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Corrosion Protection of Rebar steel in Ocean Atmosphere

Rajesh Kumar Singh, Shabana Latif, Manjay Kumar Thakur

Abstract


Rebar is an important engineering metal. It is used in construction of housing, bridge and other infrastructures works. It is surround with concrete for strengthen building block components. The concentration of chloride ions in ocean atmosphere is higher so it produces hostile environment for rebar steel. The lots of porosities are available on the outer surface area of concrete so chloride ions enter inside by osmosis or diffusion process. It develops corrosion cell on the surface of rebar steel and accelerate corrosion reactions on their interface. Metal produces galvanic, pitting, crevice and stress corrosion in chloride ions environment thus deterioration starts on their outer surface. The corrosion reaction not only decreases mechanical strength of rebar steel but also produces disbonding between metal and concrete. The organic compound 4a,8b-dihydronaphthalene-1,4,5,8- tetraoxime was synthesized in laboratory and it used to control the corrosion of rebar steel in chloride ions medium. The corrosion rate of rebar steel was determined by weight loss and potentiostat techniques in absence and presence of coating 4a,8b-dihydronaphthalene-1,4,5,8-tetraoxime at different temperatures and concentrations. The surface adsorption phenomena were studied by Langmuir, Freundlich and Temkin isotherm. The nature of bond formation was confirmed by activation energy, heat of adsorption, free energy, enthalpy and entropy. The surface coverage areas and coating efficiencies were calculated by without and with coating of corrosion rate equation. The coating compound formed strong chemical between base metal and concrete


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