Rishav Ghosh | Jadavpur University (original) (raw)
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Papers by Rishav Ghosh
Journal of Materials Engineering and Performance
The selection of precursors for silane-based anti-corrosive coatings to protect steel is challeng... more The selection of precursors for silane-based anti-corrosive coatings to protect steel is challenging to obtain in a few experiments as the protection performance varies with types of precursor molecule and surface of metal substrates. The coating performance of precursors was predicted through quantum chemical calculations (Density Functional Theory (DFT) where DFT parameters such as hardness (ƞ), dipole moment (µ), and the number of electrons transferred (∆N) to metal substrate enabling us to choose suitable silane coupling agents. DFT study and experimental validation reveals that precursor containing functional groups like -NH2, -SH, and -O- offers better protection against corrosion to galvanized IF steel compared to those without functional moiety. The order of corrosion inhibition is MPTMS (1M) ≈ APTES (1A) > GPTMS (1G) > TEOS(1T).
The present work investigates the effect of microstructure, pH as well as the role of aggressive ... more The present work investigates the effect of microstructure, pH as well as the role of aggressive chloride ions on the corrosion behavior of American Petroleum Institute (API) X70 and X80 steel grades. The corrosion behavior was studied using single-run dynamic and cyclic polarization in different solutions followed by microstructural analysis of the corroded samples to determine the mode and extent of corrosion damage. The solutions consist of a near-neutral aqueous sodium chloride solution, mildly alkaline carbonate-bicarbonate solution (pH-8.8), and highly alkaline carbonate-bicarbonate solution (pH-12) with and without the presence of chlorides. Ferrite phase in both the steel was found to dissolve preferentially in the different solutions leading to pitting as a result of microgalvanic coupling with the cementite and/or bainite phase. Interestingly, the corrosion resistance of the X70 grade was found to be greater than X80 at near-neutral as well as low alkaline carbonate-bicarb...
Surface and Coatings Technology
Electrochimica Acta, 2021
Journal of Materials Engineering and Performance
The selection of precursors for silane-based anti-corrosive coatings to protect steel is challeng... more The selection of precursors for silane-based anti-corrosive coatings to protect steel is challenging to obtain in a few experiments as the protection performance varies with types of precursor molecule and surface of metal substrates. The coating performance of precursors was predicted through quantum chemical calculations (Density Functional Theory (DFT) where DFT parameters such as hardness (ƞ), dipole moment (µ), and the number of electrons transferred (∆N) to metal substrate enabling us to choose suitable silane coupling agents. DFT study and experimental validation reveals that precursor containing functional groups like -NH2, -SH, and -O- offers better protection against corrosion to galvanized IF steel compared to those without functional moiety. The order of corrosion inhibition is MPTMS (1M) ≈ APTES (1A) > GPTMS (1G) > TEOS(1T).
The present work investigates the effect of microstructure, pH as well as the role of aggressive ... more The present work investigates the effect of microstructure, pH as well as the role of aggressive chloride ions on the corrosion behavior of American Petroleum Institute (API) X70 and X80 steel grades. The corrosion behavior was studied using single-run dynamic and cyclic polarization in different solutions followed by microstructural analysis of the corroded samples to determine the mode and extent of corrosion damage. The solutions consist of a near-neutral aqueous sodium chloride solution, mildly alkaline carbonate-bicarbonate solution (pH-8.8), and highly alkaline carbonate-bicarbonate solution (pH-12) with and without the presence of chlorides. Ferrite phase in both the steel was found to dissolve preferentially in the different solutions leading to pitting as a result of microgalvanic coupling with the cementite and/or bainite phase. Interestingly, the corrosion resistance of the X70 grade was found to be greater than X80 at near-neutral as well as low alkaline carbonate-bicarb...
Surface and Coatings Technology
Electrochimica Acta, 2021