Normal temperature barium salt modified phosphorizing liquid capable of avoiding water wash after phosphorized

A technology of phosphating solution and barium salt, which is applied in the coating process of metal materials, etc., can solve the problems of unacceptable quality of phosphating film, short life of phosphating solution, poor phosphating quality, etc., and achieve excellent corrosion resistance, sediment The effect of less and material consumption reduction

Inactive Publication Date: 2008-01-23
余取民 +3
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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 film-forming reaction in the phosphating solution, degreasing and rust removal, and SO 4 2- , Cl - 、Na + And certain additives (such as fluorine-containing compounds) in the phosphating solution will cause unacceptable defects in the quality of the phosphating film (film rust, looseness, serious ash), and washing with water will change the phosphating solution, which accounts for more than 20% of the total consumption. become pollutants to be treated, waste materia

Method used

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  • Normal temperature barium salt modified phosphorizing liquid capable of avoiding water wash after phosphorized
  • Normal temperature barium salt modified phosphorizing liquid capable of avoiding water wash after phosphorized
  • Normal temperature barium salt modified phosphorizing liquid capable of avoiding water wash after phosphorized

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Phosphating solution formula: zinc oxide [ZnO]: 5.5g L -1 ; Industrial phosphoric acid [H 3 PO 4 ]: 23.5g L -1 ; Ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 4H 2 O]: 2.0g L -1 ; Barium nitrate [Ba(NO 3 )2]: 3.50g L -1 ; Nickel nitrate [Ni(NO 3 ) 2 ·6H 2 O]: 2.50g·L -1 ; Phytic acid (C 6 h 18 o 24 P 6 ): 1.5g L -1 ; With ammonia (NH 3 ·H 2 O) Adjust the pH to 2.9.

[0069] Phosphating conditions and results: dipping and phosphating at 10°C for 600s, and then drying naturally for 3 hours to obtain a continuous and uniform colored phosphating film without quality defects, and then tested for corrosion resistance time of 85s; adhesion reached level 1.

Embodiment 2

[0071] Phosphating solution formula: zinc oxide [ZnO]: 3.5g L -1 ; Industrial phosphoric acid [H 3 PO 4 ]: 23.5g L -1 ; Calcium nitrate [Ca(NO 3 ) 2 4H 2 O]: 3.5g L -1 ; Nickel nitrate [Ni(NO 3 ) 2·6H 2 O]: 2.50g·L -1 ; Ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 4H 2 O]: 2.30g·L -1 ; Barium nitrate [Ba(NO 3 ) 2 ]: 0.60g·L -1 ; Phytic acid (C 6 h 18 o 24 P 6 ): 1.0g·L -1 ; With ammonia (NH 3 ·H 2 O) Adjust the pH to 2.6.

[0072] Phosphating conditions and results: dipping and phosphating at 30°C for 400s, and then drying naturally for 3 hours to obtain a continuous and uniform colored phosphating film without quality defects, and then tested for corrosion resistance time of 135s; adhesion reached level 1.

Embodiment 3

[0074] Phosphating solution formula: zinc oxide [ZnO]: 3.0g L -1 ; Calcium nitrate [Ca(NO 3 ) 2 4H 2 O]: 2.0g; industrial phosphoric acid [H 3 PO 4 ]: 21.5g L -1 ; Manganese dihydrogen phosphate [Mn(H 2 PO 4 ) 2 ·H 2 O]: 1.5g L -1 ; Ammonium molybdate [(NH 4 ) 6 Mo 7 o 24 4H 2 O]: 0.30g·L -1 ; Barium nitrate [Ba(NO 3 ) 2 ]: 1.30g·L -1 ; Phytic acid (C 6 h 18 o 24 P 6 ): 1.2g L -1 ; With ammonia (NH 3 ·H 2 O) Adjust the pH to 2.3.

[0075] Phosphating conditions and results: Spray phosphating at 20°C for 60s, and dry naturally for 3 hours to obtain a continuous and uniform color phosphating film without quality defects, and then check that the corrosion resistance time is 65s; the adhesion reaches level 1.

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Abstract

The invention relates to a phosphating washing-free phosphating solution modified with barium salt at ambient temperature. The phosphating solution comprises a phosphoric acid, a nitric acid, and Zn2+, Ca2+, Mn2+, Ni2 plus salt thereof, ammonium molybdate,ammonium tungstate, phytate, H2O2 and barium nitrate or barium hydroxide. The pH value ranges from 1.6 to 4.2. The invention can be phosphated under soak, rinse, brush or the combined way thereof at 3 DEG C.to 45 DEG C.. The phosphating solution is stable and capable of automatically precipating and removing the SO42- inside the phosphating solution and therefore eliminating the influence of SO42- on quality; the phosphorizating membrane is continues, uniform and compact, the membrane weight is between 0.5g is multiplied by m and 3.0g is multiplied by m minus 2 and the iron-red epoxy primer is sprayed and the adhesion thereof can be 1 grade.

Description

technical field [0001] The invention belongs to the technical field of iron and steel surface phosphating treatment, and relates to a normal-temperature barium salt modified phosphating solution that can be washed without water after phosphating. 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 composed of metal or ammonium dihydrogen phosphate, oxidant, and film-forming aids, and a phosphating film is formed on the surface of the treated metal. The phosphating film as the bottom layer of the coating can significantly increase the adhesion, protection ability and other properties of the coating. [0003] Phosphating, when the steel surface contacts the phosphating solution, the following reactions occur ([O] represents the oxidizing agent and dissolved oxygen in the phosphating solution): [0004] Fe+[O]+H 2 O → Fe 2+ +2OH - [0005] 2Fe 2+ +[O]+H 2 O→2Fe 3+ +2...

Claims

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Application Information

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IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 余取民张世英李佑稷李荣喜
Owner 余取民
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