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A kind of method of electroless plating iron on the surface of aluminum alloy

An aluminum alloy surface, chemical immersion plating technology, applied in liquid chemical plating, metal material coating technology, coating and other directions, can solve the problem of lack of mature aluminum alloy immersion iron plating technology, achieve low cost and improve electrode potential , the effect of improving quality

Active Publication Date: 2021-06-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the electrode potential tables of various metals, it can be seen that the electrode potential of Fe is relatively high, which can be used as a suitable pre-plating layer, but there is no mature aluminum alloy immersion iron plating process.

Method used

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  • A kind of method of electroless plating iron on the surface of aluminum alloy
  • A kind of method of electroless plating iron on the surface of aluminum alloy
  • A kind of method of electroless plating iron on the surface of aluminum alloy

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Embodiment 1

[0026] A method for chemically dipping iron on the surface of an aluminum alloy, comprising the following steps:

[0027] (1) Surface pretreatment of aluminum alloy material: grind the surface of aluminum alloy material with sandpaper, then place the aluminum alloy material in acetone and absolute ethanol for 5-10min ultrasonic cleaning, and dry it to obtain the pretreated aluminum alloy material ;

[0028] (2) Alkali corrosion and activation of aluminum alloy surface: immerse the pretreated aluminum alloy material in an alkaline solution to remove oxide films and inclusions, and the alkaline solution is composed of 50g / L sodium hydroxide and 2g / L dodecyl Sodium benzenesulfonate is mixed, and the alkali etching process is as follows: the solution temperature is 50°C, and the alkali etching time is 30s;

[0029] The aluminum alloy material after alkali etching is immersed in acid solution to remove the black corrosion produced in the alkali etching process. The acid solution i...

Embodiment 2

[0039] The chemical immersion iron solution in this implementation case includes 45g / L ferric salt, 10g / L film remover and 8.5g / L accelerator, wherein iron salt is ferrous chloride, film remover is hydrofluoric acid, and accelerator consists of 8g / L thiourea and 0.5g / L ammonium fluoride.

[0040] The chemical leaching iron solution preparation steps are:

[0041] (1) Dissolve the thiourea and ammonium fluoride of the above concentration with 500mL of deionized water, and fully stir until completely dissolved;

[0042] (2) Add the hydrofluoric acid of specified concentration in the above-mentioned solution, and fully stir;

[0043] (3) Use 200ml of deionized water to dissolve 45g of ferrous sulfide, stir until clarified, add the mixed solution prepared in (1)(2) step, stir evenly, and then use deionized water to set the volume to 1L to obtain the obtained The chemical immersion iron solution described above.

[0044] The working temperature during immersion plating is 50°C, ...

Embodiment 3

[0049] The chemical immersion iron solution in this implementation case includes 50g / L iron salt, 15g / L film removal agent and 6g / L accelerator, wherein the iron salt is ferrous chloride, and film removal agent consists of 14g / L hydrofluoric acid and 1g / L boric acid, the accelerator consists of 5g / L thiourea and 1g / L ammonium fluoride.

[0050] The chemical leaching iron solution preparation steps are:

[0051] (1) Dissolve the thiourea and ammonium fluoride of the above concentration with 500mL of deionized water, and fully stir until completely dissolved;

[0052] (2) Add hydrofluoric acid and boric acid of specified concentration in above-mentioned solution, and fully stir;

[0053] (3) Use 200ml of deionized water to dissolve 50g of ferrous chloride, stir until clarified, add the mixed solution prepared in step (1)(2), stir evenly, and then use deionized water to make up to 1L. The chemical immersion iron solution.

[0054] The working temperature during immersion platin...

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Abstract

The invention discloses a method for chemically immersing iron on the surface of an aluminum alloy, comprising the following steps: grinding and pretreating the surface of an aluminum alloy material; immersing the pretreated aluminum alloy material in an alkali solution to remove oxide films and inclusions; The etched aluminum alloy material is immersed in an acid solution to remove the black corrosion produced during the alkali etching process, and the aluminum alloy is immersed in an electroless iron plating solution to deposit an iron layer. agent. The invention can deposit an iron layer with a thickness of 2-15 μm on the surface of the aluminum alloy in a relatively short period of time through the chemical immersion plating method, and the coating layer is dense and smooth, and at the same time, the oxide film on the surface of the aluminum alloy is effectively removed after treatment, and The electrode potential on the surface is greatly improved, which can effectively improve the quality of the plating layer in the subsequent electroplating process. At the same time, the process is simple, can handle aluminum alloy parts with complex shapes, has low cost, high production efficiency, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the field of aluminum alloy surface treatment, and in particular relates to a solution formula and method for preparing an iron-plated layer on the aluminum alloy surface. Background technique [0002] Due to their high specific strength, excellent ductility, and good electrical conductivity, aluminum and aluminum alloys are widely used in many industrial sectors such as power electronics, aviation, chemical industry, construction, and transportation, as well as in daily life. The second largest category of metal materials. However, the low surface hardness and poor wear resistance of aluminum and aluminum alloys limit their further applications. At present, a variety of surface treatment technologies have been developed to improve the surface wear resistance of aluminum alloys, such as ion nitriding, ion implantation, physical vapor deposition, micro-arc oxidation, and laser surface treatment. These methods can effectively i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/54C25D5/44
CPCC23C18/54C25D5/44
Inventor 孙建朱香存梅良玉李毅雷艺苑吴玉程
Owner HEFEI UNIV OF TECH