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Cobalt salt black chemical oxidation solution for aluminum and aluminum alloy and application thereof

A chemical oxidation, aluminum alloy technology, applied in the direction of metal material coating technology, can solve the problems of short service life of blackening solution, high production cost, poor method stability, etc., to achieve improved appearance compactness, good film-forming effect, The effect of a good blackening effect

Inactive Publication Date: 2017-05-31
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of poor method stability, thin film layer, short service life of blackening solution, high production cost and complex and cumbersome operation existing in the existing aluminum and aluminum alloy surface blackening treatment process, the present invention aims to provide a method for aluminum and aluminum alloy surface blackening treatment. Cobalt salt black chemical oxidation solution of aluminum alloy and its application in black chemical oxidation treatment of aluminum and aluminum alloy parts

Method used

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  • Cobalt salt black chemical oxidation solution for aluminum and aluminum alloy and application thereof
  • Cobalt salt black chemical oxidation solution for aluminum and aluminum alloy and application thereof
  • Cobalt salt black chemical oxidation solution for aluminum and aluminum alloy and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0021] Examples 1-4: Blackening solutions containing different cobalt salts (without dispersants and additives) and their blackening experiments.

[0022]

[0023] Select 4 different cobalt salt formulas to carry out parallel experiments, and keep other components and dosages in the formulas exactly the same. Through the following process flow, 4 kinds of black chemical oxidation solutions are compared and analyzed:

[0024] (1) Preprocessing:

[0025] Pickling and alkali cleaning are carried out on the surface of the aluminum sheet to remove the formed oxide film and stains.

[0026] (2) Chemical oxidation:

[0027] A) Preparation of blackening solution: Accurately weigh various solid components according to the dosage in the above table, put them in a beaker and add water to 1L after weighing, stir and dissolve, place in a water bath and heat to 80°C, adjust with nitric acid until the pH of the solution is 1-3.

[0028] B) Oxidation film formation: put the pretreated ...

Embodiment 5-8

[0030] Examples 5-8: Blackening solutions containing different dispersants (without additives) and their blackening experiments.

[0031]

[0032]

[0033] Select 4 different dispersants to conduct parallel experiments, and keep the other components and dosages in the formula exactly the same. Through the following process flow, 4 kinds of black chemical oxidation solutions are compared and analyzed:

[0034] (1) Preprocessing:

[0035] Pickling and alkali cleaning are carried out on the surface of the aluminum sheet to remove the formed oxide film and stains.

[0036] (2) Chemical oxidation:

[0037] A) Preparation of blackening solution: Accurately weigh various solid components according to the dosage in the above table, put them in a beaker and add water to 1L after weighing, stir and dissolve, place in a water bath and heat to 80°C, adjust with nitric acid until the pH of the solution is 1-3.

[0038] B) Oxidation film formation: put the pretreated aluminum shee...

Embodiment 9-12

[0040] Examples 9-12: Blackening solutions containing different additives (without dispersant) and their blackening experiments.

[0041]

[0042] Choose 4 kinds of different additives to carry out parallel experiment, and keep other components and dosage in the formula exactly the same. Through the following process flow, 4 kinds of black chemical oxidation solutions are compared and analyzed:

[0043] (1) Preprocessing:

[0044] Pickling and alkali cleaning are carried out on the surface of the aluminum sheet to remove the formed oxide film and stains.

[0045] (2) Chemical oxidation:

[0046] A) Preparation of blackening solution: Accurately weigh various solid components according to the dosage in the above table, put them in a beaker and add water to 1L after weighing, stir and dissolve, place in a water bath and heat to 80°C, adjust with nitric acid until the pH of the solution is 1-3.

[0047] B) Oxidation film formation: put the pretreated aluminum sheet in the bl...

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Abstract

The invention belongs to the technical field of metal material surface treatment, and relates to a cobalt salt black chemical oxidation solution for aluminum and aluminum alloy and application thereof. Specifically, the cobalt salt black chemical oxidation solution comprises cobalt salt, nickel sulfate, sodium bromated, a dispersing agent, an additive and water, wherein every 1 L of the cobalt salt black chemical oxidation solution contains 10-40 g of cobalt salt, 1-10 g of nickel sulfate, 10-30 g of sodium bromated, 1-10 g of the dispersing agent, 1-20 g of the additive and the balance water. The formula and parameter improvement of the cobalt salt black chemical oxidation solution is carried out so that the blackening solution can be repeatedly used for black chemical oxidation treatment of aluminum and aluminum alloy pieces, the service life of the blackening solution is prolonged, an obtained blackened film has a good blackened effect and a good film-forming effect, and the appearance compactness of the film is also improved.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and relates to a cobalt salt black chemical oxidation solution for aluminum and aluminum alloys and its application in black chemical oxidation treatment of aluminum and aluminum alloy parts. Background technique [0002] With the increasingly wide application range of aluminum alloys, people's requirements for the use of aluminum alloy materials are increasing day by day. Aluminum alloy surface blackening is a technology that uses chemical or electrochemical methods to form a black film on the surface of aluminum alloys, which is used for anti-corrosion, matting and decoration of aluminum alloy parts. After blackening treatment, it not only improves the anti-corrosion performance of aluminum alloy, but also improves its decoration. It also has better sunlight absorption and infrared radiation capabilities, and can be widely used in aerospace, construction, cameras, optic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/56C23C22/42C23C22/40C23C22/08
CPCC23C22/08C23C22/40C23C22/42C23C22/56
Inventor 马迪李树白周熙雯于冬梅侯丹丹王继磊倪萍
Owner JIANGSU UNIV OF TECH
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