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Chapter 19: Problem 14

Write short note on electrochemical theory of corrosion.

Short Answer

Expert verified
The Electrochemical Theory of Corrosion explains corrosion as an electrochemical process involving oxidation (loss of electrons) and reduction (gain of electrons) reactions. Such reactions occur due to a cell action, either at two different spots of the same metallic surface or between two different metal pieces in contact with each other. Understanding this theory is crucial in developing effective corrosion prevention strategies.

Step by step solution

01

Understanding Electrochemistry

Beginning with the fundamental idea of what electrochemistry is, electrochemistry explores the exchange between chemical energy and electrical energy. In essence, it is the study of chemical reactions which involve the movement of electrons from one atom to another (redox reactivity).
02

Explaining Corrosion Process

Corrosion is a naturally occurring process, which converts a refined metal into a more stable form such as an oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually metals) by chemical reaction with their environment.
03

Interrelating Electrochemistry and Corrosion

Corrosion can be seen as an electrochemical process, involving a flow of electrons from one area to another. In a basic corrosion process, metal atoms get oxidized, losing electrons to form cations, and these electrons are then reduced by hydrogen ions or oxygen.
04

Delving into Electrochemical Theory of Corrosion

The Electrochemical Theory of Corrosion posits that corrosion is due to a cell action either at two different spots of the same metallic surface or between two different metal pieces in contact with each other. Anodic reactions involve metal dissolution (oxidation), while cathodic reactions involve reduction, for instance oxygen reduction or hydrogen evolution.
05

Concluding the Note

In conclusion, the electrochemical nature of corrosion allows for control of the process, either by altering the anode (the place where oxidation occurs) or the cathode (where reduction occurs). This theory has considerable significance in developing strategies for corrosion prevention.

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