Question

write the conditions necessary for rusting and the measures for its prevention​

Answer 1

Rusting happens when air and water vapour come in contact. So measures for prevention is

Galvanisation

Applying a layer of paint.

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Answer 2

Conditions for Rusting of Iron

• The presence of water and oxygen is essential for the rusting of iron.

• Impurities in the iron, the presence of water vapor, acids, salts and carbon dioxide hastens rusting.

• Pure iron does not rust in dry and carbon dioxide free air. It also does not rust in pure water, free from dissolved salts.

• Metals like chromium, zinc and magnesium prevent rusting to a great extent and alkalis also help to prevent rusting.

The best ways to prevent rust include :

• Using rust resistant alloys
• Design considerations
• Galvanization
• Bluing
• Organic coating
• Powder coating
• Regular maintenance
• Using Rust Resistant Alloys

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