A kind of surface treatment method of aluminum products before painting

A technology for surface treatment and aluminum products, applied in the direction of surface pretreatment, device for coating liquid on the surface, coating, etc., can solve limited problems, achieve simple wastewater treatment, good wear resistance, and good wear resistance. Effect

Active Publication Date: 2016-08-17
GUANGZHOU HONWAY TECH CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Anodizing is to improve the bonding force of the coating, but it is limited; the use of chromic acid passivation is also to improve the bonding force of the coating layer. Hexavalent chromium is a harmful and toxic substance and is one of the chemical substances that induce cancer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of cyanide-free zinc dipping solution:

[0039] ① Dissolve zinc sulfate, ferric chloride, sodium hydroxide, potassium pyrophosphate, triethanolamine, EDTA disodium, BOZ, ALS and SP with deionized water to obtain a cylinder opener; wherein the concentration of each component is Zinc ion 40g / L, iron ion 1g / L, sodium hydroxide 150g / L, potassium pyrophosphate 100g / L, triethanolamine 10g / L, disodium EDTA 3g / L, BOZ0.1g / L, ALS1.85g / L , SP0.05g / L.

[0040] ② The tank starter is 300ml / L, and the rest is deionized water to obtain a cyanide-free zinc dipping solution.

[0041] (2) Coating aluminum products with the cyanide-free zinc dipping solution prepared above, the steps are:

[0042] Grinding→Washing→Zincing→Washing→Etching→Washing→Anodizing→Washing→Coating and subsequent processes; the washing steps are all washed with deionized water;

[0043] ① Grinding: Use two 3M nylon roller brushes to grind the workpiece made of aluminum plate. The rotation speed of ...

Embodiment 2

[0049] (1) Preparation of cyanide-free zinc dipping solution:

[0050] ① Dissolve zinc oxide, ferric sulfate, cobalt acetate, sodium hydroxide, HEDP, monoethanolamine, tetraethylenepentamine, DEP, PS and MESS with deionized water to obtain a cylinder opener; the concentration of each component is 20g of zinc ion / L, iron ion 0.05g / L, cobalt ion 1g / L, sodium hydroxide 80g / L, HEDP50g / L, monoethanolamine 20g / L, tetraethylenepentamine 5g / L, DEP1g / L, PS0.2g / L , MESS0.05g / L.

[0051] ② The potting agent is 500ml / L, and the rest is deionized water to obtain a cyanide-free zinc dipping solution.

[0052] (2) Coating aluminum products with the cyanide-free zinc dipping solution prepared above, the steps are:

[0053] Grinding→Washing→Zincing→Washing→Etching→Washing→Anodizing→Washing→Coating and subsequent processes; the washing steps are all washed with deionized water;

[0054] ① Grinding: Use three 3M nylon roller brushes to grind the workpiece made of aluminum plate. The rotation...

Embodiment 3

[0060] (1) Preparation of cyanide-free zinc dipping solution:

[0061] ① Dissolve zinc chloride, nickel acetate, cuprous chloride, ferric nitrate, ATMP, potassium pyrophosphate, nitrilotriacetic acid, diethanolamine, PPS-OH, PA, IZEC and TPS with deionized water to obtain a cylinder opener; The concentration of each component is zinc ion 30g / L, nickel ion 6g / L, copper ion 0.001g / L, iron ion 0.5g / L, potassium hydroxide 160g / L, ATMP50g / L, potassium pyrophosphate 30g / L, Nitrilotriacetic acid 20g / L, diethanolamine 10g / L, PPS-OH0.5g / L, PA0.2g / L, IZEC0.05g / L, TPS0.08g / L;

[0062] ② The potting agent is 400ml / L, and the rest is deionized water to obtain a cyanide-free zinc dipping solution.

[0063] (2) Coating aluminum products with the cyanide-free zinc dipping solution prepared above, the steps are:

[0064] Grinding→Washing→Zincing→Washing→Etching→Washing→Anodizing→Washing→Coating and subsequent processes; the washing steps are all washed with deionized water;

[0065] 1. grin...

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PUM

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Abstract

The invention discloses an aluminum product surface processing method before coating. The processing method includes: grinding an aluminum product, washing, performing one-step zinc immersion with cyanide-free zinc immersion solution, washing, etching, washing, anodizing and washing. The processing method has the advantages that the cyanide-free zinc immersion process is added to a traditional process for the first time, the method is toxic-free, harmless and simple in waste water treatment, the wear resistance of obtained the aluminum product after coating can be increased greatly, experiment wear resistance times can reach more than 90, and device service life is prolonged; in addition, the cyanide-free zinc immersion solution is low in requirements of other steps and wide in application range, and stable wear resistance of the aluminum product, using the cyanide-free zinc immersion solution, after coating is achieved.

Description

technical field [0001] The invention belongs to the technical field of surface treatment before spraying of aluminum and aluminum alloys, and in particular relates to a surface treatment method of aluminum products before painting. Background technique [0002] Due to its low density, good mechanical properties and easy processing and forming, aluminum has been widely used in aviation, home appliances, instrumentation and construction industries. However, the chemical properties of aluminum and aluminum alloys are extremely active, unstable, and easily corroded, so it is necessary to cover the surface with a protective layer or a decorative layer, that is, to carry out painting. The treatment of aluminum and aluminum alloys before coating can effectively solve the problems of bonding force and weather resistance between the coating and the substrate. [0003] The traditional pre-painting process for aluminum and aluminum alloys is generally: grinding→water washing→etching→w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D3/00
Inventor 徐金来赵国鹏胡耀红周杰
Owner GUANGZHOU HONWAY TECH CORP
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