OPTIMIZATION OF METALLIC PIGMENTS IN COATINGS BY AN ELECTROCHEMICAL TECHNIQUE AND AN INVESTIGATION OF MANGANESE POWDER AS PIGMENT FOR METAL-RICH PRIMERS
M. Selvaraj et S. Guruviah, OPTIMIZATION OF METALLIC PIGMENTS IN COATINGS BY AN ELECTROCHEMICAL TECHNIQUE AND AN INVESTIGATION OF MANGANESE POWDER AS PIGMENT FOR METAL-RICH PRIMERS, Progress in organic coatings, 28(4), 1996, pp. 271-277
Citations number
15
Categorie Soggetti
Chemistry Applied","Materials Science, Coatings & Films
Zinc dust and manganese powder as pigments were incorporated in epoxy-
polyamide and butyl titanate medium, with different pigment volume con
centration (PVC) ranging from 20 to 74. These protective coatings were
coated on sand blasted mild steel substrates and immersed in 3 wt.% s
odium chloride solution and the corrosion current was measured by the
Tafel extrapolation method. From the corrosion current produced by the
se primers, the optimum level of the pigments in these binders was ide
ntified. Thus the protective performance of optimised primers was eval
uated on a sand blasted mild steel surface by the Tafel polarisation m
ethod in 3 wt.% sodium chloride solution, over different periods of ti
me. The results were found to be comparable with the salt spray test a
nd galvanic current measurements. The manganese powder used for this i
nvestigation showed that it could be used as an alternative to zinc po
wder for metal rich primers.