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Aluminum alloy spraying pretreatment chrome-free passivation line cleaning water reverse series water-saving configuration

A chromium-free passivation and reverse series technology, which is applied in the coating process of metal materials, etc., can solve the problems of rare earth inorganic salt toxicity, environmental impact, volatilization pollution, etc.

Active Publication Date: 2021-04-23
熊映明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although the rare earth chromium-free passivation technology has made some progress, it has not been able to effectively solve the problems such as the toxicity of rare earth inorganic salts and its impact on the environment.
However, the applicant believes that, compared with the inorganic salt composite conversion film, although the organic passivation film is a directional technology for surface pretreatment in the future, there are still many factors such as cost, solvent volatilization pollution, etc. Constraints, a long way to go

Method used

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  • Aluminum alloy spraying pretreatment chrome-free passivation line cleaning water reverse series water-saving configuration
  • Aluminum alloy spraying pretreatment chrome-free passivation line cleaning water reverse series water-saving configuration
  • Aluminum alloy spraying pretreatment chrome-free passivation line cleaning water reverse series water-saving configuration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0185] The 2# flowing washing tank, the 3# flowing washing tank, the 5# flowing washing tank and the 6# flowing washing tank are washed with tap water for 60 seconds and dripped for 30 seconds for production.

[0186] The aluminum alloy spraying pretreatment chrome-free passivation line cleaning water of the present invention is configured in reverse series to save water, including 1# degreasing tank, 2# flowing water washing tank, 3# flowing water washing tank, 4# chrome-free passivation tank, 5# Flowing washing tank and 6# flowing washing tank, the aluminum alloy passes through 1# degreasing tank, 2# flowing washing tank, 3# flowing washing tank, 4# chrome-free passivation tank, 5# flowing washing tank and 6# flowing washing tank ; 2# flowing washing tank, 3# flowing washing tank, 5# flowing washing tank and 6# flowing washing tank are reversely connected in series. The 1# degreasing tank contains a degreasing agent, and the 4# chromium-free passivation tank contains a chrom...

Embodiment 2

[0193] The passivation line of the aluminum alloy spraying pretreatment chromium-free passivation line of this embodiment is the same as that of embodiment 1, the difference is that the PBTCA concentration of the 4# chromium-free passivation tank is increased to 4.5g / L, 4# flowing water washing tank, 5# flowing water washing tank, 6# flowing water washing tank are clearer, and the national standard inspection of spraying materials is qualified; reduce the PBTCA concentration of 4# chromium-free passivation tank to 2.0g / L, and the national standard inspection of spraying materials is qualified , 4# chromium-free passivation tank is clear, 5# flowing water washing tank, 6# flowing water washing tank is slightly turbid, and a small amount of fluoride is decomposed and released. It can not only meet the requirements of the national standard, reduce the cost, but also block the precipitation of fluoride in the 4# chrome-free passivation tank, 5# flowing water washing tank and 6# fl...

Embodiment 3

[0196] The passivation line of the aluminum alloy spraying pretreatment chromium-free passivation line of this embodiment is the same as that of embodiment 1, the difference is that the passivation time of 4# chromium-free passivation tank is increased to 240 seconds, the national standard test is qualified; reduce the passivation time of 4# chromium-free passivation tank to 20 seconds, and the national standard test occasionally fails; the passivation time can be shortened appropriately at room temperature, but not less than 30 seconds; the passivation time can be extended appropriately at low temperature time, but do not exceed 240 seconds.

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Abstract

The invention discloses an aluminum alloy powder spraying pretreatment chromium-free passivation line cleaning water reverse series water-saving configuration, 6# tank, 5# tank, 3# tank, 2# tank are reversely connected in series; the cleaning water passes through the 6# tank→ 5# tank → 3# tank → 2# tank flows reversely in series; 1# degreasing tank contains degreasing agent, and the chemical components of degreasing agent include: fluorotitanic acid, fluorozirconic acid and phosphonobutane tricarboxylic acid ; 4# chromium-free passivation tank contains chromium-free passivation agent, the chemical components of chromium-free passivation agent include: fluorotitanic acid, fluorozirconic acid and phosphonobutane tricarboxylic acid. The present invention uses the unique design of 1# degreasing tank to be compatible with 4# chromium-free passivation tank reagents and the chemical properties of PBTCA with super strong chelating ability to chelate all metal cations and keep 1#‑6# tank from being turbid and non-toxic. Precipitation, connect two sets of cleaning water in reverse series, reduce cleaning water by half, greatly reduce the amount of fluorine-containing wastewater, abandon traditional pure water cleaning, and greatly reduce production and environmental protection costs.

Description

technical field [0001] The invention relates to the technical field of chromium-free passivation pretreatment of aluminum alloy spraying, in particular to a reverse series water-saving configuration of cleaning water for a chromium-free passivation line of aluminum alloy spraying pretreatment. Background technique [0002] For a long time, people have realized that the chromium-containing passivation technology has serious chromium pollution in the whole process of aluminum profile production, use and disposal. It is the goal of the aluminum profile manufacturing industry to achieve chromium-free passivation treatment on the surface of aluminum profiles. In order to meet the needs of the industry for chromium-free passivation technology, researchers have carried out a lot of research work. In the past 30 years of research on the technology of chromium-free passivation on the surface of aluminum and its alloys, a variety of aluminum and aluminum alloys have been produced. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/73
CPCC23C22/34C23C22/73
Inventor 熊映明
Owner 熊映明