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|CAS No.:||7779-90-0||Grade:||Industrial Grade|
|1.Application:||Antirust Paint. Antirust Coating||2.Application:||Phosphating Treatment Of Steel And Flame Retardant Of Polymer Materials|
anti rust zinc phosphate pigment,
cas no 7779-90-0 zinc phosphate pigment
Zinc phosphate is widely used as a chemical anti-rust pigment in oily and water-based primers
Zinc phosphate is an important anti-rust pigment. It is one of the substitutes for lead and chromium anti-rust pigments in the paint industry. It has been used since 1965 and is widely used in oil-based and water-based primers as chemical anti-rust pigments. To improve and improve its anti-rust performance, it is currently the most widely used non-toxic anti-rust pigment. In addition to being environmentally friendly and non-toxic, zinc phosphate also has the following advantages:
White or light color, low refractive index, so it is very easy to color; can be dispersed in various base materials such as oil-based resin and water-based; coatings prepared with it have good construction performance, and can be combined with metal substrates or surface The paint film has strong adhesion.
Mechanism: Standard zinc phosphate antirust pigment is zinc orthophosphate white powder, mainly dihydrate type (Zn3 (PO4) 2.2H2O) and mixed type of dihydrate and tetrahydrate (Zn3 (PO4) 2.4H2O) . Its anti-rust mechanism is very complicated. The main anti-rust mechanism of zinc orthophosphate pigment:
［Fe(H2O)6］ 2+→ ［Fe(H2O)5(OH)］ ++H+
Zn3(PO4)2+H+→H3PO4 ＋ Zn2+
The dissolved ferrous salt and iron salt are hydrolyzed to release protons, and then gradually react with zinc orthophosphate to sequentially generate water-soluble first-generation ferrous phosphate and second-generation ferrous phosphate, and finally insoluble third-generation ferrous phosphate. Passivation occurs on the surface of the metal substrate to produce Me (metal) -Zn-P2O5, a phosphating film with complex, dense and strong adhesion.
a) In addition to phosphating, they can also react with the carboxyl and hydroxyl groups in the base material and certain ions in the corrosive environment to form complexes, and this complex can react with corrosion products. A tightly adhered protective film is formed on the surface of the material.
b) The anti-rust effect of zinc orthophosphate is mainly due to the presence of crystal water, which slowly hydrolyzes to form zinc hydroxide and zinc diphosphate ions, the latter through the formation of a protective film composed of a complex with adhesive corrosion inhibition And realize anode protection.
c) Zinc orthophosphate slows down the diffusion rate of ammonium ions through the coating film, thereby playing a corrosion inhibitory effect.
3.Zinc phosphate chemical examination report:
|TEST ITEM||O-leve||Superfine level||50.5%containing zinc||High purity||Low heavy metal and superfine|
|Oil absorption ml/100g||30±5||30±5||30±5||30±5||30±5|
|Residue on sieve 45μm||≤0.5||≤0.5||≤0.5||≤0.05||≤0.05|
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