THE INHIBITION AND ADSORPTION PROPERTIES OF DTPMP TSC ON STAINLESS STEEL IN ACIDIC MEDIUM

Authors

  • P. Selva kumar *Department of Chemistry, Chettinad College of Engineering and Technology, Karur, TN, India.

DOI:

https://doi.org/10.24297/jac.v6i1.6588

Keywords:

Corrosion inhibition, Stainless stee, ; Polarization, Adsorption isotherm, FTIR; SEM, AFM

Abstract

The inhibition effect of diethylenetriamine penta(methylene phosphonic acid) (DTPMP) and Trisodium Citrate (TSC) on the
corrosion behavior of stainless steel in 0.5 M H2SO4 solution was investigated by using weight loss method. The combined
corrosion inhibition efficiency offered 200 ppm of DTPMP and 150 ppm of TSC was 95%. Polarization study showed that
the inhibitors inhibit stainless steel corrosion through mixed mode and electrochemical impedance spectroscopy (EIS)
results confirm the adsorption of the inhibitors at stainless steel/acid interface. The adsorption of DTPMP and TSC onto
the stainless steel surface was found to follow Langmuir adsorption isotherm modes. Negative values of (ΔGads) in the
acid media ensured the spontaneity of the adsorption process. The nature of the protective film formed on the metal
surface has been analyzed by FTIR spectra, SEM and AFM analysis. The activation energy (Ea), free energy change
(ΔGads), enthalpy change (ΔHads) and entropy change (ΔSads) were calculated to understand the corrosion inhibition
mechanism.

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Published

2017-04-24

How to Cite

kumar, P. S. (2017). THE INHIBITION AND ADSORPTION PROPERTIES OF DTPMP TSC ON STAINLESS STEEL IN ACIDIC MEDIUM. JOURNAL OF ADVANCES IN CHEMISTRY, 6(1), 897–908. https://doi.org/10.24297/jac.v6i1.6588

Issue

Vol. 6 No. 1 (2013)

Section

Articles

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