What are the most common forms of metal corrosion

 Degradation of a material caused by chemical interactions between the material and its surroundings is called corrosion. Although corrosion can affect materials other than metals (such as polymers and ceramics), the term is most commonly used to refer to the deterioration of metals.

What are the most common types of metal corrosion?

Corrosion can be divided into different types depending on how it behaves. Corrosion types are classified according to the appearance of the metal after corrosion, and visual observation is the main identification method. While the naked eye is usually sufficient, there are situations in which going down is advantageous or necessary.

Stress corrosion cracking

Stress corrosion occurs when a material is exposed to both tensile loads and a corrosive environment. Each metal has a specific range or tensile limit near which stress corrosion is more likely to occur.

pitting

During the investigation, quality personnel also found several tiny voids in the substance. Although stress corrosion cracking is also present, it shows clear symptoms of pitting, which is a more destructive type of corrosion. Many different factors can cause these tiny, deep voids.

Erosion corrosion

One of the most common conditions on the list is erosion corrosion, which occurs when a corrosive liquid flows over a metal, thus accelerating the surface degradation of the metal. This usually leaves grooves, pits or grooves in the metal surface, and this wear is obvious to the naked eye.

Crevice corrosion

As the name suggests, this type of corrosion occurs within cracks or crevices in the metal's surface. Gap corrosion also affects all objects that the metal is "attached" to, such as metal that is welded to another metal object or even bonded to a non-metal object.

Selective leaching

When only one (or more) elements in the alloy begin to corrode, this is called selective leaching corrosion. As this degradation progresses, the alloys begin to physically separate from each other. Due to its use history and current condition, your funnel is now showing symptoms of selective leaching.

Uniform corrosion

Rust is a classic example of uniform corrosion that most people, especially those who bought Mazda6 between 2005 and 2008, will recognize. Most of the specified material (or the entire surface area) is subject to this uniform corrosion. You can tell with the naked eye.

Intergranular corrosion

Intergranular corrosion occurs at the grain boundary but does not affect the grain. This occurs when there is a clear difference in the reactivity of grain boundaries and grains to contaminants. Due to improper welding and heat treatment, the reactivity of stainless steel and copper is different.

Galvanic/bimetallic corrosion

Bimetallic corrosion occurs when two incompatible metals come into contact for a long time. The electrode potential difference between the metals forms a bimetallic coupled battery. In a bimetallic battery, one metal acts as the cathode and the other acts as the anode.

Atmospheric corrosion

One type of moisture corrosion caused by electrolytes is atmospheric corrosion. In this case, moisture in the air, rain, etc. act as electrolytes and begin to corrode on the exposed metal surface.

Fretting corrosion

When two materials are connected, fretting corrosion occurs at the contact point. This occurs due to sliding and vibration in the contact area. Bolts and riveted connections, clamping surfaces, etc., all exhibit this corrosion.