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Vehicle-specific phosphating solution and preparation method thereof

A phosphating solution and vehicle technology, which is applied in the coating process of metal materials, etc., can solve the problems of not being suitable for low-temperature phosphating, high phosphating temperature, impact resistance of paint film or weak adhesion, etc.

Active Publication Date: 2017-09-22
DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the common problems of domestic phosphating technology are: high phosphating temperature, short service life of phosphating solution, difficult washing and water pollution, which not only bring burden to environmental governance but also consume a lot of water, phosphate and other resources
Most of the existing ternary Zn-Ca-Mn phosphating solutions have the problems of poor stability of phosphating film, poor alkali resistance, and weak or poor impact resistance or adhesion of the paint film after painting
[0004] Chinese patent application CN101029386A discloses a kind of calcium-zinc-manganese-containing ternary cationic phosphating solution for steel plate and galvanized sheet treatment, although the phosphating solution has fast phosphating film formation speed and good compatibility with electrophoretic coating, but The concentration of the phosphating solution is high, the cost is high, and the working temperature is between 40 and 60°C, which is not suitable for the requirements of low temperature phosphating

Method used

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  • Vehicle-specific phosphating solution and preparation method thereof
  • Vehicle-specific phosphating solution and preparation method thereof
  • Vehicle-specific phosphating solution and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the volume of the phosphating solution, calculate the amount of each component. Based on 1000L phosphating solution, first add water to 45% of the volume of the phosphating tank, add 6.5kg of zinc oxide, and 15kg of phosphoric acid with a mass concentration of 85%. 15kg of nitric acid, 1.1kg of ethylenediaminetetraacetic acid, 0.7kg of citric acid, 0.5kg of tartaric acid and 0.2kg of phytic acid with a mass concentration of 75% were added in sequence, and stirred evenly, then 2.5kg of calcium nitrate and 3kg of manganese nitrate were added , 12kg of zinc dihydrogen phosphate, 6.5kg of manganese dihydrogen phosphate and 3.5kg of polyvinylpyrrolidone were stirred and dissolved, and then 0.3kg of polyaluminium chloride, 1.0kg of polyacrylamide and 8kg of polyhydroxy carboxylic acid compound were added successively, and polyhydroxy carboxylic acid compound The composition is HEDP 22wt%, polyacrylic acid 4wt%, water 74wt%, finally add water to the specified volum...

Embodiment 2

[0023] Calculate the amount of each component according to the volume of the phosphating solution required. In terms of 1000L phosphating solution, first add water to 45% of the volume of the phosphating tank, add 10kg of zinc oxide, 35kg of phosphoric acid with a mass concentration of 85%, Add 16kg of nitric acid, 0.7kg of ethylenediaminetetraacetic acid, 3.5kg of citric acid, 0.6kg of tartaric acid and 0.8kg of phytic acid with a mass concentration of 75% in sequence, and stir evenly, then add 1.5kg of calcium nitrate and 2.5kg of manganese nitrate , zinc dihydrogen phosphate 15kg, manganese dihydrogen phosphate 6kg and polyvinylpyrrolidone 4.6kg were stirred and dissolved and then added polyaluminum chloride 0.1kg, polyacrylamide 0.6kg and polyhydroxy carboxylic acid compound 6kg, polyhydroxy carboxylic acid compound The composition is 22wt% of HEDP, 4wt% of polyacrylic acid and 74wt% of water. Finally, water is added to make up the volume to the specified volume, stirred ev...

Embodiment 3

[0025] According to the volume of the phosphating solution, calculate the amount of each component. In terms of 1000L phosphating solution, first add water to 45% of the volume of the phosphating tank, add 6kg of zinc oxide, 35kg of phosphoric acid with a mass concentration of 85%, Add 13kg of nitric acid, 2kg of ethylenediaminetetraacetic acid, 0.5kg of citric acid, 2.6kg of tartaric acid and 0.1kg of phytic acid with a mass concentration of 75% in sequence, and stir evenly, then add 3.0kg of calcium nitrate, 2.5kg of manganese nitrate, 12.0 kg of zinc dihydrogen phosphate, 4 kg of manganese dihydrogen phosphate and 3.0 kg of polyvinylpyrrolidone were stirred and dissolved, and then 0.2 kg of polyaluminum chloride, 0.9 kg of polyacrylamide and 8 kg of polyhydroxy carboxylic acid compound were added successively. The composition is 20wt% of HEDP, 4wt% of polyacrylic acid, and 76wt% of water. Finally, water is added to make up the volume to the specified volume, stirred evenly, ...

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Abstract

The invention provides a vehicle-specific phosphating solution and a preparation method thereof, belonging to the field of industrial phosphating solutions. The phosphating solution includes phosphoric acid, nitric acid, zinc oxide, manganese dihydrogen phosphate, zinc dihydrogen phosphate, manganese nitrate, calcium nitrate, polyvinylpyrrolidone, polyhydroxy carboxylic acid compound, ethylenediaminetetraacetic acid, citric acid, tartaric acid, muscle acid Alcohol hexaphosphoric acid, polyaluminum chloride and polyacrylamide. The phosphating solution prepared by the method of the present invention has good stability, simple process operation, less phosphating residue, fast film forming speed, uniform and fine film layer, good corrosion resistance, and enhanced adhesion between metal parts and coatings. Moreover, the phosphating solution has the characteristics of saving materials and energy, reasonable functions, and the product does not endanger human health or damage the ecological environment during and after use; it is low in cost, easy to use, and can meet the requirements of industrialized production of vehicles.

Description

technical field [0001] The invention belongs to the field of industrial phosphating liquids, and in particular relates to a special phosphating liquid for vehicles and a preparation method thereof. Background technique [0002] As the bottom layer of the coating or the protective layer of the metal surface, the phosphating film 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. [0003] At present, the common problems of domestic phosphating technology are: high phosphating temperature, short service life of phosphating solution, difficult washing and water pollution, which not only bring burden to environmental governance but also consume a lot of water, phosphate and other resources . Most of the existing ternary Zn-Ca-Mn phosphating solutions have the problems of poor stability of the phosphating film, poor alkali resistance, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07
Inventor 唐洪林邓春阳
Owner DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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