AMANTECH

(C.I. PIGMENT WHITE 32)

ZINC PHOSPHATE 1520

C.I. Constitution Number: 77964

• Zinc Phosphate is a valuable corrosion resistent Pigment and is extensively used in the developed countries.

MAIN END USE APPLICATION(S):

• ANTI-CORROSIVE PIGMENT

CHEMICAL NATURE:

• This Pigment is essentially Zinc Phosphate Dihydrate and corresponds to the formula Zn₃(PO₄)₂ . 2H₂O. It is a white, non toxic Pigment and is prepared by precipitation.

CHARACTERISTICS & ANALYTICAL DETAILS:

Description : White, Micro-Crystallian Powder

Chemical Formula : Zn₃ (PO₄ )₂ . 2H2O

Residue on Sieve of 240 Mesh : 0.5 % Max

Specific Gravity : 3.3

Bulk Density : 0.6 to 0.9 g/ml

Oil Absorption : 19 ± 12 Gm of Oil per 100 Gm of Pigment

Loss on Ignition : 8.5 to 10 % by Mass

Matter soluble in water : 0.5 % Max

Zinc content of Ignited sample : 50.5 to 52.0 % by Mass

COLOR:

• Zinc Phosphate is white in appearance and of low opacity, making it adaptable to wide range of colours, by incorporating other pigments.

NON-TOXICITY:

• Both red lead and calcium plumbate pigments are toxic. this not only limits their usage, but means that they can only be sprayed with elaborate precautions. Primers containing Zinc Phosphate are not toxic.

PERFORMANCE:

• Standard corrosion control tests can be misleading when evaluating the performance of Zinc Phosphate-based Primers. The Girder Test and performance are more reliable guides.

APPLICATIONS:

• It is compatible with a vide variety of media including alkyds epoxy esters, chlorinated rubber, polyurethene etc. Though the exact mechanism is not thoroughly understood, it is probable that, due to its slight solubility Zinc Phosphate reacts by polarising both anodic and cathodic areas. The Pigment also physically prevents passage of water and salts. Thus the corrosion resistance characteristics of Zinc Phosphate Pigment factors.
• Zinc Phosphate is used in corrosion resisting primers and undercoats.Good brushing characteristics can be obtained with Zinc Phosphate Primers, which are suitable for both airless and conventional spray application. None of these methods entails a health hazard.
• In contrast with the majority of red lead primers which are formulated in slow drying oils, it is now possible to formulate a 2-hour overcoatable paint based on Zinc Phosphate, without detriment to its anti-corrosive properties.

MECHANISM OF CORROSION PROTECTION:

• A number of explanations have been put forward about the effectiveness of Zinc Phosphate in inhibiting rust formation. Among these are suggestions that it reduces the diffusion rate of ammonium ions through paint film, that it slowly "phosphates" the metal surface, rendering it passive, or that, as a result of complex formation between Zinc Phosphate and the media, a highly stable film is produced.

ADVANTAGES:

1. Zinc Phosphate has the advantage of bright white colour and non toxic nature over other Corrosion Resistant Pigments much as Zinc Chromate, Zinc Tetroxy Chromate and Barium Chromate.
2. The use of Zinc Phosphate in Primers promotes excellent inter-coat adhesion, particularly under conditions of high humidity.

COST:

• The lower price of Zinc Phosphate relative to that of red lead on a volume basis, could contribute significantly to savings in manufacturing costs. Paint systems incorporating Zinc Phosphate Primers are generally comparable in cost to those utilising other types of primer.

IMPORTANT NOTES:

• The tests and results shown were conducted in our laboratories. They do not constitute a guarantee and it is suggested that you carry out your own evaluations prior to the adoption of these products.
• The products are offered without patent protection. For this reason and before submitting orders, it is purchaser responsibility to ensure that products requested are not covered by any patent in his country.

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