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Abstract A Study on the Development of Pre Coated Metal Adhesion by Improvement of Pretreatment Lee Soon Woo Dept. of Materials Science & Metallurgical Engineering The Graduate School Sunchon National University 1. Effect of non-degreasing and degreasing treatment on base metal surface before painti...

Abstract A Study on the Development of Pre Coated Metal Adhesion by Improvement of Pretreatment Lee Soon Woo Dept. of Materials Science & Metallurgical Engineering The Graduate School Sunchon National University 1. Effect of non-degreasing and degreasing treatment on base metal surface before painting was compared. In drawing adhesion test degreased sample was better slightly than non-degreased. But in humidity test and corrosion test for high durability degreasing sample was superior to non degreased. This is that in case of non degreased sample water attack through paint layer maker interfacial corrosion with pollutants (micro rolling oil or smudge) which is remained on the base metal, therefore crack of upper paint layer and degreasing of adhesion of paint layer are occurred, that is, humidity resistance is degreased by dirty particles on the base metal and it interrupts paint adhesion and organic junction between base metal and pretreatment. So degreasing treatment before painting is effective basically to secure high durability of PCM quality. 2. Brushing multiplies the effect of degreasing on base metal, but surface roughness(Ra) is increased. It gives difficulties to secure smooth coating adhesion when Cr coating before painting. Therefore brushing should be considered selectively according to condition of surface of base metal. 3. In surface conditioning trcatment, According to Ni adhesion by surface conditioning paint adhesion of Pb contained base metal(Pb 0.1 %) is silightly increased but due to high chemical activity from the grain corrosion by Pb. It doesn't approach to expective level. In case of Pb-less base metal (Pb< 0.003%), paint adhesion is increased outstandingly by surface conditioning of Ni adhesion because of no influence of Pb. 4. In test of paint adhesion related Cr coating weight, there was no outstanding improvement in Cr 10mg/m² and Cr 30mg/m² get better improvement and in more than 50mg/m² improvement was slightly better or kept. So, it is conceived that outstanding Cr 30 ~ 50mg/m² is suitable as optimal economical working.

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