Corrosion MCQs : Here you will find MCQ Questions related to "Basics" in Corrosion Engineering. These Basic MCQ Questions Will help you to improve your Corrosion Engineering knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
Which of the following is true about Corrosion?
A. Corrosion is a natural process that converts a refined metal into a more chemically stable form
B. It is the gradual destruction of materials (usually a metal) by chemical and/or electrochemical reaction with their environment
C. Corrosion engineering is the field dedicated to controlling and preventing corrosion
D. All of the above
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.
Which corrosion occurs when two different metals have physical or electrical contact with each other and are immersed in a common electrolyte?
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.
Corrosion of material by furnace gases is classified as _____
A. dry corrosion
B. wet corrosion
C. galvanic corrosion
D. crevice corrosion
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.
Corrosion can not also occur in materials other than metals.
C. Can be true or false
D. Can not say
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.
If a metal undergoes uniform corrosion it becomes _____
D. thicker and perforated
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.
which of the following metal is highly corrosive?
Explanation: A kind of miracle metal, aluminum has the power to create its own corrosion-resistant coating. The process is called self-passivation
What is the mechanism of dry corrosion?
C. Differential solubility
D. Both electrochemical and differential solubility
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.
which of the following metal is less corrosive?
D. All of the above
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.
Is it possible to chemically remove the products of corrosion?
C. Can be yes or no
D. Can not say
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.
Which of the following materials will undergo Corrosion?
A. Metals only
B. Metals and Non-metals
C. Metals, Non-metals, Ceramics, Plastics and Rubbers
D. Metals, Non-metals, Ceramics and Plastics
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.