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|REVISION CARDS - OIL BLACKING AND CHEMICAL BLACKING OF STEEL|
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|TRADITIONAL OIL BLACKING OF STEEL
With steel, corrosion to the surface will always be a problem, especially if the product / component is in contact with moisture, as carried in the atmosphere. One of the most cost effective ways of preventing tarnishing / corrosion to the surface of steel, is to ‘Oil Black’. This can be achieved on a small scale in schools, although strict safety precautions must be taken.
1. Clean and degrease the steel. 2. Heat to ‘red’ heat on a brazing hearth. 3. Use tongs to drop the steel into a container of old engine oil. 4. Allow to cool and remove the steel (now with a blacked finish).
BLACKING OF STEEL WITH A
|OIL BLACKED AND CHEMICALLY BLACKED COMPONENTS
|1. Why is the ‘blacking’ of steel components sometimes needed? 3 marks|
|2. Describe the process of oil blacking OR chemical blacking of steel? 4 marks|
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