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Treatment method of electrolytic coloring of black color of aluminium alloy anodic oxidation film

A technology of anodized film and treatment method, applied in the direction of electrolytic paint, surface reaction electrolytic coating, coating, etc., can solve the problems of black film black impure, gray, brown and other problems

Active Publication Date: 2012-04-25
东莞睿泳五金制品有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the narrow voltage range of electrolytic blackening of traditional aluminum alloy after anodic oxidation, and the black film obtained by coloring often has the disadvantages of impure black, graying or browning , providing a treatment method for electrolytic blackening of aluminum alloy anodized film, which effectively solves the above problems

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  • Treatment method of electrolytic coloring of black color of aluminium alloy anodic oxidation film

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experiment example 1

[0027] A processing method for electrolytic blackening of anodized film of aluminum alloy. First, the aluminum alloy is pre-treated: the surface is deoxidized and then washed with water, and a mixed solution of sodium hydroxide (30g / L) and sodium carbonate (25g / L) is used for alkali treatment. After 1min, take out and wash with water, immerse in sodium hydroxide (50g / L) solution for alkaline etching, take out and wash after 1min, and immerse in nitric acid solution (200mL / L) to neutralize residual alkali and emit light, take out after 1min Washed and dried. After pretreatment, the aluminum alloy sample was used as the anode, the graphite electrode was used as the cathode, and the ratio of cathode to anode was 1:1. 3+ The anodic oxidation solution of 170g / L sulfuric acid was anodized for 40min, and the oxidation voltage was DC 15V. The anodized aluminum alloy is used as the cathode, the aluminum electrode is used as the anode, and the ratio of the cathode to the anode is 1:1. ...

experiment example 2

[0031] A processing method for electrolytic blackening of anodized film of aluminum alloy. First, the aluminum alloy is pre-treated: the surface is deoxidized and then washed with water, and a mixed solution of sodium hydroxide (30g / L) and sodium carbonate (25g / L) is used for alkali treatment. After 1min, take out and wash with water, immerse in sodium hydroxide (50g / L) solution for alkaline etching, take out and wash after 1min, and immerse in nitric acid solution (200mL / L) to neutralize residual alkali and emit light, take out after 1min Washed and dried. After pretreatment, the aluminum alloy sample was used as the anode, the graphite electrode was used as the cathode, and the ratio of cathode to anode was 1:1. 3+ The anodic oxidation solution of 170g / L sulfuric acid was anodized for 40min, and the oxidation voltage was DC 15V. The anodized aluminum alloy is used as the cathode, the aluminum electrode is used as the anode, and the ratio of the cathode to the anode is 1:1. ...

experiment example 3

[0035]A processing method for electrolytic blackening of anodized film of aluminum alloy. First, the aluminum alloy is pre-treated: the surface is deoxidized and then washed with water, and a mixed solution of sodium hydroxide (30g / L) and sodium carbonate (25g / L) is used for alkali treatment. After 1min, take out and wash with water, immerse in sodium hydroxide (50g / L) solution for alkaline etching, take out and wash after 1min, and immerse in nitric acid solution (200mL / L) to neutralize residual alkali and emit light, take out after 1min Washed and dried. After pretreatment, the aluminum alloy sample was used as the anode, the graphite electrode was used as the cathode, and the ratio of cathode to anode was 1:1. 3+ The anodic oxidation solution of 170g / L sulfuric acid was anodized for 40min, and the oxidation voltage was DC 15V. The anodized aluminum alloy is used as the cathode, the aluminum electrode is used as the anode, and the ratio of the cathode to the anode is 1:1. A...

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Abstract

The invention discloses a treatment method of electrolytic coloring of a black color of an aluminium alloy anodic oxidation film, and belongs to the technical field of surface treatment. The method comprises pretreatment, anodic oxidation, AC electrolytic coloring, and sealing; the electrolytic coloring liquid comprises 10-15 g / L of SnSO4, 13-17 g / L of H2SO4, 10-20 g / L of NiSO4, 25-8 g / L of NiCl, 1-2 g / L of tartaric acid, and 0.1-0.2 g / L of cerium sulfate; the coloring technological parameters for the AC electrolytic coloring of a black color are that: the AC voltage is 10-14 V; the coloring liquid temperature is 16-24 DEG C; and the coloring time is 16-22 min. The film with an electrolytic colored black color after anodic oxidation obtained by the method has a pure and uniform color, and is fine and glossy; the fine and glossy black film obtained during electrolytic coloring has a voltage range which is widened nearly twice, and the corrosion resistance to 3.5% sodium chloride of the black film is improved by 30%.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and mainly relates to a treatment method for electrolytic blackening of aluminum alloy anodic oxidation film, and relates to an improvement of the electrolytic blackening process of aluminum alloy anodic oxidation film. Background technique [0002] The electrolytic coloring technology of aluminum and its alloys originated in Europe in the 1940s, and is an important way of aluminum surface protection and decorative treatment. In the aluminum alloy coloring treatment technology, the true black film layer occupies an important position, and has gradually become a popular trend in the European and American markets in recent years. A lot of practice has proved that the corrosion resistance, weather resistance, optical rotation resistance and service life of the electrolytic coloring film on the aluminum alloy surface are much better than the dyed film, but the chroma, uniformity and weather...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/22
Inventor 于锦何滨刘洋
Owner 东莞睿泳五金制品有限公司
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