What is metal corrosion?
The degradation of a material caused by chemical interactions between it and its surroundings is known as corrosion. Although corrosion can impact materials outside metals, such as polymers and ceramics, the term is most frequently used to refer to the deterioration of metals.
What are the most common types of metal corrosion?
According to how it manifests, corrosion is categorized. Corrosion types are categorized according to how the metal looks after it has been corroded, with visual observation being the primary identification method. While the naked eye is usually sufficient, there are situations when magnification is advantageous or necessary.
- Stress Corrosion Cracking
Stress corrosion happens when a material is exposed to both tensile loads and a corrosive environment. Each metal has a particular range or tensile limit, and stress corrosion is more likely to happen closer to this limit’s height.
- Pitting Corrosion
During the investigation, a quality member also finds several tiny cavities in the substance. Although stress corrosion cracking is also present, this exhibits telltale symptoms of pitting, a considerably more destructive type of corrosion. Many diverse things can lead to these tiny, deep cavities.
- Erosion Corrosion
One of the more frequent occurrences on the list, erosion corrosion, happens when a corrosive liquid passes over a metal, hastening the surface degradation of that metal. Typically leaving behind troughs, craters, or grooves on the surface of the metal, this sort of wear is evident to the unaided eye.
- Crevice Corrosion
As the name suggests, this type of corrosion develops inside cracks or fissures on the metal’s surface. Crevice corrosion can also impact everything that the metal is “connected” to, such as metal welded to another metal object or even metal bonded to non-metal objects.
- Selective Leaching
When only one (or more) of the elements in an alloy starts to corrode, this is known as selective leaching corrosion. The alloys start to physically separate from one another as this degradation progresses. Your funnel is now displaying symptoms of selective leaching due to its usage history and current circumstances.
- Uniform Corrosion
Rusting is a typical instance of uniform corrosion that most people, especially those who purchased a Mazda6 between 2005 and 2008, can recognize. An extensive portion (or the entire surface area) of the specified material is subject to this uniform corrosion. It is discernible with the unaided eye.
- Intergranular Corrosion
Intergranular corrosion is corrosion that happens at grain borders without affecting the grains. When there is a clear distinction between grain borders and grains in their reactivity to contaminants, it results. Because of improper welding and heat treatment of stainless steel, copper, etc., there is a difference in reactivity.
- Galvanic/Bimetallic Corrosion
Bimetallic corrosion happens when two metals that are not compatible remain in contact for a long time. The difference in electrode potentials between the metals creates the bimetallic couple cell. In a bimetallic couple cell, one metal functions as the cathode and the other as the anode.
- Atmospheric Corrosion
One kind of moist corrosion brought on by electrolytes is atmospheric corrosion. In this situation, moisture in the air, rain, etc., serves as electrolytes to start corrosion on the exposed metal surface.
- Fretting Corrosion
When two materials are linked, fretting corrosion develops at the point of contact. This occurs as a result of slippage and vibrations in the contact area. Bolted and riveted connections, clamped surfaces, etc., all exhibit this kind of corrosion.
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