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Method for preparing nigrescent phosphatizing solution

A phosphating solution and solution technology, applied in the field of surface chemistry, can solve the problems of poor corrosion resistance, long film formation time, and unattractive color, and achieve the effects of good adhesion and corrosion resistance, dense film formation, and convenient use.

Inactive Publication Date: 2008-02-27
冯为民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Publication number as the patent of " black phosphating solution and preparation method thereof " of CN1077757 disclosed on October 27, 1993 as Chinese patent, its pretreatment solution uses the pretreatment solution that zinc ion, calcium ion and nickel ion form, but When the technology of this invention is used in the phosphating of metal parts, the phosphating film produced is gray or dark gray, the color is not beautiful enough, and the decorative effect is not very good
For example, the phosphating solution and its process disclosed in the Chinese patent CN1231705 have a relatively high cost at a temperature of 15-75°C, a long film-forming time, loose film formation, and poor corrosion resistance, which cannot meet the requirements of high corrosion resistance and aesthetics. Require

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0008] First add 46% water into the reaction kettle, then add 6% zinc oxide, and stir evenly during the addition; after making slurry, add 30% phosphoric acid to the slurry solution, and stir evenly. After the solution is clarified, Add 12% zinc nitrate to the solution, stir until the zinc nitrate is completely dissolved; then, gradually add 0.2% nickel nitrate, 0.9% citric acid, 0.7% sodium fluoroborate, 1.2% sodium m-nitrobenzenesulfonate , 3% sodium tungstate, stir evenly during the adding process, after the material in the previous step is dissolved, then add the material in the next step.

Embodiment 2

[0010] First add 26.7% water into the reaction kettle, then add 8% zinc oxide, and stir evenly during the addition; after making slurry, add 35% phosphoric acid to the slurry solution, and stir evenly. After the solution is clarified, Add 20% zinc nitrate to the solution, stir until the zinc nitrate is completely dissolved; then, gradually add 0.5% nickel nitrate, 1.8% citric acid, 1.1% sodium fluoroborate, 1.9% sodium m-nitrobenzenesulfonate , 5% sodium tungstate, stir evenly during the adding process, after the material in the previous step is dissolved, then add the material in the next step.

Embodiment 3

[0012] First add 36.8% water into the reaction kettle, then add 7% zinc oxide, and stir evenly during the addition; after making slurry, add 32% phosphoric acid to the slurry solution, and stir evenly. After the solution is clarified, Add 16% zinc nitrate to the solution and stir until the zinc nitrate is completely dissolved; then, add 0.3% nickel nitrate, 1.4% citric acid, 0.9% sodium fluoroborate, and 1.6% sodium m-nitrobenzenesulfonate in sequence , 4% sodium tungstate, stir evenly during the adding process, and add the materials in the next step after the materials in the previous step are dissolved.

[0013] Degrease, wash, and derust the parts to be treated. After washing, put the metal parts to be phosphating into the treatment solution at room temperature for 2 minutes, take them out, and wash them with water. Then, put the parts into the phosphating solution Treat in middle temperature for 10 minutes, take out and wash with water, seal the hole, wash with water and d...

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Abstract

The present invention relates to a blackening phosphating solution for phosphating metal surface. Its raw material composition contains (by wt%) 30%-35% of phosphoric acid, 6%-8% of zinc oxide, 12%-20% of zinc nitrate, 0.9%-1.8% of citric acid, 0.2%-0.5% of nickel nitrate, 0.7%-1.1% of sodium fluoroborate, 1.2%-1.9% of sodium m-nitrobenzenesulfonate, 3%-5% of sodium tungstate and the rest is water. Besides, said invention also provides its preparation method and concrete operation steps.

Description

technical field [0001] The invention belongs to the technical field of surface chemistry, in particular to a pretreatment solution of black phosphating solution for phosphating the surface of iron and steel. Background technique [0002] At present, the phosphating treatment is carried out on the metal surface, and the phosphating film can be used as a paint base layer to improve the adhesion and corrosion resistance of the paint film, or as an oil-holding medium on the bearing and sliding surface to eliminate wear and tear, and can also be used It is used for metal cold processing operations such as wire drawing, pipe drawing, and cold extrusion, or as an oil-holding layer to cooperate with anti-rust oil for anti-corrosion. With the development of phosphating process technology, the requirements for phosphating film are getting higher and higher, and sometimes black phosphating treatment is required for aesthetic or visual requirements. Publication number as the patent of ...

Claims

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Application Information

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IPC IPC(8): C23C22/07
Inventor 冯为民
Owner 冯为民
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