CN1361309A - Medium-temperature phosphorizing liquid for automobile painting - Google Patents

Abstract

The improve medium temperature phosphorizing liquid for automobile painting consists of phosphoric acid 13-18 wt%, zinc nitrate 16-24 wt%, manganese nitrate 3.0-6.0 wt%, nickel nitrate 1.2-1.8, and organic promoter in small amount other than water. The phosphorizing liquid contains no chromium salt and nitrite and its use needs no replacement but replenishment, and this makes no effluent to pollute environment. In addition, it can maintain its magnetizing effect for years.

Description

The painting dressing automobiles medium temperature phosphating solution

What the present invention relates to is application production metal conditioner, particularly painting dressing automobiles medium temperature phosphating solution.

Products such as the automobile that modern industry is produced, motorcycle, washing machine, refrigerator, power distribution cabinet when spraying paint application, all must carry out bonderizing to part, to improve the stability and the erosion resistance of paint film.At present, Chang Yong phosphatization liquid is to contain zinc, the isoionic phosphoric acid compositions of chromium.The phosphatization weak effect of this phosphatization liquid uses component many, adjusts complexity, troublesome poeration, and the working temperature height contains chromic salts and nitrite, waste liquor contamination environment, difficult treatment.Chinese patent has been announced a kind of zinc-manganese-nickel ternary medium temperature phosphating solution (application number is 97109346), though this phosphatization liquid phosphatization is effective, the phosphatize phosphate coat homogeneity that forms is relatively poor.

It is low to the purpose of this invention is to provide a kind of working temperature, and phosphorization capacity is strong, and phosphatize phosphate coat is even, and production cost is low, simple to operate, adjusts easily, does not contain the painting dressing automobiles phosphatization liquid of chromic salts and nitrite.

The present invention realizes like this.It is a kind of be composition based on phosphoric acid, zinc nitrate, its one-tenth is grouped into weight percent and is:

Phosphatase 11 3--18, primary zinc phosphate 5--8, zinc nitrate 16--30, manganous nitrate 2.0--5.0, nickelous nitrate 1.5--3, the 0.1--0.5 organic promoter, all the other are water.

Manner of formulation of the present invention is: gets 2/3 deionized water, adds phosphoric acid, add zinc nitrate more in order respectively, and manganous nitrate, nickelous nitrate, must fully stir each the adding all, behind sedimentation and filtration, supplies all the other moisture content and get final product.Use after slaking in surplus in the of ten days, effect is better.

Working parameter of the present invention is:

Temperature 55--65 ℃, free acid 7.5--8.8 degree, total acidity 70--85 degree, time 3--6 minute.

With the present invention workpiece is carried out bonderizing, its phosphate coating densification, equilibrium after the normal pre-treatment of metal products before phosphatization (sandblast, degreasing, table are transferred, flushing).After applying paint, detect through sticking power repeatedly, salient features test such as 240 hours salt fogs and the circulation of 30 alternations are corrosion-resistant has all reached the technical requirements of car coating.

This phosphatization liquid processing range broad, component is few, adjusts easily, and is simple to operate, can not add any promotor at work, free from environmental pollution.Use for many years, replenish the phosphatization liquid, do not change tank liquor, still can keep good phosphatization effect except that normal.

The present invention is further described with embodiment below.

Embodiment one.Get the 600g deionized water, get 130g phosphoric acid, the 50g primary zinc phosphate adds in the entry, fully stirs; Get zinc nitrate 160g, add in the entry, fully stir; Get the 20g manganous nitrate, add in the entry, fully stir; Get the 15g nickelous nitrate, add in the entry, fully stir; Add the 1g organic promoter, fully stir once more; Left standstill 4 hours, and supplied moisture content after filtering to 1000g.Used in ten days through slaking, the workpiece through the phosphatization pre-treatment is carried out bonderizing, flood, all can spray, the phosphate coating even compact, the phosphatization effect is fine.

Embodiment two.Get the 450g deionized water, get 180g phosphoric acid, the 80g primary zinc phosphate adds in the entry, fully stirs; Get zinc nitrate 300g, add in the entry, fully stir; Get the 50g manganous nitrate, add in the entry, fully stir; Get the 30g nickelous nitrate, add in the entry, fully stir; Add the 5g organic promoter, fully stir once more; Left standstill 4 hours, and supplied moisture content after filtering to 1000g.Used in ten days through slaking, the workpiece through the phosphatization pre-treatment is carried out bonderizing, flood, all can spray, the phosphate coating even compact, the phosphatization effect is fine.

Claims (2)

1, a kind of painting dressing automobiles medium temperature phosphating solution is the combination solution based on phosphoric acid, zinc nitrate, it is characterized in that becoming to be grouped into weight percent is:

Phosphatase 11 3--18, primary zinc phosphate 5--8, zinc nitrate 16--30, manganous nitrate 2.0--5.0, nickelous nitrate 1.5--3, the 0.1--0.5 organic promoter, all the other are water.

2, painting dressing automobiles medium temperature phosphating solution according to claim 1 is characterized in that working parameter is: temperature 55--65 ℃, and free acid 7.5--8.8 degree, total acidity 70--85 degree.