Synthesis and characterization of anti-corrosion substances applied to metallic substrates
Loading...
Date
2025
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University 20 August 1955 Skikda
Abstract
This study investigates the corrosion inhibition properties of two novel compounds: 2-
(2, 4, 5-trimethoxy benzylidene) hydrazine carbothioamide (TMBHCA) and α-
aminophosphonate (FHN) for XC38 and ASTM A283 Grade C carbon steel respectively in 1M
HCl solution. Using a comprehensive experimental approach, including gravimetric analysis,
potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS), the corrosion
behaviour of the steel at different inhibitor concentrations and immersion time was
systematically examined. Scanning electron microscopy (SEM) and quantum chemical
calculations were also used to better understand the inhibition mechanisms. The results reveal
that TMBHCA offers significant corrosion protection, achieving maximum inhibition
efficiency (IE) of 97.8% at 200 ppm. It acts as a mixed-type inhibitor, with potentiodynamic
polarization and Nyquist diagrams indicating an increase in charge transfer resistance and a
reduction in double-layer capacitance as inhibitor concentration increases. SEM images
corroborate these results. Over a 28-day immersion period, the inhibition efficiency of
TMBHCA increased from 75.2% after one day to 95.87% after 21 days, suggesting a
progressive adsorption of TMBHCA molecules onto the steel surface over time. FHN, on the
other hand, showed good inhibition efficiency, reaching 95.47% at 200 ppm. Adsorption of
TMBHCA and FHN to the metal surface follows Langmuir's adsorption isotherm model. The
theoretical study carried out for both compounds confirmed the efficiency and good adsorption
of the inhibitors
Description
Keywords
anti-corrosion, metallic substrates