Finishing techniques
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Flip to reveal answersWhat are the three jobs of a finish?
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Question
What are the three jobs of a finish?
Answer
Protect the material from its environment, improve how the product looks and feels, and by doing both extend the product's working life.
Question
Why does anodising not peel?
Answer
It is not a coating. The oxide layer is grown out of the aluminium itself, so there is nothing on top of the metal to lift — though it is thin and brittle.
Question
What is sacrificial protection?
Answer
Zinc in a galvanised coating corrodes in preference to the steel, so it goes on protecting even where a scratch has exposed the steel beneath.
Question
Why is longevity an environmental argument?
Answer
A finish that doubles a product's life halves the impact of everything that went into making it — usually a larger saving than any change of material.
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Full study notes for Finishing techniques
Topic 4.1 hub
Manufacturing techniques
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