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DOBSON+CH16 - CORROSION Acid Rain Chemical ...

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Unformatted text preview: CORROSION Acid Rain Chemical Corrosion of Metals The phenomenon of chemical corrosion entails the direct dissolution of a material as a result of an electrochemical reaction. Chemical corrosion strongly depends on: -  Materials pairs -  Environment -  Temperature -  Surface area and microstructure The term “corrosion” most often implies a deleterious effect, however 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 attack on polymers Electrochemical Corrosion Electrochemical Corrosion • Electrochemical corrosion - Corrosion produced by the development of a current in an electrochemical cell that removes ions from the material. Corrosion of Ceramics Electrochemical Corrosion •  Ceramics are generally resistant to corrosion. •  When corrosion does occur in ceramics, it is by simple chemical dissoluAon. Corrosion of Polymers Electrochemical Corrosion •  Swelling and DissoluAon •  Bond Rupture (Chemical and RadiaAon) •  Thermal Breakdown Fuel pipe connector Lignin photo- degradaAon Ozone cracking in natural rubber Chlorine degradaAon of acetal resin ...
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