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Zinc phosphating solution of aluminium and aluminium alloy

A zinc-based phosphating solution and aluminum alloy technology, applied in the direction of metal material coating technology, can solve the problems of chromium environmental pollution, human injury and other problems, and achieve the effects of reducing treatment costs, less slag, and convenient use.

Inactive Publication Date: 2010-08-25
中化化工科学技术研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No toxic chromium is used in the phosphating solution, and no chromium is contained in the phosphating film, which fundamentally solves the problem of environmental pollution and human damage caused by chromium in the coating process of aluminum and aluminum alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Phosphating solution formula: PO 4 3- 10g / l, NO 3 - 7g / l, Zn 2+ 2.0g / l, F - 0.12g / l, Fe 2+ 1.1g / l, Ni 2+ 0.03g / l, organic complexing agent 0.04g / l, accelerator 0.0004g / l, the balance is water. Adjust the free acidity of the solution with sodium hydroxide to be 1.2 points, and now the total acidity is 17.3 points. Treat aluminum and aluminum alloy workpieces at room temperature, soak the line for 10 minutes, spray the line for 3 minutes, take it out and wash it, dry, paint, and cure.

[0089] The results of processing on the immersion line: cross-cut test level 0, neutral salt spray test for 268 hours, and impact resistance test of 50cm.

[0090] The results of treatment on the spray line: cross-cut test level 0, neutral salt spray test for 268 hours, and impact resistance test of 50cm.

Embodiment 2

[0092] Phosphating solution formula: PO 4 3- 18g / l, NO 3 - 16g / l, Zn 2+ 4.0g / l, F - 0.25g / l, Fe 2+ 0.6g / l, Ni 2+ 0.05g / l, organic complexing agent 1.1g / l, accelerator 0.0002g / l, the balance is water. Adjust the free acidity of the solution with sodium hydroxide to 1.0 points, and the total acidity is 23.6 points at this time. Treat aluminum and aluminum alloy workpieces at room temperature, soak the line for 8 minutes, spray the line for 1.5 minutes, take it out and wash it with water, then dry, paint, and cure.

[0093] The results of processing on the immersion line: cross-cut test level 0, neutral salt spray test for 268 hours, and impact resistance test of 50cm.

[0094] The results of treatment on the spray line: cross-cut test level 0, neutral salt spray test for 268 hours, and impact resistance test of 50cm.

Embodiment 3

[0096] Phosphating solution formula: PO 4 3- 13g / l, NO 3 - 10g / l, Zn 2+ 8.0g / l, F - 0.12g / l, Fe 2+ 0.8g / l, Ni 2+ 0.09g / l, organic complexing agent 0.9g / l, accelerator 0.0003g / l, the balance is water. Adjust the free acidity of the solution with sodium hydroxide to be 1.4 points, and the total acidity is now 21.1 points. Treat aluminum and aluminum alloy workpieces at 40°C, soak the line for 12 minutes, spray the line for 2 minutes, take it out and wash it with water, then dry, paint, and cure.

[0097] The results of processing on the immersion line: cross-cut test level 0, neutral salt spray test for 268 hours, and impact resistance test of 50cm.

[0098] The results of treatment on the spray line: cross-cut test level 0, neutral salt spray test for 268 hours, and impact resistance test of 50cm.

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PUM

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Abstract

The invention belongs to the field of metal surface treatment, relating to a zinc phosphating solution of aluminium and aluminium alloy. The invention is mainly used for zinc phosphating treatment of the aluminium and aluminium alloy in the industries of home appliances, automobiles, hardware, building materials and railway locomotives. The zinc phosphating solution is composed of 8-25g / l of PO4<-3>, 6-16g / l of NO3<-1>, 1.6-8.0g / l of Zn<+2>, 0.12-0.38g / l of F<-1>, 0.6-8.0g / l of Fe<+2>, 0.01-1.5g / l of Ni<+2>, 0.0002-0.0006g / l of accelerating agent, 0.001-1.2g / l of organic complexing agent and the balance of water. When the phosphating solution of the invention is used for processing the aluminium and aluminium alloy, the obtained phosphating film has favourable matching capability with the coating, and the griding test of the paint film can reach 0 grade. The phosphating solution of the invention does not use toxic chromium, and the phosphating film does not contain chromium so as to solve the problems of environment pollution and toxic hazard on the human body when the chromium is used for processing the aluminium and aluminium alloy, and lower treatment cost.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a zinc-based phosphating solution for aluminum and aluminum alloys, which is mainly used for zinc-based phosphorus before coating of aluminum and aluminum alloys in the industries of household appliances, automobiles, hardware, building materials and railway locomotives treatment. Background technique [0002] Aluminum and aluminum alloys are widely used because of their unique properties, but their chemical properties are extremely active, unstable, and easy to be corroded. They need good surface treatment to improve and improve their surface properties, improve corrosion resistance, and enhance coating. Layer adhesion, thereby expanding its application field. [0003] Before the present invention, the surface treatment of aluminum and aluminum alloys mainly included processes such as anodic oxidation, chromate conversion, chromate-phosphate conversion and tannate convers...

Claims

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Application Information

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IPC IPC(8): C23C22/36
Inventor 王恩生杨波
Owner 中化化工科学技术研究总院有限公司
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