TYPES OF CORROSION (original) (raw)
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Different Forms of Corrosion Classified on the Basis of Appearance 1) electrochemical corrosion is the only deterioration mechanism; 2) anodic and cathodic reactions take place all over the electrode surface, but not simultaneously at the same place, i.e. the anodic and cathodic reactions exchange places, constantly or frequently. Closely related to this dynamic behaviour it is assumed that: 3) there are no significant macroscopic concentration differences in the electrolyte along the metal surface, and the metal is fairly homogeneous. These three assumptions lead to uniform (general) corrosion. But this is only one of several corrosion forms that occur under different conditions. The other forms of corrosion depend on the deviations from the mentioned assumptions. Such deviations may be due to
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Different Forms of Corrosion Classified on the Basis of Appearence
1. Uniform (general) corrosion 2. Galvanic (two–metal) corrosion 3. Thermogalvanic corrosion 4. Crevice corrosion (including deposit corrosion) 5. Pitting, pitting corrosion 6. Selective attack, selective leaching (de–alloying) 7. Intergranular corrosion (including exfoliation) 8. Erosion corrosion 9. Cavitation corrosion 10. Fretting corrosion 11. Stress corrosion cracking 12. Corrosion fatigue
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CORROSION & CORROSION PREVENTION
Corrosion may be defined as the destruction or deterioration in properties of materials by interaction with their environments. It is a natural phenomenon. Engineers generally consider corrosion when dealing with metallic materials. However, the process affects all sorts of materials, for example, ceramics, plastics, rubber etc. Rusting of iron and steel is the most common example of corrosion. Swelling in plastics, hardening of rubber, deterioration of paint, and fluxing of the ceramic lining of a furnace are all incidences of corrosion in non metallic materials. Metallurgists may think of corrosion as reverse extractive metallurgy. Metals are extracted from their compounds occurring in nature through extractive metallurgy processes involving considerable expenditure of energy, natural resources, time, and man power. Corrosion works to convert the metal I back into the same compounds.
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References and Definitions Why Metals Corrode Nature of Corrosion Reaction Nature of Metals Effect of Electrolyte Composition Physical Variables Forms of Corrosion
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