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Phosphating solution for electrophoresis and preparation method thereof

A phosphating solution and electrophoresis technology, applied in electrophoretic plating, electrolytic coatings, metal material coating processes, etc., can solve the problems of uneven coating layer, corrosion, poor alkali resistance, etc., to achieve uniform phosphating coating layer, Effects of improved corrosion resistance and improved alkali resistance

Inactive Publication Date: 2018-01-19
北京雁阳汽车配件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the process of spraying the base metal in the phosphating solution, the phosphating layer often has a large thickness, poor alkali resistance, and is not dense. In the subsequent electrophoresis process, the base metal will not only corrode in the electrophoretic solution At the same time, it will lead to uneven and non-dense coating layer, thereby reducing the anti-corrosion ability of the car body

Method used

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  • Phosphating solution for electrophoresis and preparation method thereof
  • Phosphating solution for electrophoresis and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Premixing: Take 35kg of zinc oxide, 225kg of phosphoric acid, 16kg of magnesium stearate, 15kg of polyoxyethylene sorbitan laurate, and 380kg of water and stir until dissolved to obtain a premixed solution. The premixed temperature is 45°C and the stirring time is 15min;

[0026] Mixing: Add 35 kg of manganese dihydrogen phosphate, 5 kg of tartaric acid, 10 kg of hydrochloric acid, and 23 kg of sodium nitrite to the premixed solution, and stir evenly until the reaction is complete to obtain a phosphating solution. The mixing temperature is 37°C and the stirring time is 25 minutes;

[0027] Wherein, the concentration of phosphoric acid is 0.8g / L, the concentration of tartaric acid is 0.2g / L, and the concentration of hydrochloric acid is 0.3g / L.

Embodiment 2

[0029] Premixing: Take 30kg of zinc dihydrogen phosphate, 210kg of phosphoric acid, 13kg of aluminum stearate, 15kg of polyoxyethylene sorbitan laurate, 12kg of ethylene glycol stearate, and 400kg of water and stir until dissolved , to obtain a premix solution, wherein the premix temperature is 48°C, and the stirring time is 10min;

[0030] Mixing: Add 35kg of manganese hypophosphite, 7kg of tartaric acid, 6kg of hydrochloric acid, and 20kg of potassium nitrite to the premixed solution, and stir evenly until the reaction is complete to obtain a phosphating solution, wherein the mixing temperature is 35°C and the stirring time is 20 minutes;

[0031] Wherein, the concentration of phosphoric acid is 0.8g / L, the concentration of tartaric acid is 0.2g / L, and the concentration of hydrochloric acid is 0.3g / L.

Embodiment 3

[0033] Premixing: Take 30kg of zinc dithiophosphate, 240kg of phosphoric acid, 13kg of magnesium stearate, 12kg of polyoxyethylene sorbitan laurate, and 400kg of water and stir until dissolved to obtain a premixed liquid, wherein the premixed temperature is 42°C. Stirring time is 20min;

[0034] Mixing: Add 40kg of manganese carbonate, 7kg of tartaric acid, 6kg of hydrochloric acid, and 26kg of potassium nitrite to the premixed solution, and stir evenly until the reaction is complete to obtain a phosphating solution. The mixing temperature is 35°C and the stirring time is 20 minutes;

[0035] Wherein, the concentration of phosphoric acid is 0.8g / L, the concentration of tartaric acid is 0.2g / L, and the concentration of hydrochloric acid is 0.3g / L.

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Abstract

The invention relates to a phosphating solution for electrophoresis. The phosphating solution for electrophoresis is prepared from the following raw materials in parts by weight: 30-40 parts of zinc salt, 30-40 parts of manganese salt, 210-240 parts of phosphoric acid, 9-21 parts of a complexing agent, 13-19 parts of a stabilizer, 20-26 parts of an accelerant and 12-18 parts of a dispersant. The dispersant is polyoxyethylene sorbitol anhydride laurate or stearic acid-1,2-gylcol ester. The phosphating solution can form a uniform and compact phosphating film on the surface of a matrix metal, sothat the alkali resistance of the matrix metal is improved, and therefore, the corrosion resistance of a coating is improved.

Description

technical field [0001] The invention relates to the field of metal surface chemical treatment, more specifically, it relates to a phosphating solution for electrophoresis and a preparation method thereof. Background technique [0002] Automotive coatings must have good corrosion resistance, water resistance, oil resistance, acid and alkali resistance, weather resistance and certain mechanical strength, so as to ensure that the base metal can be used for a long time. At present, electrophoretic coating is a common metal surface coating method. The method is to immerse the conductive base metal in an electrophoretic coating tank diluted in water and have a relatively low concentration as an anode or cathode, and an additional phase is set in the tank. For the corresponding cathode or anode, a direct current is passed between the two poles for a certain period of time, so that a uniform insoluble coating film is deposited on the metal substrate. [0003] In order to ensure tha...

Claims

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Application Information

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IPC IPC(8): C25D13/20C23C22/18
Inventor 孔令全
Owner 北京雁阳汽车配件有限责任公司
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