Polyamino-benzoquinone polymers: A new class of corrosion inhibitors for mild steel

Journal Article · Mon May 01 04:00:00 EDT 1995 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.2048599· OSTI ID:63189

Muralidharan, S; Phani, K L.N.; Pitchumani, S; Ravichandran, S; Iyer, S V.K. ^[1]

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1. Central Electrochemical Research Inst., Karaikudi (India)

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 H{sub 2}SO{sub 4} and 1N HCl 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 H{sub 2}SO{sub 4} than 1N HCl. 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{sub ct} and C{sub dl}) 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.

• Sponsoring Organization: USDOE
• OSTI ID: 63189
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 142; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMINES
BENZOQUINONES
CHEMICAL PREPARATION
CORROSION INHIBITORS
CORROSION PROTECTION
HYDROCHLORIC ACID
MOLECULAR STRUCTURE
ORGANIC POLYMERS
PERFORMANCE TESTING
PROTECTIVE COATINGS
REACTION KINETICS
STEELS
SULFURIC ACID