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What is the difference between coated and non-coated material?

Update:03-01-2020
Summary:

What is the difference between coated and non-coated ma […]

What is the difference between coated and non-coated material?

The differences are the following:

Coated materials do not react with surrounding environment and get oxidized.
Coated materials have a higher corrosion resistance.

Coatings might be permanent(electroplating) or, temporary(paint) but they all give protection from environmental corrosion.

Coated materials have a inert coating most of the time, while uncoated ones don’t.
Coated materials exhibit a higher resistance to wear than uncoated ones.
Coated materials are in many cases harder that uncoated materials if the coating is a hard coating.

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