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LW-19 Chromium-free Passivation Additive(Liquid)
    LW-19 chromium-free passivation additive is a kind of colorless transparent and environmental protection additive. It applies the composite metal salts to form the uniform chemical conversion film on aluminum surface which can effectively enhance the coating film adhesion and corrosion resistance to the surface and the coating. LW-19 is heavy metals- free and in line with the green environmental protection requirements, can completely replace the traditional chromium passivation coating for aluminum surface treatment, it can also be used to spray or immersion.
1.Environmental protection: LW-19 is a kind of chromium-free and no heavy metals, non-toxic, no health hazards acidic liquid additive; 2.Simple: Simple process, wide control range, convenient control, only need to control the bath solution PH value of 2.8-3.8; 3.Energy-saving: Operation at room temperature, bath make-up applies running water, no need to worry about the inconveniences caused by application of pure water; 4.Performance: Bath solution is stable and the coating film is of no color (transparent), it is also applicable for crystalphoresis pretreatment.
Bath Make-up:
Name Quantity Unit
LW-19 8-10 g/L
Water Balance
Operating Conditions:
Name Quantity Unit
PH 2.8-3.8
Time 60-180 seconds
Process Control:
Process flow (immersion or spraying):
Rinsing → Degreasing → Rinsing → Rinsing → Rinsing → Passivation → Rinsing → Dry
Solution Maintenance:
1、After a period of production, the passivation performance of solution will get down caused by the content decreasing, thus, LW-19 should be replenished in time;
2、The PH of solution is the key factor to affect the quality of coating film, when PH goes too high resulting in very slow coating film forming speed, please replenish LW-19 and mix evenly, then solution can be used normally again.
LW-19 is a kind of acidic and relatively safe liquid, use rubber gloves when contacting.
Waste water treatment:
LW-19 is a washable chromium free passivation product, which do not contain chromium metal or any other heavy metals, thus, the treatment method for the waste water formed by degreasing process and LW-19 chromium-free passivation process is adding caustic soda to neutralize PH to be 6.5-7.5 when waste water discharges. The discharges should be carried out according to the laws and regulations of the state and local government standards.
Packaging and Storage:
Package: Plastic barrel (25kg/barrel)
Storage: Suggested to store in cool, dry and well ventilated place; away from fire and heat source.

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