Rapid zinc series, zinc-calcium series or iron series clean phosphatizing liquid under room-temperature with multiple styles

A phosphating solution, multi-method technology, applied in the direction of metal material coating process, etc., can solve the problems of poor phosphating quality, affecting the quality of phosphating film, and more slag, so as to achieve stable phosphating solution, save preparation time, and save energy effect

Inactive Publication Date: 2005-10-12
余取民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the phosphating solution used for spraying pretreatment generally needs to be washed with water after phosphating, otherwise the phosphating film will hang ash and the decomposition product of the accelerator in the phosphating solution (such as Cl after the reaction of sodium chlorate) - 、Na + Ions, additives (such as F - ions or fluorides) significantly affect the quality of the phosphating film; the phosphating temperature is basically above 15°C, and heating is generally required in winter; room temperature phosphating solution accelerators generally contain toxic Ni (nickel) and Cr (chromium) and carcinogenic and harmful Decomposition produces toxic gas nitrogen oxides (NO x ) of nitrite, poor phosphating quality, etc.; more sediment in the phosphating process, phosphating 1m 2 Produce several grams or more of sediment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Phosphating solution formula: ammonium dihydrogen phosphate [NH 4 h 2 PO 4 ]: 33.5g L -1 ; Ammonium heptamolybdate [(NH 4 ) 6 Mo 7 o 24 4H 2 O]: 8.5g L -1 ; Phytic acid (C 6 h 18 o 24 P 6 ): 3.0g L -1 ; Nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O]: 13.50g·L -1 ; With ammonia (NH 3 ·H 2 O) Adjust the pH to 5.0.

[0065] Phosphating conditions and results: Brush the test piece with working liquid at 10°C, then bake at 120°C for 10 minutes, after 30 minutes, the corrosion resistance time is 220s, and after 12 hours (hours), it is 320s; the adhesion reaches level 1.

Embodiment 2

[0067] Phosphating solution formula: zinc dihydrogen phosphate [Zn(H 2 PO 4 ) 2 ]: 27.8g L -1 ; Ammonium heptamolybdate: 8.1g L -1 ;Phytic acid: 1.0g·L -1 ; Calcium nitrate [Ca(NO 3 ) 2 ]: 5.8g L -1 ; Ammonium nitrate [NH 4 NO 3 ]: 2.1g L -1 ; Adjust the pH value to 2.4 with ammonia water.

[0068] Phosphating conditions and results: immerse the test piece in the phosphating working solution at 15°C, take it out after 5 minutes and bake it at 120°C for 8 minutes, after 30 minutes, it is detected that the corrosion resistance time is 120s, and the film weight is 1.25g m -2 , Adhesion up to level 1.

Embodiment 3

[0070] Phosphating solution formula: diammonium hydrogen phosphate [(NH 4 ) 2 HPO 4 ]: 16.0g·L -1 ; Ammonium nitrate: 4.5g L -1 ; Ammonium heptamolybdate: 8.0g L -1 ; with phosphoric acid (8 5% H 3 PO 4 ) to adjust the pH to 3.5.

[0071] Phosphating conditions and results: immerse the test piece in the phosphating working solution at 10°C for 5 minutes, take it out and bake it at 120°C for 10 minutes. After 30 minutes, it is detected that the corrosion resistance time is 138s, and the film weight is 0.81g m -2 , Adhesion up to level 1.

[0072] The invention is applicable to the phosphating treatment on the surface of steel such as cold-rolled plates, hot-rolled plates, and angle steels before spraying. The phosphating solution is composed of phosphoric acid, nitric acid or its ammonium, zinc, calcium, nickel, manganese salt and ammonium molybdate, ammonium tungstate, phytic acid, hydrogen peroxide, etc., and does not contain carcinogenic and toxic gas NO produced by ...

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Abstract

A phosphate solution of Zn Zn-Ca and Fe series. Contents of it are H3PO4, nitrate and their Zn2+,Ca2+,Mn2+,Ni2+ salts, ammonium molybdate, ammonium wolframate, phytic acid, H2O2 and non-ionic surface active agent. pH is 2.0-5.8.

Description

technical field [0001] The invention belongs to the technical field of phosphating treatment before steel surface spraying, and relates to a multi-mode, fast room-temperature zinc-based or zinc-calcium-based or iron-based clean phosphating solution. Background technique [0002] Phosphating treatment, with a history of more than 100 years, is a process in which metal workpieces are treated in a solution of metal or ammonium dihydrogen phosphate and accelerators as the main components, and a phosphating film is formed on the surface of the treated metal. The phosphating film has the functions of increasing the adhesion, corrosion resistance and protection, reducing friction and lubricating of the coating. Phosphating solution can be divided into zinc series, manganese series and iron series according to film-forming cations. [0003] Phosphating, when the steel surface contacts the phosphating solution, the following reactions occur: [0004] <chemistry num="001"> &...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 余取民
Owner 余取民
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