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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
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OIL BLACKED AND CHEMICALLY BLACKED COMPONENTS |
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QUESTIONS | ||
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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