Corrosion Protection Polybutadiene-Coated Mild Steel in Marine Water by Nanocoating and Filler Compounds-Crimson Publishers
Corrosion Protection Polybutadiene-Coated Mild Steel inMarine Water by Nanocoating and Filler Compounds by Rajesh Kumar Singh in Research & Development in Material Science
Mild steel is economical metal so
it is used in different appliances of industries, railways, bridges,
construction works and marine water. Marine water produces corrosive
environment for this metal. Marine water is saline in character so it corrodes
mild steel. Polybutadiene is coated on the surface of mild steel for corrosion
protection. But this coating does not provide sufficient protection of base
metal. Marine water is major absorber of CO2. It converts CO2 into H2CO3.
Saline water and H2CO3 interacts with polybutadiene-coated mild steel and they
exhibit chemical and electrochemical reactions. This chemical reaction produces
swelling and dissolving corrosion and produce disbonding between carbon and
carbon of polybutadiene. These corrosive agents show osmosis or diffusion
process and inter inside the base metal and develop corrosion cell. Metal
generates corrosion reaction which produces several forms of corrosion like
galvanic, pitting, crevice, stress, intergranular, blistering and
embrittlement. For the protection from such types of corrosions synthesized
organic compounds octahydrodibenzo[a,d][8]annulene-5,12-dioxime was used and
this compounds was nanocoated on the surface of polybutadiene-coated mild
steel. During nanocoating used compound developed lot of porosities on the
surface of polybutadiene-coated mild steel and they were blocked by the use of
filler materials ZnS. The corrosion rate of material was calculated by
gravimetric and potentiostat. Composite barrier formation was analyzed by activation
energy, heat of adsorption, free energy, enthalpy and entropy. The results of
surface coverage area and coating efficiency were indicated that compound
octahydrodibenzo[a,d][8]annulene-5,12-dioxime and ZnS have good coating and
filling properties.
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