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Corrosion and Corrosion Protection of Carbon Steel

Rajesh Kumar Singh, Kuldeep Singh, Birendra Bihari

Abstract


Carbon steel is a very important metal for petroleum industries. Petroleum refineries are used bulk amount of carbon steel for purification of crude oil. Some amount of carbon dioxide and sulphur dioxide present in crude oil. Both gases are acidic in nature so they generate hostile medium for metal. These gases convert into carbonic and sulphuric acid and develop electrochemical cell on the surface of metal and aggravate corrosion reaction. Metal undergoes corrosion reaction and it exhibits various forms of corrosion like galvanic, pitting, stress and crevice corrosion. During processing of crude oil different temperatures can be applied due to temperature variation so metal shows crack and intergranular corrosion. Hetero-cyclic organic compound 6, 11,11-trimethyldecahydro-6,8-methanobenzo [8]annulene-5,10-diylidenebisthiourea was synthesized to mitigate corrosion of carbon steel. The corrosion rate of metal was calculated by gravimetric method and potentiostat technique. Poteintiostat used to determine electrode potential, corrosion current and corrosion current density. The immersion test of uncoated and coated metal can be done at different temperatures and concentrations of carbonic acid. The coating compound adsorption phenomenon studied by Langmuir, Freundlich and Temkin isotherms. Thermal parameters like activation energy, heat of adsorption, free energy, enthalpy and entropy confirmed bonding, thin film formation randomness and nature of reaction of coating compound. This compound enhanced durability, stability, surface coverage area and coating efficiency in carbon dioxide medium. Keywords: Corrosion, carbon steel, thin film barrier, carbon dioxide, temperature, crude oil.

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References


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DOI: https://doi.org/10.37628/ijem.v9i1.1037

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