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Aluminum alloy electroplating method

A technology of aluminum alloy and alkali metal, which is applied in the field of aluminum alloy electroplating, can solve problems such as uneven appearance and poor bonding force of the coating, and achieve the effects of avoiding excessive corrosion, enhancing the bonding force of the coating, and ensuring a smooth appearance

Inactive Publication Date: 2010-01-06
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of poor adhesion and uneven appearance of the coating caused by aluminum alloys, especially cast aluminum alloy electroplating methods in the prior art, and to provide an aluminum alloy electroplating method with good adhesion and smooth appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment is used to illustrate the aluminum alloy electroplating method provided by the present invention.

[0034] (1) Pretreatment

[0035] (1) Mechanical polishing: Use a polishing machine to perform mechanical polishing (2500 rpm) on the aluminum alloy to be plated with the brand name AC8A and a size of 50 mm × 35 mm × 3 mm (2500 rpm), and remove surface scratches.

[0036] (2) Dewaxing and degreasing: adopt the aqueous solution of 5% by weight of aluminum alloy dewaxing water (Banglin Chemical Company, DHQ-929), at 60 DEG C, ultrasonically treat the aluminum alloy parts to be plated obtained in step (1) for 3 minutes .

[0037] (3) Alkaline etching: completely immerse the aluminum alloy piece to be plated obtained in step (2) in an etching solution containing 30 g / L of sodium hydroxide, 10 g / L of sodium fluoride, and 100 g / L of glucose. Soak at 25°C for 30 seconds, then wash with deionized water until no hydroxide ions are detected.

[0038] (4) Acid film...

Embodiment 2

[0048] This embodiment is used to illustrate the aluminum alloy electroplating method provided by the present invention.

[0049] According to the method of Example 1, the ZL303 aluminum alloy to be plated (size is 50 mm * 35 mm * 3 mm) is electroplated, the difference is that step (3) is: the aluminum alloy to be plated that is obtained in step (2) Completely immerse in an etching solution containing 30 g / L sodium hydroxide, 10 g / L sodium fluoride, and 3 g / L agar, soak for 30 seconds at 25°C, and then wash with deionized water until there is no hydroxide ion Detected; step (4) is: the aluminum alloy piece to be plated that step (3) obtains is put into containing concentrated nitric acid 6 mol / liter, in the film removing liquid of trihydroxybenzoic acid 10 g / liter, at 25 ℃ Soak for 20 seconds, then wash with deionized water until no nitrate ions are detected. The obtained aluminum alloy plated piece is denoted as A2.

Embodiment 3

[0051] This embodiment is used to illustrate the aluminum alloy electroplating method provided by the present invention.

[0052] According to the method of Example 1, the AC8A aluminum alloy to be plated (size is 50 mm * 35 mm * 3 mm) is electroplated, the difference is that step (3) is: the aluminum alloy to be plated that is obtained in step (2) Completely immerse in an etching solution containing 30 g / L sodium hydroxide, 10 g / L sodium fluoride, and 15 g / L phenol, soak for 30 seconds at 25°C, and then wash with deionized water until there is no hydroxide ion detected; step (4) is: put the aluminum alloy piece to be plated that is obtained in step (3) into a film removal solution containing 6 moles / liter of concentrated nitric acid, soak it for 20 seconds at 25°C, and then wash it with deionized water Wash until no nitrate ions are detected. The obtained aluminum alloy plated piece is denoted as A3.

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Abstract

An aluminum alloy electroplating method comprises a preprocessing process and a electroplating process; wherein, the preprocessing process contains the process that an aluminum alloy substrate is used to contact with alkaline pickling solution, acid film-removing solution and surface adjustment fluid; wherein, the alkaline pickling solution is water solution containing alkali metal hydroxide and also contains pickling additive which is one or more of alkali metal silicate, glucose, alkali metal alginate, aromatic aldehyde, phenol, tragacanth and agar. By adding additives in the alkaline pickling solution in the preprocessing process, the invention can not only improve pretreatment so that the pure metal substrate can be exposed on the surface of the aluminum alloy so as to lay a good foundation for the subsequent metal layer deposition and increase the plating binding force, but also avoid the excessive corrosion of metal aluminium and ensure the smooth appearance of workpieces.

Description

technical field [0001] The invention relates to an aluminum alloy electroplating method. Background technique [0002] Aluminum and its alloys have excellent physical properties such as light weight, electrical conductivity and thermal conductivity, and have been widely used in modern aviation, aerospace, electric power, electronics, petroleum, chemical, building materials, transportation, light industry and national defense industries. In the continuous expansion of new application areas. [0003] Aluminum is a very special metal, which is easy to oxidize to form a protective film in the atmosphere, but as a typical amphoteric metal, it will be corroded in both acidic and alkaline environments, so its application is greatly limited. The electroplating of aluminum and its alloys can strengthen its physical properties on the one hand, and on the other hand, it can avoid the corrosion of it in the acid-base environment, so that it can be used in a wider range. [0004] There...

Claims

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Application Information

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IPC IPC(8): C25D5/30C25D5/44
Inventor 李爱华彭波李再春孙继鹏
Owner BYD CO LTD
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