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Environmental phosphating solution

A kind of phosphating liquid, environmental protection technology, applied in the direction of metal material coating process, etc., can solve the problems of short service life of phosphating liquid, environmental treatment burden, high phosphating temperature, low cost, uniform and fine film layer, enhanced The effect of adhesion

Inactive Publication Date: 2015-10-07
DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Effect test

Embodiment 1

[0021] Calculate the amount of each component according to the volumetric amount of the phosphating solution as needed. In terms of 1000L phosphating solution, water is added to 40% of the volume of the phosphating tank, and the mass concentration is 6.1kg of phosphoric acid with a mass concentration of 85%. Add 8kg of 75% nitric acid, 0.7kg of ethylenediaminetetraacetic acid, 1.1kg of citric acid, 0.8kg of tartaric acid and 0.75kg of phytic acid in sequence, and stir evenly, then add 20.3kg of zinc dihydrogen phosphate, 10.6 kg of manganese dihydrogen phosphate kg, 8.8 kg of calcium dihydrogen phosphate, and 7 kg of zinc nitrate, after stirring and dissolving, add 0.1 kg of polyaluminum chloride, 0.5 kg of polyacrylamide and 4 kg of polyhydroxy carboxylic acid compound, the composition of polyhydroxy carboxylic acid compound is HEDP 20wt% , polyacrylic acid 4wt%, water 76wt%, finally add water to make up the volume to the specified volume, stir evenly, adjust the pH range of t...

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 40% of the volume of the phosphating tank, add 15kg of nitric acid with a mass concentration of 75%, and a mass concentration of 85% 17kg of phosphoric acid, 1.2kg of ethylenediaminetetraacetic acid, 3.6kg of citric acid, 3.0kg of tartaric acid and 1.0kg of phytic acid were added in sequence, and stirred evenly, then 4.72kg of calcium nitrate, 5.12kg of manganese nitrate, dihydrogen phosphate Zinc 7.5kg, zinc phosphate 17kg, manganese dihydrogen phosphate 3.96kg and calcium phosphate 0.51kg, after stirring and dissolving, add polyaluminum chloride 0.1kg, polyacrylamide 0.5kg and polyhydroxy carboxylic acid compound 4kg, polyhydroxy carboxylic acid The composition of the compound is 22wt% of HEDP, 4wt% of polyacrylic acid, and 74wt% of water. Finally, add water to make up the volume to the specified volume, stir ev...

Embodiment 3

[0025] 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 40% of the volume of the phosphating tank, and add 7kg of nitric acid with a mass concentration of 75% and a mass concentration of 85%. 7kg of phosphoric acid, 1.0kg of ethylenediaminetetraacetic acid, 0.6kg of citric acid, 2.5kg of tartaric acid and 0.5kg of phytic acid were added in turn, and stirred evenly, then 30kg of zinc nitrate, 20.5kg of calcium dihydrogen phosphate, diphosphate Hydrogen zinc 6.8kg and manganese dihydrogen phosphate 20.25kg, after stirring and dissolving, add polyaluminum chloride 0.2kg, polyacrylamide 1.0kg and polyhydroxy carboxylic acid compound 5kg successively, the composition of polyhydroxy carboxylic acid compound is HEDP 25wt%, 4wt% polyacrylic acid, 73wt% water, finally add water to make up the volume, stir evenly, and adjust the pH range of the phosphating solution to be 3.5-5.5...

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Abstract

The invention provides an environmental phosphating solution, which belongs to the field of industrial phosphating solutions. The phosphating solution comprises Zn<2+>, Mn<2+>, Ca<2+>, nitrate, phosphate, edetic acid, citric acid, tartaric acid, phytic acid, polyhydroxy carboxylic acid compound, aluminium polychlorid and polyacrylamide. The phosphating solution prepared by adopting a method provided by the invention has the advantages of good stability, simplicity in technical operation, low difficulty of control technology, high film forming speed, uniformity and fineness of films, good corrosion resistance, wide application range, low cost and convenience in use and is favorable for industrial production, and the adhesive force of metal components and coatings is increased.

Description

technical field [0001] The invention belongs to the field of industrial phosphating solutions, in particular to an environment-friendly phosphating solution. Background technique [0002] Phosphating refers to the process in which metal parts undergo chemical reactions, electrochemical reactions, etc. in phosphate solutions to form an insoluble phosphating film on the metal surface. 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 ...

Claims

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Application Information

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IPC IPC(8): C23C22/07
Inventor 邓金玲
Owner DALIAN BETRUST ENVIRONMENTAL PROTECTION TECH CO LTD
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