Transcription of Stainless Steel and Corrosion - Aperam
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Stainless Steel and Corrosion - Aperam
Stainless Europe Stainless Steel and Corrosion What is Corrosion ? Metals, with the exception of the precious metals such What are the major factors of Corrosion ? as gold and platinum, that are found in their natural state are always extracted from ores; metals have therefore a Medium Design tendency to revert to their stable state, which corresponds Chemical nature to their original state, that is to say their oxide form. Concentration Surface state Metal Corrosion is essentially an electro-chemical reaction at Oxidising power Shape pH (acidity) Assembly (welds, rivets). the interface between metal and surrounding environment . Temperature Mechanical stresses Pressure Proximity to other metals Viscosity Contact with a medium Solid deposits (partial or total immersion). Stainless Steel and the passive layer Agitation Methods of protection Steel is an alloy of iron and carbon.
As figures 2 and 3 show, this pitting potential can only be used to rank the grades in a given medium. It diminishes notedly when the temperature (figure 2) or the concentration of chlorides in the medium increases.
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