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Normal temperature calcium-manganese phosphorizing liquid

A calcium-based phosphating liquid and phosphating liquid technology, applied in the direction of metal material coating process, etc., can solve the problem of poor impact resistance or adhesion of paint film, scrapping after more than 100 hours of use, and short service life of phosphating liquid and other problems, to achieve the effect of saving preparation time, saving materials, and phosphating solution stability

Inactive Publication Date: 2012-10-24
CHANGSHA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic phosphating technology is common: the phosphating temperature is high, the service life of the phosphating solution is short (some are even scrapped after more than 100 hours of high-frequency use), and one or more water washings are required after phosphating to remove the impurities on the surface of the workpiece. NO 2 – , NO 3 – , F – , SO 4 2– and the residual phosphating solution with higher concentration of salt to avoid corrosion of phosphating film and serious ash
The amount of washing water is large, and the washing water contains P, N, Zn, COD, BOD and other harmful substances that will cause eutrophication of the water body. It must be treated before discharge, which not only increases the burden of environmental governance, but also consumes water, phosphate and other resources.
[0008] In addition, no special Mn-based 2+ , Ca 2+ Combination is the manganese-calcium series phosphating solution report of the main film-forming metal cations. Patent document CN1680623A discloses a multi-mode, fast room temperature zinc-based or zinc-calcium-based or iron-based clean phosphating solution. The phosphating solution components Can contain Zn in 2+ , Mn 2+ , Ca 2+ , but its original meaning is still the combination of traditional phosphating cations, that is, the composition of Zn system, Zn-Ca system, Mn system, Zn-Mn or Mn-Zn system, ternary Zn-Ca-Mn system phosphating solution, using these phosphating The phosphating film formed by the liquid has the problem that the alkali resistance is not very good, and sometimes the impact resistance or adhesion of the paint film is not strong or poor after spraying.

Method used

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  • Normal temperature calcium-manganese phosphorizing liquid

Examples

Experimental program
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Effect test

Embodiment 2

[0065] Phosphoric acid (85%) 5.5 g / L, manganese dihydrogen phosphate dihydrate 15.0 g / L, manganese nitrate solution (50%) 4.0 g / L, ammonium molybdate tetrahydrate 0.9 g / L, calcium nitrate tetrahydrate 2.5 g / L L, barium nitrate 1.2 g / L, sodium fluoroborate 0.1 g / L, citric acid 0.2 g / L, tartaric acid 0.1 g / L, sodium benzoate 0.1 g / L, adjust the pH value to 2.4~2.6 with ammonia water.

[0066] Immerse the test piece in the above phosphating working solution at 10°C, take it out after 8 minutes and let it dry naturally for 8 hours, the effect is the same as that in Example 1.

Embodiment 3

[0068] Phosphoric acid (85%) 9.0 g / L, manganese dihydrogen phosphate dihydrate 11.3 g / L, calcium nitrate tetrahydrate 5.0 g / L, ammonium molybdate tetrahydrate 1.2 g / L, tartaric acid 0.2 g / L, phytic acid (70 %) 0.2 g / L, hydrogen peroxide (30%) 0.1 g / L, sodium benzoate 0.1 g / L, adjust the pH value to 2.6~2.9 with ammonia water.

[0069] Immerse the test piece in the above-mentioned phosphating working solution at 20°C, take it out after 6 minutes and let it dry naturally for 8 hours, the effect is the same as that in Example 1.

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Abstract

The invention discloses normal temperature calcium-manganese phosphorizing liquid, which comprises Mn<2+>, Ca<2+> and sodium benzoate or benzoic acid or nickel nitrate. The environment-friendly calcium-manganese phosphorizing liquid provided by the invention can be used at normal temperature, and has the advantages of no surface adjusting process before phosphorizing and no washing process after phosphorizing, simple operation, long service life and excellent effect, when the generated phosphorizing membrane is taken as a coating basement, the coating has good adhesive force, thereby overcoming the problems of complicated conventional phosphorizing process, higher phosphorizing liquid temperature, large consumption of water and phosphate, much harmful wastewater and the like. The phosphorizing liquid is suitable for surface treatment before coating the surface of black metal steel, and the generated phosphorizing film is used as a basement of the coating.

Description

technical field [0001] The invention belongs to the field of environment-friendly phosphating for pretreatment of the surface of ferrous metals and steels, and in particular relates to a manganese-calcium-based phosphating solution at room temperature. Background technique [0002] Phosphating treatment, with a history of more than 160 years, is a process in which metal workpieces are treated in a solution of dihydrogen phosphate and accelerator as the main components, and a conversion film called a phosphating film is formed on the surface of the treated metal. Phosphating film as the bottom layer of the coating can significantly improve the adhesion, corrosion resistance and protective performance of the coating, and is widely used in automobiles, home appliances, machinery, military and other industries. Phosphating can be divided into zinc-based, manganese-based, iron-based, zinc-calcium-based and other types according to film-forming cations; according to phosphating tr...

Claims

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Application Information

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IPC IPC(8): C23C22/44
Inventor 余取民鲁双庆刘迎新李荣喜
Owner CHANGSHA UNIVERSITY
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