Dealloying is an unusual type of corrosion, occuring mainly in certain alloy metals such as copper alloys as well as in gray cast iron. When the dealloying takes place, the alloy metal loses its reactive element and retains the more stable corrosion-resistant element in a porous state.
Selective leaching, also called dealloying, demetalification, parting and selective corrosion, is a corrosion type in some solid solution alloys, when in suitable conditions a component of the alloys is preferentially leached from the material. The less noble metal is removed from the alloy by a microscopic-scale galvanic corrosion mechanism.
Corrosion fatigue; Stress corrosion cracking; Hydrogen attack; Season cracking; Sulfide stress cracking; Stepwise cracking; Liquid embrittlement; Environmental cracking is also known as caustic embrittlement, which refers to the cracking in riveted boiler plates made from steel, or as environmentally-assisted cracking (EAC).
Erosion corrosion is the combined effect that occurs due to corrosion and erosion and is caused by the rapid flow of any turbulent fluid on a metal surface. Pitting, which is often found on the inner surfaces of pipes, is the main cause of turbulence.
Flow-accelerated corrosion (FAC) is a type of corrosion where a normally protective film oxide present on surfaces like metal undergoes dissolution in fast-flowing liquid, such as water. In this mechanism, the metal undergoes corrosion in order to regain the oxide.
Oxygen Concentration Cells A water solution in contact with the metal surface will normally contain dissolved oxygen. An oxygen cell can develop at any point where the oxygen in the air is not allowed to diffuse uniformly into the solution, thereby creating a difference in oxygen concentration between two points.
Definition - What does Intergranular Corrosion mean? This is a corrosion type that attacks the boundaries of the metal crystallites, as opposed to attacking the surface of the metal. Intergranular corrosion can also be referred to as intergranular attack under a condition known as grain boundary depletion.
Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the creation of small holes in the metal. The driving power for pitting corrosion is the depassivation of a small area, which becomes anodic while an unknown but potentially vast area becomes cathodic, leading to very localised galvanic corrosion.
General corrosion is a type of corrosion that takes place at almost the same rate on the surface of the entire metal that is exposed to the corrosion-causing conditions. The surface that results from the corrosion process can have areas where there is either more or less penetration.