Low-temperature slag-free zinc bonderite as well as preparation method and applications thereof

A phosphating agent and zinc-based technology, which is applied in the coating process of metal materials, etc., can solve the problems of high energy consumption, waste of resources, and high labor intensity, and achieve low energy consumption, lower unit cost, and fine phosphating film Effect

Inactive Publication Date: 2011-07-13
张华斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings and deficiencies of existing zinc-based phosphating agents such as sediment, high energy consumption, high labor intensity, and waste of resources, the inventor first provided a low-temperature slag-free zinc-based phosphatin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1

[0049] Material preparation:

[0050] Based on the preparation of 1000kg of low-temperature slag-free zinc phosphating agent, 285kg of nitric acid, 105kg of phosphoric acid, 96kg of zinc oxide, 16kg of soda ash, 2.2kg of citric acid, 1.2kg of sodium fluoride, 1.0kg of sodium nitrite and 50kg of complexing agent, the balance For water.

[0051] The 50kg complexing agent contains 5kg of EDTA, 1.5kg of citric acid, 3kg of tartaric acid, 0.5kg of sodium tungstate, and the balance is water.

[0052] The preparation process is as follows:

[0053] Firstly, zinc oxide, soda ash, citric acid, sodium fluoride, and sodium nitrite are respectively adjusted into pastes with water, and then nitric acid, phosphoric acid, zinc oxide paste, soda ash paste, citric acid paste, fluorine The sodium sulfide paste, sodium nitrite paste and complexing agent are put into the reaction kettle, and the reaction is completed after 2 hours, and then water is added to 1000 parts to obtain a low-...

Example Embodiment

[0055] Example 2

[0056] Material preparation:

[0057] Based on the preparation of 1000kg of low-temperature slag-free zinc phosphating agent, 280kg of nitric acid, 100kg of phosphoric acid, 93kg of zinc oxide, 15kg of soda ash, 2.0kg of citric acid, 1.0kg of sodium fluoride, 1.0kg of sodium nitrite and 48kg of complexing agent, the remainder For water.

[0058] The 48kg complexing agent contains 4.5kg of EDTA, 0.8kg of citric acid, 3.5kg of tartaric acid, 0.7kg of sodium tungstate, and the balance is water.

[0059] The preparation process is as follows:

[0060] Firstly, zinc oxide, soda ash, citric acid, sodium fluoride, and sodium nitrite are respectively adjusted into pastes with water, and then nitric acid, phosphoric acid, zinc oxide paste, soda ash paste, citric acid paste, fluorine The sodium sulfide paste, sodium nitrite paste and complexing agent are put into the reaction kettle, and the reaction is completed after 2 hours, and then water is added to 1000 parts to obtain ...

Example

[0105] Application Comparative Example 1

[0106] Prepare 1000kg working solution: put 667kg of water in the phosphating tank, then add 50kg of phosphating agent mother liquor prepared in Comparative Example 1, stir well and add water to 1000kg, then add 3kg of 20% sodium nitrite solution of accelerator, and stir well. After testing, the prepared working fluid has a total acidity of 18 points, a free acidity of 1.2 points, a promotion point of 1.0, and a pH of 2.6.

[0107] Phosphating treatment: Put the test piece (specification as in Application Example 1) into the above working solution and treat it at 25°C for 10 minutes. More sludge is produced in the phosphating treatment, which has an impact on the continuous phosphating treatment. Workers need to salvage the sludge three times a day, and the newly prepared working fluid needs to be replaced after one day, otherwise the phosphating treatment cannot be carried out.

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PUM

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Abstract

The invention belongs to the field of metal surface processing, and discloses a low-temperature slag-free zinc bonderite comprising the following components in parts by weight: 280-285 parts of bonderite, 100-105 parts of phosphoric acid, 93-96 parts of zinc oxide, 15-16 parts of sodium carbonate, 2.0-2.2 parts of citric acid, 1.0-1.2 parts of sodium fluoride, 1.0 part of sodium nitrite, 48-50 parts of complexing agent, and the balance of water, wherein, the total components by weight are 1000 parts, the complexing agent is an aqueous solution composed of ethylene diamine tetraacetic acid (EDTA), citric acid, tartaric acid and sodium tungstate. By utilizing the bonderite provided by the invention, the prejudice that a large amount of dregs must exist in the zinc bonderite considered by the traditional view is overcome, and nearly no slag exists in phosphating, the phosphating time is short, and the temperature is low. The preparation method is simple, and is easily operated and controlled.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a low-temperature slag-free zinc-based phosphating agent. Background technique [0002] As an anti-corrosion and decorative treatment for metal surfaces, phosphating is more and more widely used in today's increasingly industrialized world. For example, it plays an irreplaceable role in various industries such as furniture, home appliances, automobiles, ships, machinery, weapons, and aerospace. [0003] The progress of society and the development of industry have accelerated the pollution of the environment, which has brought unprecedented pressure on our green homeland. Phosphating, as a traditional essential pretreatment technology, has also been greatly challenged. Because the phosphating agent will continuously produce a large amount of sediment during the process of treating the metal surface. At the same time, the phosphating agent is easy to age, a...

Claims

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Application Information

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IPC IPC(8): C23C22/42
Inventor 张华斌
Owner 张华斌
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