Which of the following is not a type of corrosion?
A. Direct corrosion B. Anodic corrosion
C. Galvanic corrosion D. Cathodic corrosion
Answers
Explanation:
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D. Cathodic corrosion
Corrosion:
Corrosion is a natural process that converts a refined metal into a more chemically stable oxide. It is the gradual destruction of materials (usually metal) by chemical or electrochemical reactions with their environment.
Corrosion is of several types, few of the mare:
Direct corrosion: This type of corrosion is caused by direct current. This may originate from sources of current like DC welding.
Anodic corrosion: In anodic corrosion, the metal forming the anode dissolves in the electrolyte in the form of positively charged ions.
Galvanic corrosion: Galvanic corrosion is an electrochemical process in which one metal corrodes preferentially when it is in electrical contact with another, in the presence of an electrolyte.
A cathode is an electrode that receives electrons - positive ions are discharged, and negative ions are formed. The cathode is protected from corrosion. Hence, cathodic corrosion is not a type of corrosion.