Corrosion Protection of Aluminium in Sulphur dioxide Environment by the use of Nanocoating and Electrospray Techniques

 

Abstract

Aluminium is a very useful metal. It is easily converted into suitable forms so it fits for in various appliances like households, industries, aerospace, electronic, transport and other processes. It is produced corroding affect in sulphur dioxide environment. Al interacts with sulphur dioxide in presence of humidity to produce corrosive medium for its. It creates acidic environment for Al metal and forms corrosion cell on its surface. The electrode potential difference occur between Al|Al3+ anode and cathode H+|H2 thus corrosion reaction takes place on the surface of base metal and produces different forms corrosion like galvanic, pitting, stress, crevice, intergrannular etc. The organic compound terahydro-dibenzo[a,d][7]annulene-5,11-dioxime and zinc oxide electrospray were used for corrosion protection of Al in sulphur dioxide environment. The terahydro-dibenzo[a,d] [7]annulene-5,11-dioxime and ZnO electrospray formed composite barrier on aluminium metal that barrier produced a passive layer for sulphur dioxide. The corrosion rate of uncoated and coated aluminium studied in different temperatures, concentrations, humidity and duration of days. The corrosion rate of metal was determined by gravimetric and potentiostat techniques. The surface adsorption phenomenon of coating compound terahydro-dibenzo[a,d][7]annulene-5,11-dioxime and zinc oxide electrospray was studied by Langmuir, Freundlich and Temkin isotherm and Arrhenius equation. The composite barrier formation on the surface of aluminium by terahydro-dibenzo[a,d][7] annulene-5,11-dioxime and electrospray zinc oxide was studied by activation energy, heat of adsorption, free energy, enthalpy and entropy. The surface coverage area and percentage coating efficiency of coating and electrospray compounds results found to be high in sulphur dioxide medium. Both compounds developed composited in sulphur dioxide to be stable and also enhanced durability of aluminium metal.

 

 

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