What is Corrosion & Its Types

What is Corrosion?

Are you looking for an answer: What is Corrosion?

Corrosion is the process of deterioration of a material, usually a metal, by a chemical reaction with its environment. The most general type of corrosion is rusting, which occurs when steel or iron is exposed to oxygen & moisture.

Corrosion can cause extensive damage to metals and other materials, and it can be expensive to repair. In some cases, corrosion can even cause safety hazards. For example, if a metal structure corrodes too much, it could collapse.

Read more: Corrosion Testing Methods

Corrosion is an electrochemical process that occurs when a metal is exposed to oxygen and moisture. This exposure causes the metal to oxidize, or rust.

The rate of corrosion is affected by many factors, including the type of metal, the environment it’s in, and whether it’s protected by a coating.

what is corrosion

Types of Corrosion

Now you know what is corrosion, next let us see the types of Corrosion. Corrosion can be classified into four types:

  1. Oxidation,
  2. Degradation,
  3. Radiation Damage, and
  4. Rusting.

Oxidation is a type of corrosion that occurs when a material is exposed to oxygen. This can cause the material to corrode or break down over time.

Degradation is another type of corrosion that can occur when a material is exposed to chemicals or other substances that can damage it.

Radiation Damage is a type of corrosion that can occur when a material is exposed to high levels of radiation. This can cause the material to become weak or brittle over time.

See also  Nickel vs Chrome plating

Rusting is a type of corrosion that occurs when iron or steel is exposed to moisture and oxygen. This can cause the metal to corrode and eventually break down.

Various Forms of Corrosion

Corrosion is defined as the deterioration of a material, usually a metal, due to a chemical reaction with its environment. After learning what is corrosion, let us know the different forms of Corrosion.

There are many forms of corrosion, each with its own distinctive characteristics. The most common forms of corrosion are:

  1. Uniform,
  2. Pitting,
  3. Galvanic,
  4. Crevice,
  5. Hydrogen Embrittlement
  6. Intergranular Attack
  7. Dealloying
  8. and stress cracking.

Uniform corrosion is the most common and least damaging form of corrosion. It is characterized by a general loss of material over the entire surface of the metal. This type of corrosion is often caused by exposure to an environment that is too moist or acidic.

Pitting corrosion is more localized than uniform corrosion and can cause more extensive damage to the metal. It appears as small holes or pits on the surface of the metal. This type of corrosion is often caused by exposure to chloride ions in an environment that is too moist or acidic.

See also  Welding Porosity, Types: What causes it and how to fix it

What is Corrosion in Chemistry?

In chemistry, corrosion is the process of a material, usually, a metal, becoming degraded or destroyed by a reaction with its environment.

The most common cause of corrosion is oxidation, which occurs when the metal reacts with oxygen in the air or water.

Metals can also be corroded by other chemicals in the environment, such as acid rain.

Corrosion can lead to the weakening of the metal and eventual failure. It is important to prevent or control corrosion to protect structures and devices made of metals.

What is Corrosion in Science?

Corrosion is the process of deterioration of a material, usually a metal, due to its reaction with its environment. The most common cause of corrosion is the presence of oxygen in the air. The process of corrosion can be accelerated by other factors such as salt, humidity, and acidity.

Corrosion is a natural process that happens when metals are exposed to oxygen and water. Over time, the combination of these elements causes the metal to deteriorate. This process can be accelerated by other factors such as salt, humidity, and acidity.

While some people may see corrosion as a negative thing, it can also be viewed as positive. For example, in the case of iron rusting, the process creates a new substance called ferric oxide which is more resistant to wear and tear.

See also  Heat Affected Zone or HAZ in Welding Explained

3 Main Causes of Corrosion

There are many factors that contribute to corrosion. In general, corrosion is the result of a material being exposed to an environment that it is not compatible with.

This can be due to a number of reasons, but there are three main causes of corrosion that are most commonly seen:

1) Electrochemical reactions – When two dissimilar materials are in contact with each other in the presence of an electrolyte (e.g. water), an electrochemical reaction can occur. This reaction results in the transfer of electrons from one material to the other, causing both materials to corrode.

2) Environmental factors – Certain environments are more corrosive than others. For example, salt water is highly corrosive due to the presence of chloride ions, which promote oxidation reactions.

3) Material composition – Some materials are naturally more resistant to corrosion than others. Gold has high resistance to corrosion while iron & aluminum reacts very easily with oxygen.


Reference:

Material Welding is run by highly experienced welding engineers, welding trainers & ASNT NDT Level III bloggers. We strive to provide most accurate and practical knowledge in welding, metallurgy, NDT and Engineering domains.