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|Specific Gravity:||1.30±0.05||Viscosity:||20~60s(Spray Coating)|
|Operating Temperature:||22±2℃||Name:||Zinc Flake Coating|
Degreasing Aluminum Zinc Flake Coating Water Solution 1.30±0.05 Gravity
2 Composition/information on ingredients
JH-9391 is made up of three packs: A,B and C;
Pack A: It is silver gray slurry that mainly chemically combined with super fine flake Zn, super fine flake Al and ethylene glycol. The radius-thickness ratio of Zn plate is 60~100.
Pack B: It is the solvent of the coating colored in orange-red and in water solution, which contain the Cr6+.
Pack C: It is the tackifier of the coating which mainly made up of cellulose white or yellowish powder.
3 Coating Process
3.1 Mix Ratio
Pack A:16.0 kg
Pack B:24.0 kg (the quantity can be increased appropriately if spray coating)
Pack C:0-50 g (according to different viscosity demand )
Before Mixture, Keep weighted A&B into the water bath at 25±2℃ , then stir A to make metal slurry disperse uniformly by frequency mixer ,after A is fully evenly dispersed, reduce the agitating speed to 60r/min, and add B.
Stir the mixture about 1~2 hours fast after B added, then add C. C should be powdered if lump exist.(The barrel temperature should not be lower than 30℃, otherwise C will not be dissolved sufficiently .)Then stir 12 hours continuously.
The coating should be filtrated by 80~100 mesh stainless steel screen before pouring into dip barrel.
Temperature control device should be equipped with dip barrel to keep the temperature of coating at 22±2℃.(If temp. is too high, the paint is liable to deteriorate, and viscosity will be effected.) The coating should be stirred circularly to keep evenly dispersed.
Test density,PH,Temperature,Viscosity and Cr6+ content of coating every 8 hours if operate continuously.
5 Technical data
|4||Viscosity||20~60s(Spray Coating) ; 60~90S(Dip-Spin Coating) . 20℃ Zahn 2# cup|
6 Mix Diagram
Caution: Temperature should be controlled in above operation.
7 Coating Process
The workpiece should be degreased if there is oil on the surface. There are three processing methods:
2.Neutral water-base degreasing agent
3.Organic solvent such as methylene chloride.
The workpiece can not be coated if there is rust or burr on the surface.The best processing method is shot blasting. The corrosion resistance of coating will be effected if acid cleaning adopted.
The workpiece afer degreasing and shot blasting should be coated through Dip-Spin coating or Spraying Coating.
The workpiece after coated should be Pre-heated as soon as possible at 80~150℃ for 8~15 mins to evaporate. ( according to heat absorption of workpiece.)
The workpiece after pre-heating should be cured at 300-340℃ for 20-40 mins. ( according to heat absorption of workpiece.)