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Fill in the blank with the correct option:

The process to remove rust, mill scale (oxidization) and old paints with the use of high velocity impact of abrasives (sand & grit) is known as _________ .


1. Surface washing
2. Blast cleaning
3. Manual hand cleaning
4. Flame cleaning

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Correct Answer - Option 2 : Blast cleaning

Concept:

Surface washing:

  • Surface washing refers to the removal of dirt, dust, varnish, and other debris from the surface of an object.

Blast cleaning:

  • The removal of sand or scale from metal objects by the impinging action of a current of abrasive material (such as sand, shot, or grit).

Manual hand cleaning:

  • Probably the most widely used method of prepaint cleaning is manual hand cleaning the surface.

Flame cleaning:

  • In flame cleaning at a high temperature, an oxyacetylene flame is passed over the surface to be cleaned.
  • The effect of the heat is to remove scale and rust, partly by differential expansion and partly by the evolution of steam from moisture in the rust.

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