Production and Examination of Colour-Galvanized Steel Test Sheets by Modern Analytical Methods

Abstract

Nowadays the most commonly used baths for hot-dip galvanizing are the ones which contain about 0.1 ... 0.2% of aluminium. Besides aluminium, the effects of the addition of small quantities of titanium (up to 0.0005%) to the bath have recently been studied in detail by Culcasi et al. [2]. They proved the strong impact of adding a small amount of titanium on the development of the iron-zinc layer, which influences primarily the building up of the intermetallic compound film Fe2Al5 on the surface of the steel piece in contact with the molten zinc. This aluminium-alloyed hot-dip bath with titanium usually does not form a nicely coloured surface [. Therefore, our experiments were limited to test only the effect of adding titanium to the molten zinc which contains only traces of aluminium in order to study the impact of titanium on surface colouring using GD-OES spectrometry.

Coloring hot-dip galvanization of steel samples in industrial zinc-manganese baths

“…Not only corrosion protection, but also decorative issues are important [10][11][12]. These two requirements are reached at the same time, if coloring hot dip galvanization is performed [13][14][15][16][17][18][19][20][21][22][23][24]. During this process the zinc bath is alloyed by a transitional metal, having stronger affinity towards oxygen compared to zinc (even stronger oxide-forming elements, such as Al or Mg are usually excluded from the zinc bath).…”

“…Although the above process has been quite extensively studied in laboratory conditions [13][14][15][16][17][18][19][20][21][22][23][24], there are no reports on industrial tests. Thus, the goal of this paper is to fill this knowledge gap and to report on the results of our industrial trials of colored hot dip galvanization, using Zn-Mn alloys.…”

Designing the Color of Hot-Dip Galvanized Steel Sheet Through Destructive Light Interference Using a Zn-Ti Liquid Metallic Bath

“…[10][11][12] These two fields have been combined in some patents and research papers. [13][14][15][16][17][18][19][20][21][22] Following this line, the goal of the present paper is to prepare colored coatings on hot-dip galvanized steel sheet using a Zn-Ti bath. As will be proven, color appears due to interference of light on a thin (30 to 80 nm), transparent TiO 2 layer, to be formed when the steel sample is removed from the Zn-Ti bath to air.…”