A Combined Experimental and Theoretical Investigation on Pyrazolone Derivative as Corrosion Inhibitor for Mild Steel in 0.5 M Sulphuric Acid Media

Abstract

The inhibition action of the Pyrazolone Derivative (PYR) on the corrosion of mild steel in 0.5 M sulphuric acid was investigated by weight loss, polarization, impedance and SEM. Results obtained revealed that PYR performed excellently as corrosion inhibitor with efficiency of 91% at 11 ppm at 298 K. Its adsorption on mild steel obeys Langmuir and Temkin isotherm. Polarization curves indicate that PYR behaves as mixed type. The value of ∆G°a ds indicates the spontaneous physisorption of PYR. The SEM results confirm the presence of a protective surface layer over the mild steel surface. The reactivity of the compound was analysed through theoretical calculation.

Corrosion inhibition of N80 steel in 15% HCl by pyrazolone derivatives: electrochemical, surface and quantum chemical studies

“…5 The literature survey reveals that in recent years pyrazolone derivatives have been used as corrosion inhibitors, but in low acid concentration. [5][6][7][8][9][10] In recent years quantum chemical calculations is extensively used for correlating the molecular structure of inhibitors and their inhibition properties. [11][12][13] The aim of the present work is to synthesize two pyrazolone derivative namely 72-(3-amino-5-oxo-4,5-dihydro-1H-pyrazol-1yl)(p-tolyl)methyl)malononitrile (PZ-1) and 2-((3-amino-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)(phenyl)methyl)malononitrile (PZ-2), and to study their corrosion inhibition behavior for N80 steel in 15% HCl solution by using gravimetric measurements, polarization measurements, electrochemical impedance spectroscopy, scanning electron microscopy (SEM), scanning electrochemical microscopy (SECM) and quantum chemical calculations.…”

The Hibiscus extract Potential in Inhibiting Anodic Dissolution of Copper

“…1 filter paper. The active extract constituents in phytochemical screening of aqueous extract of Hibiscus [8 ,9] are: https://doi.org/10.37358/RC.22.3.8536 (Alkaloids) -Saponins -Tannins Scheme of Alkaloids [10] Scheme of Saponins [11] Schem of Tannins [12] Polarization curves were constructed for natural product -phosphoric acid mixtures at different concentrations of natural products…”