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Types of Corrosion

Atmospheric Corrosion
Atmospheric Corrosion

Atmospheric corrosion is the deterioration and destruction of a material and its vital properties due to electrochemical as well as the other reactions of its surface with the constituents of the atmosphere surrounding the material.

Crevice Corrosion; Cavitation
Crevice Corrosion; Cavitation

Crevice corrosion is a very similar mechanism to pitting corrosion; alloys resistant to one are generally resistant to both. Crevice corrosion can be viewed as a less severe form of localized corrosion when compared with pitting.

De-Alloying:
De-Alloying:

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.

Dezincification, Dealloying (Selective Leaching)
Dezincification, Dealloying (Selective Leaching)

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.

Environmental Cracking:
Environmental Cracking:

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
Erosion Corrosion

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-Assisted Corrosion (FAC):
Flow-Assisted Corrosion (FAC):

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.

Fretting
Fretting

Fretting corrosion is a combined action of fretting as well as corrosion, which involves corrosion at points where two metal surfaces make contact by means of a rubbing action. Fretting corrosion is also known as chafing corrosion.

Fretting Corrosion:
Fretting Corrosion:

Fretting corrosion is a combined action of fretting as well as corrosion, which involves corrosion at points where two metal surfaces make contact by means of a rubbing action. Fretting corrosion is also known as chafing corrosion.

Galvanic Corrosion (Concentration Cells, Water Line Attack)
Galvanic Corrosion (Concentration Cells, Water Line Attack)

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.

Galvanic Corrosion:
Galvanic Corrosion:

Galvanic corrosion refers to corrosion damage that occurs when two different metals are in electrical contact in an electrolyte, where the more noble metal is protected and the more active metal tends to corrode.

General Attack Corrosion:
General Attack Corrosion:

General Attack Corrosion Also referred to as "general corrosion" or " uniform corrosion," general attack corrosion proceeds more or less uniformly over an exposed surface without appreciable localization.

source: nace.org
Intergranular Corrosion
Intergranular Corrosion

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.

image: g2mtlabs.com
Localized Corrosion:
Localized Corrosion:

Localized corrosion refers to the hastened attack of passive metals in corrosive environments. It is characterized by an intense attack at confined areas on surface components, while the remaining area of the surface corrodes at a much slower rate.

Pitting
Pitting

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.

Turn to non
Turn to non

Corrosion is an oxidation reaction with atmospheric oxygen in the presence of water on the surface of a metal. Iron corrodes more quickly than most other transition metals to form an iron oxide. Corrosion or rusting of iron is accelerated in the presence of CO

image: ebay.com
Uniform Corrosion (General Corrosion)
Uniform Corrosion (General 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.

Use Drying Agents and Moisture Barrier Products
Use Drying Agents and Moisture Barrier Products

How to Stop Metal Corrosion ... Use drying agents and moisture barrier products. Make sure underground piping is laid in a layer of backfill, such as limestone.

source: hj3.com
image: hycrete.com

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