CLICK IMAGE TO ENLARGE (+)
Figure 1 - GDOES profile of a Cr(III) conversion layer on zinc with silica (University of Besançon, France).
Figure 2 - Evolution of the micro-cracked structure of black chromate on zinc-iron with immersion time: 15, 30, 60 and 90 sec.
Figure 5 - Coefficient of friction over ZnNi clear passivate + top coat according to DIN 946 on M10 screws.
Figure 6 - Coefficient of friction on M8 screws coated with Zn/Ni + Cr(III) clear passivate and a low friction top coat.** (** Finigard 107, Coventya, Inc., Oriskany, NY; Brooklyn Heights, OH.according to Renault standard 01-50-005.)
Figure 7 - Appearance of an ASU3 aluminum thrust plate after friction testing using the incorrect Zn/Ni plated screw (µg = 0.37).
Figure 8 - Roughness profiles of (a) matte Zn/Ni + clear Cr(III) passivate + top coat (μg = 0.274) and (b) Zn/Ni + clear Cr(III) passivate + Top coat (μg = 0.135).
- By altering the metallic structure of zinc/nickel by decreasing nodule formation, as shown in Fig. 8.
- By providing a passivate layer capable of retaining the lubricant.
- By acting on the top coat recipe as well. The hydrophobic lubricant must be better linked with the passivate layer and the surface energy of the passivate must be compatible with the top coat.
blog comments powered by Disqus