Colour resistance of Zn–Ti coatings to corrosive environments

Abstract

Adding titanium to a hot-dip galvanising bath, a coloured oxide film due to interference effect was obtained on iron samples; different colours were achieved varying the bath temperature in the range of 520-600°C. In this paper, the resistance of three colours (yellow, purple and light blue) to four corrosive environments (urban, marine, industrial and rural) has been investigated by means of an experimental approach: two specimens of each colour with titanium percentage of 0.2% were exposed for 1 year in each environment and colour measurements in CIE Lab coordinates have been recorded at fixed time intervals. Modification of colours on samples due to corrosion effects of different chemical agents was evaluated calculating CIE colour difference. Results demonstrated that the colour of the coatings have a good resistance to all kinds of atmospheres tested; so the performance of this galvanising bath resulted adequate for architectural application.

Ti/Cr(III) conversion coating on aluminium foil for lithium-ion battery package

“…Zhu et al [14] prepared a novel Ti/Zr conversion coating on the Al alloy, which was shown to be more heterogeneous compared with the single Ti or Zr conversion coating. Burattini et al [15] investigated the effect of titanium as an additive on the corrosion resistance properties of zinc (Zn) coating, and the Zn-Ti composite coating showed good corrosion resistance. Abbasi et al [16] found that the vanadium additive increased the surface roughness, surface free energy and the adhesion of the conversion coating.…”

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.…”