer was carried out by self corrosion studies. PAQ is found to behave better in 1N H2SO, than 1N HC1. Potentiodynamic polarization studies clearly reveal the fact that PAQ is a mixed-type inhibitor. PAQ is able to reduce considerably the permeation current through the steel surface in both the acids. Changes in impedance parameters (R~t and C~) are indicative of adsorption of PAQ on the metal surface leading to the formation of a protective film which grows with increasing exposure time. The adsorption of this polymer is also found to obey Temkin's adsorption isotherm in both acids thereby indicating that the main process of inhibition is by adsorption. UV spectral studies were also carried out to establish the actual mechanism of inhibition of corrosion.

Mitigation of corrosion of carbon steel in acidic solutions using an aqueous extract of Tilia cordata as green corrosion inhibitor

“…Moreover, a thin protective layer is formed and evenly distributed on carbon steel surface. This corroborates the involvement of plant extract molecules in blocking the corrosion cells on carbon steel surface by decreasing the contact between carbon steel surface and the corrosive solution that sequentially inhance the inhibition characteristics and show better corrosion protection for the metal surface [40,41].…”

Sweet Corrosion Inhibition on API 5L-B Pipeline Steel

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“…The decrease in corrosion rate of aluminum sample by adding the Olive Seeds may be due to the adsorption of components of the extract on the aluminum surface or to form a protective barrier layer which separate the aluminum surface from the center of corrosion [23,24].…”

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