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Low chromium anticorrosive chemical conversion treating fluid on surface of constructive aluminium profile and use method thereof

A chemical conversion treatment and conversion treatment technology, applied in the field of chemical conversion film treatment on the surface of aluminum alloys, can solve the problems of high waste water treatment cost, poor stability of chromating solution, easy ash on the surface of workpieces, etc. Bright and beautiful effect

Inactive Publication Date: 2009-12-09
佛山科富科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, China has begun to study chromate conversion treatment technology, and has successively developed some chromate conversion treatment solutions, but at present, potassium ferricyanide is generally used as an accelerator, and ferricyanide will be catalyzed by ultraviolet light and decomposed into toxic cyanide. At the same time, there are high chromate content, high waste water treatment cost, poor stability of chromizing solution, easy to become turbid solution, more sediment, easy to hang dust on the surface of workpiece, poor corrosion resistance of chromizing film, anti-salt spray 168h lower than the national standard, the film layer is rough, loose, poor adhesion and other defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Put the architectural aluminum profiles after acid-etching and degreasing treatment in chromate containing 1.0 g / L, fluorine compound 0.5 g / L, zinc salt 0.4 g / L, nitrate 0.8 g / L, rare earth metal salt 0.2 g / L , Stabilizer 0.3 g / L, PH value 1.8-2.2, temperature 5-40 ℃ bath treatment, treatment time 3-5 minutes (dipping) or 0.5-1.5 minutes (spraying), can be in the building aluminum profile A dense and uniform layer is formed on the surface, and the film weight per unit area is 0.2-1.3g / m 2 , Golden yellow to iridescent chromate conversion coating with a film thickness of 1-2 μm, the salt spray test exceeds the national standard of 168 hours, strong corrosion resistance, good bonding with organic coatings, adhesion, impact strength, cupping Various performance indicators such as tests have reached the national standard.

Embodiment 2

[0037] Put the architectural aluminum profiles after acid-etching and degreasing treatment in 2.0 g / L chromate, 0.3 g / L fluorine compound, 0.1 g / L zinc salt, 0.4 g / L nitrate, and 0.5 g / L rare earth metal salt. , Stabilizer 0.8 g / L, PH value 1.8-2.2, temperature 5-40 ℃ bath treatment, treatment time 3-5 minutes (dipping) or 0.5-1.5 minutes (spraying), it can be used in building aluminum profiles A dense and uniform layer is formed on the surface, and the film weight per unit area is 0.2-1.3g / m 2 , Golden yellow to iridescent chromate conversion coating with a film thickness of 1-2 μm, the salt spray test exceeds the national standard of 168 hours, strong corrosion resistance, good bonding with organic coatings, adhesion, impact strength, cupping Various performance indicators such as tests have reached the national standard.

Embodiment 3

[0039] Put the architectural aluminum profiles after acid-etching and degreasing treatment in 0.6 g / L chromate, 0.9 g / L fluorine compound, 0.3 g / L zinc salt, 0.2 g / L nitrate, and 0.3 g / L rare earth metal salt. , Stabilizer 0.5 g / L, PH value 1.8-2.2, temperature 5-40 ℃ bath treatment, treatment time 3-5 minutes (dipping) or 0.5-1.5 minutes (spraying), it can be used in building aluminum profiles A dense and uniform layer is formed on the surface, and the film weight per unit area is 0.2-1.3g / m 2 , Golden yellow to iridescent chromate conversion coating with a film thickness of 1-2 μm, the salt spray test exceeds the national standard of 168 hours, strong corrosion resistance, good bonding with organic coatings, adhesion, impact strength, cupping Various performance indicators such as tests have reached the national standard.

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Abstract

The invention discloses a low chromium anticorrosive chemical conversion treating fluid on the surface of constructive aluminium profile and a use method thereof; the technology comprises placing constructive aluminium profile in a tank liquor to treat with a pH value of 1.8-2.2 at 5-40 DEG C for 3-5min or 0.5-1.5min to form a layer of compact and uniform golden to irisated chromate conversion film with a film thickness of 1-2mu m on the surface of the constructive aluminium profile; wherein, the tank liquor comprises 0.6-2.0g / L of chromate, 0.3-0.9g / L of fluorine compound, 0.1-0.6g / L of zinc salt, 0.2-0.8g / L of nitrate, 0.1-0.5g / L of salts from rare earth metals and 0.3-1.0g / L of stabilizer. The invention has simple process and contains no potassium ferricyanide and low chromate; the solution is stable with little sediment; the service cycle is long; the cost of environment pollution and wastewater treatment is low; the treated waste solution can meet the relative discharge standards and the invention has other advantages of room temperature use, energy saving, low comprehensive cost and the like.

Description

Technical field: [0001] The invention relates to the technical field of chemical conversion film treatment on the surface of aluminum alloys, in particular to a low-chromium anti-corrosion chemical conversion treatment liquid on the surface of building aluminum profiles and a method for using the same. Background technique: [0002] Aluminum alloy profiles for construction require high comprehensive performance such as corrosion resistance, weather resistance, wear resistance, good appearance decoration and long service life. Therefore, aluminum profiles are protected by electrostatic powder spraying and fluorocarbon resin paint coating. Before decoration, surface chemical conversion treatment must be carried out to improve the bonding force between the coating and the substrate and meet the high corrosion resistance requirements. At present, chromate conversion treatment is basically used in my country. Some countries in Europe and the United States have introduced chromate-...

Claims

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Application Information

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IPC IPC(8): C23C22/37C23C22/38
Inventor 袁兴蒙文坚王运玖
Owner 佛山科富科技有限公司
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