LW-19 Chromium-free 

Passivation Additive

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. 

Features:

1) Environmental protection: LW-19 is a kind of chromium-free, non-toxic and no heavy metals additive;

2) Simple: Simple process, wide control range;

3) Energy-saving: Operation at room temperature, bath make-up can apply running water;

4) Performance: Bath solution is stable and the coating film is of no color (transparent), it is also applicable for crystalphoresis pretreatment.

Waste water treatment： 

LW-19 chromium-free passivation additive is a washable chromium-free passivation product, which does not contain chromium or any other heavy metals. Thus, before discharging the waste water of degresing bath and chromium-free passivation bath, can apply quick lime and sodium hydroxide to neutralize the waste water PH to be 6.5-7.5 is ok. Specific discharge standards should be according to national laws and regulations and local government discharge standards.