A PPT on PAINTING DONE ON IRON WORKS Seminar for Building construction and materials science!

1. PAINTING
IRON WORK
BCMS
SEMINAR

2.  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.

3.  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.

4. 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.

5.  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

6. 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 .

7.  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.