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Message:: [QUOTE="Breezo, post: 764843, member: 21694"]Uniform or General Corrosion The metal loss is uniform from the surface.Often combined with high-velocity fluid erosion, with or without abrasives.Pitting Corrosion The metal loss is randomly located on the metal surface.Often combined with stagnant fluid or in areas with low fluid velocity.Galvanic Corrosion Occurs when two metals with different <a href="http://www.engineeringtoolbox.com/electrode-potential-d_482.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.engineeringtoolbox.com/electrode-potential-d_482.html" rel="nofollow">electrode potential</a> is connected in a corrosive electrolytic environment.The anodic metal develops deep pits and groves in the surface.Crevice Corrosion Occurs at places with gaskets, bolts and lap joints where crevice exists.Crevice corrosion creates pits similar to pitting corrosion.Concentration Cell Corrosion Occurs where the surface is exposed to an electrolytic environment where the concentration of the corrosive fluid or the dissolved oxygen varies.Often combined with stagnant fluid or in areas with low fluid velocity.Graphitic Corrosion Cast iron loosing iron in salt water or acids.Leaves the graphite in place, resulting in a soft weak metal. theengineeringtoolbox.com[/QUOTE]