Passivation - Chrome Including


Contrary to what is beleived, passivation is not for corrosion protection with itself. Passivation is effective when made prior to paintings. It improves adhesion of paint particles and prepares the surface for following applications to have enhenced corrosion protection. Chromium passivation treatment is used under conditons of % 0,2 - 0,3 chemical concentration and at ambient temperatures. The treatment solution includes hexavalent chromium ions, hence it must be converted to trivalent chromium while discharging.


Passivation treatment eliminates unwanted ionic elements which is coming with water rinsing or after zinc / iron phosphate coating. These type of water hardening ions have poteintial of producing salts under paint film which can cause blistering or tear of paintings. For all these reasons, use of passivation chemicals improves corrosion protection of painted, especially, powder coated metal parts.


PHORYL PAS 15 - Chromium Passivation

It is an effective passivation chemical available for both spray and immesion applications after zinc phosphate or iron phosphate coatings. Treating time varies in the range of 45 - 60 seconds at ambient temperature. Use concentration is around % 0,3. Hexavalent chromium must be converted to trivalent form while discharging. 


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