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Chapter 19: Problem 19

Describe the preventive methods of corrosion.

Short Answer

Expert verified
Preventive methods of corrosion include the barrier method (using paints, oil, plating), environment control (humidity control or reducing substances causing corrosion), cathodic protection (by converting all anodic to cathodic sites) and selecting resistant materials and better design.

Step by step solution

01

Definition of Corrosion

Corrosion is the natural process that converts a refined metal into a more chemically stable form such as oxides, hydroxides, or sulfides. It is the gradual destruction of materials, usually metals, by a chemical reaction with their environment.
02

Barrier Prevention Method

This method seeks to keep a corrosive substance from coming into contact with the metal. This can include painting, applying oil/grease, using plating (like nickel or chrome), or even plastic coating. These barriers protect the metal because they are not porous and block out water and oxygen, which can contribute to corrosion.
03

Environmental Modification

Sometimes, it is possible to control the environment around a metal, thus stopping corrosion. This includes controlling the humidity, reducing the sulfur, chloride, or oxygen in the environment, or using dehumidifiers or air conditioning
04

Cathodic Protection

Cathodic protection is a method used to prevent corrosion by converting all the anodic (active) sites on the metal surface to cathodic (passive) sites by supplying electrical energy from a secondary source. This can be done through two methods – sacrificial anode and impressed current.
05

Material Selection and Design

Choosing materials that are resistant to corrosion, such as stainless steel or galvanized steel, can prevent corrosion. Also, designing structures to prevent water collecting and sitting on the metal can also help.

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Most popular questions from this chapter

Write a short note on the oxidising action of \(\mathrm{KMnO}_{4}\).

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