Special phosphating solution for car and preparing method of phosphating solution

A phosphating fluid and vehicle technology, applied in the direction of metal material coating process, etc., can solve the problems of poor impact resistance or adhesion of paint film, short service life and consumption of phosphating fluid

Active Publication Date: 2015-10-07
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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  • Special phosphating solution for car and preparing method of phosphating solution
  • Special phosphating solution for car and preparing method of phosphating solution
  • Special phosphating solution for car and preparing method of phosphating solution

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 special phosphating solution for cars and a preparing method of the phosphating solution, and belongs to the field of industrial phosphating solutions. The phosphating solution comprises phosphoric acid, nitric acid, zinc oxide, manganous dihydrogen phosphate, zinc dihydrogen phosphate, manganous nitrate, calcium nitrate, polyvinylpyrrolidone, polyhydroxy carboxylic acid compound, ethylenediamine tetraacetic acid, citric acid, tartaric acid, phytic acid, aluminium polychlorid and polyacrylamide. The phosphating solution prepared by the method is good in stability, simple in process operation, less in phosphating sediment, fast in film building speed, and uniform and fine in film layer and has better anticorrosion, adhesive force of each metal part with a coating is enhanced, and the phosphating solution has the characteristics of capability of saving materials and energy, reasonable functions, low cost, convenience in use and capability of meeting the industrialized production requirements of the cars, and the product does not harm human body health and damage ecological environment in and after use.

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 Applications(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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