Low-temperature zinc-based phosphatization liquid

A zinc-based phosphating solution and low-temperature technology, which is applied in the coating process of metal materials, can solve the problems of not being able to keep up with the production rhythm, long phosphating time, and low operating temperature, and achieve a wide range of process parameters and increase the paint film Adhesion, effect of low working temperature

Inactive Publication Date: 2008-12-17
CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the phosphating solution used in production is either used at too high temperature and high energy consumption; or at low temperature, the phosphating time is long, cannot keep up with the production rhythm, and the efficiency is low. A new energy-saving and high-efficiency phosphating solution has been developed for this situation. liquid

Method used

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Comparison scheme
Effect test

Embodiment Construction

[0017] The phosphating solution of the present embodiment is prepared by the raw materials of the following concentrations:

[0018] Zinc oxide 100g / L

[0019] 80% phosphoric acid 230g / L

[0020] 30% nitric acid 280g / L

[0021] Nickel Sulfate (NiSO 4 ·6H 2 O) 2.67g / L

[0022] Carbonic acid 0.2g / L

[0023] EDTA 0.66g / L

[0024] Citric acid 5.0g / L

[0025] Sodium perborate 1.0g / L

[0026] Sodium carbonate 2.3g / L.

[0027] In production, prepare the above-mentioned phosphating solution stock solution and water in a ratio of 1:15, pour water into the phosphating tank to 3 / 4 of the effective volume of the phosphating tank, weigh the required amount of the phosphating solution and pour it into the phosphating tank. Fully stir in the tank to make a working solution, adjust the process range of the working solution to total acidity: 25-35 points, free acidity: 0.8-1.2 points, accelerator: 2-4 points, pH: 2-4.

[0028] Performance test:

[0029] Test piece specifications: co...

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Abstract

This invention involves a cryogenic phosphorization liquid of zinc, belonging to the field of phosphorization liquid for steel surface treatment. The phosphorization liquid of zinc of the invention is composed by the following composition as the raw materials, zinc oxide 100g / L, 80%phosphoric acid 230g / L,30% nitric acid 280g / L, nickel sulfate 2.67g / L, manganese carbonate 0.2g / L, ethylene dinitrilotetraacetic acid 0.66g / L, citric acid 5.0g / L, sodium perborate 1.0g / L, sodium carbonate 2.3g / L. The phosphorization liquid of zinc of the invention is characterized in low temperature; short time, low energy consumption, and can form an excellent dense phosphorization crystal film in the steel surface. The phosphorization liquid has broad process parameters range, is easy to adjust and improves the quality of coating products.

Description

(1) Technical field [0001] The invention relates to a low-temperature zinc-based phosphating solution, which belongs to the technical field of phosphating solutions for steel surface treatment. (2) Background technology [0002] Phosphating treatment before painting is to improve the adhesion and corrosion resistance of the coating film. At present, the phosphating solution used in production is either used at too high temperature and high energy consumption; or at low temperature, the phosphating time is long, cannot keep up with the production rhythm, and the efficiency is low. A new energy-saving and high-efficiency phosphating solution has been developed for this situation. liquid. (3) Contents of the invention [0003] In order to overcome the shortcomings of the above technologies, the present invention provides a low-temperature zinc-based phosphating solution, which can form a phosphating film layer with good adhesion and excellent corrosion resistance on the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/07
Inventor 李永俊牟淑荣王素花张永军张新美
Owner CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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