Chrome-free Passivation


Pasivation is used to eliminate ionic elements coming from water. It is available to apply the treatment by spraying or immersion. Chrome-free or chromium passivation is preferred according to requests of enterprises.


Phosphate crystal structure is not quite uniform after iron phosphate zinc phosphate coatings. Along with shaping the phosphated surface more homogenous and uniform, passivation treatment also provides extra corrosion protection by eliminating ions such as calcium and magnesium that can form corrosive salts under paintings.


Acidic passivation chemicals are acidic, hence bath material must be made of acid durable materials. pH of passivation bath must be between 4 - 6. Passivation baths prepared with very low concentration of chemicals (%0,1 - 0,3), so it make sense to rebuild a new treatment bath instead of making additions. Treating time of phosphated metal part in the passivation solution is in the range of 45 - 60 seconds. Excessive time duration in the passivating bath can cause lightly peel off of phosphate coatings


PHORYL PAS 17 - Chrome-free Passivation

It is a zirconium based chrome free passivation product used after iron phosphate or zinc phosphate coatings. Immersion and spray applications are available. Passivation treatment can be run at ambient temperature with a time duration of  45 - 60 seconds. Product concentration is around %0,3. pH of the solution must be kept in the range of 4 - 6.


PHORYL PAS 18 - Neutralisation

PHORYL PAS 18 is a immersion application mid alkaline neutralization product used after zinc phosphate coating in wire and tube drawing operations. Zinc phosphated metal wire or tube goes into neutralization solution and after that it is generally goes into reactive soap solution. In zinc phosphate coating lines without reactive soap, neutralisation provides corrosion protection itself and deposites a carrier film on phospahte coating which has good holding ability of dry soaps. The treatment is made under conditions of %0,4 - 1,5 chemical concentration, 60 - 70 C degree temperature and 1 -28 minutes of treating time.


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