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  Application and reference of zinc phosphate in phosphating solution

Application and reference of zinc phosphate in phosphating solution

Metal surface in addition to oil, rust, in order to prevent re rusting, usually to chemical treatment, the metal surface form a layer of protective film, the film is usually only a few microns, which plays an important role in enhancing the role of coating and substrate adhesion and thicker film can enhance anti rust performance. Commonly used surface chemical conversion method has oxidation, phosphating, passivation three kinds of. The phosphating is chemical treatment of the central link, is a greatly improve workpiece metal corrosion resistance of simple, reliable, low cost, simple operation process, in the industry is widely used. 1, and phosphating process related standard metal (steel) after treatment solution containing zinc (Zn), manganese (MN), chromium (CR), iron (FE), phosphate, on the surface of the metal substrate formation a kind of insoluble phosphate film. This process known as parkerizing. Phosphating the metal surface to form a layer of attachment good protective film, zinc phosphate, for example, in the presence of oxidant, the generated phosphating film was zn3 (PO4) 2 - polar and Zn2Fe (PO4) - 2 - polar crystals. The phosphating film is flash light and gray porous (0.5%~1.5% of the void fraction), the film thickness is typically 0.1 - 50 m.

Liquid on the surface of metal materials for chemical conversion treatment with aqueous processing, aqueous treatment liquid containing zinc ion, phosphate ion, 50 150 ppm including at least one organic peroxides, such as tert butyl over alcohol chemical transformation accelerator, and optionally 0.5 - 5 grams / ascended to the surface live agent, to forming a zinc phosphate chemical conversion coating on the surface of metal materials. When the water content of the aqueous solution contains a surfactant, it can be cleaned and chemically transformed to the surface of the metal material..

Anti-corrosion passivation passivation agent anti-corrosion agent consisting mainly of zinc phosphate and sodium nitrite. They have good anti corrosion and anti rust and and phosphating film with good adhesion, enhances the phosphating film corrosion and rust resistant, passivation and antirust effect on film. (4) rust agent zinc phosphate, zinc chrome yellow rust stabilization stabilizer (active pigment) can be in the coating film by slow hydrolysis produce anions, anions and with lively rust formation of insoluble Heteropoly Complexes and chelates to the purpose of stable corrosion

The chemical composition (total acidity) of the international standard of phosphating solution is liquid state:

A. (about 20%) zinc phosphate + two hydrogen phosphate (about 35%) (about 35%) + + zinc nitrate zinc phosphate (ineffective components about 10%)

B. (about 20%) zinc phosphate + two hydrogen phosphate (about 45%) + zinc nitrate (about 35%)

Note: the chemical products of the dictionary of physical properties

Two hydrogen phosphate zinc 1 is white crystal or sticky liquid, soluble in water and acid, acidic aqueous solution. As the main component of phosphating coating agent, corrosion inhibitor for steel.

2. Zinc phosphate is a kind of colorless orthorhombic crystal or white crystalline powder, soluble in inorganic acid (hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid); insoluble in ethanol, water is almost insoluble, its solubility with temperature rising and reduce.

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