DOBSON+CH16_2013 - CORROSION Acid Rain Chemical Corrosion...

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CORROSION Acid Rain
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Chemical’Corrosion’of’ Metals The phenomenon of chemical corrosion entails the direct dissolution of a material as a result of a chemical or electrochemical reaction. Chemical corrosion strongly depends on: - Materials pairs - Environment - Temperature - Surface area and microstructure
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Chemical’Corrosion’of’ Metals The term “corrosion” most often implies a deleterious effect. However it is desirable in some instances, i.e. chemical mechanical planarization (CMP). Corrosion appears in many forms: - Liquid-metal attack - Selective leaching - Dissolution and oxidation of ceramics - Chemical and physical attack on polymers
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Electrochemical Corrosion Electrochemical corrosion -’ Corrosion’produced’by’the’development’ of’a’current’in’an’electrochemical’cell’that’removes’ions’from’the’ material. Electrochemical’Corrosion Rust’ Corrosion’may’occur’as’a’result’of’concentra9on’diFerences.’
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DOBSON+CH16_2013 - CORROSION Acid Rain Chemical Corrosion...

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