1 Scholarship – 2012: Painting (93306) Examples of Candidate Work.
PAINTING - IRON WORK
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PAINTING
IRON WORK
BCMS
SEMINAR
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Paint should be free from rust,grease,dust.
Wire brushes ,scrapers,etc are
equipment's used to remove all loose
scales, marks etc.
Water with caustic soda or lime is used to
remove grease .
The cleaned surface is provided with a
film of phosphoric acid.
The coats of paint then applied.
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The paint suitable to iron and steel
surfaces should be selected for each
coat.
Precaution should be taken to avoid the
presence of brush marks on the final
painted surface.
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REPAINTING OLD IRONWORK
Old surface should be thoroughly
cleaned by the application of
soap-water
If grease is present it should be
removed by washing surface with
lime and water.
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To remove old paint
the surface should
be burnt, usually by
blow lamp and then
old paint should be
scraped off or
dissolved and
removed by using
any paint solvent
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GALVANIZED IRONWORK
It is a general rule not to paint the galvanized
ironwork until it has been exposed to weather
for a period of one year or so .
If it is necessary any one of the following two
solution is applied in the surface.
1. A solution containing .40N of copper
acetate to 1l of water.
2. A solution containing 0.13N each of muriatic
acid ,copper chloride , copper nitrate to a
litre of water .
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The solution is taken in a glass vessel or
earthenware vessel.
This will prevent the precipitation of
copper salts.
When the solution is applied the surface is
turned black and after a period of about
12 hours, the coat of paint may be
applied on the surface.