Author(s)

N.H.B. Hamid & E.B. Hamzah

Abstract

A conversion coating is a coating produced by chemical or electrochemical treatment of a metallic surface that gives a superficial layer. This layer which is actually a compound of the metal gives corrosion protection and guarantee paint adhesion. A chromating liquid for forming the chromate film was prepared. The solution is a mixture of Cr* and Cr^ at a ratio of 1.5 to 2.0, l-20g/l ofHiSO^ 1- 20g/l of HNO], 1-20 ml NaOH and 1-10% Si oil. The solution was applied on a surface of zinc-based plated steel sheet of approximately 0.25 mm thickness and then dried. The chromate film formed on the sheet surface was approximately 0.5-1.0 |Lim in thickness. The steel sheet with chromate film was then analysed

Keywords