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Nanocoating and Electrospray Techniques Use to Mitigation Corrosion Sculptures
Abstract
The most sculptures of the world are created by the brass, bronze, iron, silver, gold and metalloid. They come in contact of corrosive pollutants to produce chemical, electrochemical and biochemical reactions and develop various form of corrosion like uniform corrosion, galvanic corrosion, pitting corrosion, stress corrosion and crevice corrosion. The corrosive gases CO2, NO2 and SO2 concentrations increase in atmosphere rapidly after industrialization. The major contributors of these gases are burning of coal, thermal power and fusil foul. Pollutants corrode sculptures and tarnish interfacial looks. Corrosive gases change physical, chemical and mechanical properties of mterials. Pollutants occur in form of gases, liquids and particulates. The gaseous pollutants are carbon dioxide, nitrogen dioxide and sulphur dioxide, liquid pollutant acid rain and dust particles develop hostile environment for metallic sculptures. The corrosion of sculptures is a global problem. It is not fully control but their affects checked by the use of nanocoating and electrospray methods. Organic compound tetrahydro-dibenzo[7]annulene-5,11-disemicarbazone was synthesized in laboratory and it used as nanocoating. SiC coated on the surface of organic compound coated metal for the formation composite layer. The results of energy of activation, heat of adsorption, free energy, enthalpy and entropy indicated formation of chemical bonding with base metal. The gravimetric and potentiostatic polarization tools were applied for the calculation of corrosion rate of metal in presence of nitrogen dioxide. These compounds adsorption phenomenon were studied by the applications of Langmuir, Freundlich and Temkin equation. Corrosion rates of untreated and coated materials were used to calculate surface covering areas and coating efficiency. Complexation occurred on metal to verify by the values of thermal parameters, various isotherms and surface accommodation activities
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