Corrosion MCQ Questions And Answers

Explanation: Corrosion is a natural process that converts a refined metal into a more chemically stable form such as oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually a metal) by chemical and/or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and preventing corrosion.

Explanation: Galvanic corrosion occurs when two different metals have physical or electrical contact with each other and are immersed in a common electrolyte, or when the same metal is exposed to electrolyte with different concentrations.

Explanation: Dry corrosion occurs in the absence of moisture usually by vapors and gases whereas the wet corrosion, galvanic corrosion and crevice corrosion occurs in aqueous state or in the presence of moisture.

Explanation: Corrosion can also occur in materials other than metals, such as ceramics or polymers, although in this context, the term "degradation" is more common.

Explanation: Uniform corrosion is the most common form of corrosion. It is characterized by an electrochemical reaction that proceeds uniformly over the entire exposed surface. Thus, the metal becomes thinner.

Explanation: A kind of miracle metal, aluminum has the power to create its own corrosion-resistant coating. The process is called self-passivation

Explanation: Dry corrosion occurs in the absence of a liquid phase. Vapors and gases are usually the corrodents. These will hit and adsorbed on the metal surface to form corrosion. So dry corrosion can be explained by an absorption mechanism.

Explanation: Red metals like copper, bronze and brass often contain little to no iron, which like aluminum, means that they are not subject to rust. When these metals oxidize, they won't corrode, but they may turn green from prolonged exposure to oxygen.

Explanation: Often it is possible to chemically remove the products of corrosion. For example, phosphoric acid in the form of naval jelly is often applied to ferrous tools or surfaces to remove rust.

Explanation: Corrosion is defined as the destruction or deterioration of a material because of reaction with its environment. Every material in the universe will undergo corrosion but it varies in time and form. Any Physical, Chemical or Mechanical deviation of the original material is known as Corrosion.