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Pretreatment activating solution and pretreatment method for chemical nickel-plating of aluminum and aluminum alloy

A technology of electroless nickel plating and aluminum alloy, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve the problems of pollution of electroless nickel plating solution and production environment, and improve the bonding force and durability of the coating. corrosion resistance, prolong service life and simplify process

Inactive Publication Date: 2010-06-30
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an aluminum and aluminum alloy that avoids polluting the electroless nickel plating solution and the production environment in view of the defect that the zinc immersion activation treatment solution pollutes the electroless nickel plating solution and the production environment in the prior art. Pretreatment Activation Solution for Alloy Electroless Nickel Plating

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  • Pretreatment activating solution and pretreatment method for chemical nickel-plating of aluminum and aluminum alloy

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Effect test

Embodiment 1

[0027] Embodiment 1, containing nickel sulfate hexahydrate 15g, sodium hypophosphite 5g, sodium citrate 80g, ammonium chloride 40g in the pretreatment activation solution of every liter of aluminum and aluminum alloy electroless nickel plating, pretreatment activation solution preparation: be The above raw materials are prepared by adding water. Its pH is 8.5.

[0028] Pretreatment: first use 15% NaOH solution by mass percentage to chemically degrease the aluminum parts to be electroless nickel plated at 60 ° C, then wash with hot water, and then rinse with cold water until no water drops, then use 55g / L NaOH solution at a temperature of 55°C to deoxidize the film and rinse with distilled water. Afterwards, put the deoxidized aluminum parts into the above-mentioned ratio of aluminum and aluminum alloy electroless nickel plating pretreatment activation solution for alkaline activation treatment, the temperature of the alkaline activation treatment is 25° C., and the time is 2...

Embodiment 2

[0030] Embodiment 2, the pretreatment activation solution of every liter of aluminum and aluminum alloy electroless nickel plating contains nickel sulfate hexahydrate 40g, sodium hypophosphite 15g, sodium citrate 120g, ammonium chloride 60g, pretreatment activation solution preparation: be The above raw materials are prepared by adding water. Its pH is 9.5.

[0031] Pretreatment: First, use 10% NaOH solution by mass to degrease the aluminum alloy workpiece that needs electroless nickel plating at a temperature of 50°C, then wash it with hot water, and then rinse it with cold water until no water drops, then use 50g / L NaOH solution at 50°C to deoxidize the film and rinse with distilled water. Afterwards, put the deoxidized aluminum parts into the above-mentioned ratio of aluminum and aluminum alloy electroless nickel plating pretreatment activation solution for alkaline activation treatment, the temperature of the alkaline activation treatment is 50°C, and the time is 8min. R...

Embodiment 3

[0033] Embodiment 3, the pretreatment activation solution of every liter of aluminum and aluminum alloy electroless nickel plating contains nickel sulfate hexahydrate 20g, sodium hypophosphite 7g, sodium citrate 90g, ammonium chloride 45g, pretreatment activation solution preparation: be The above raw materials are prepared by adding water. Its pH is 9.

[0034] Pretreatment: first use 20% NaOH solution by mass to degrease the aluminum parts to be electroless nickel plated at 70°C, then wash with hot water, then rinse with cold water until no water drops, then use 60g / L NaOH solution at 60°C to deoxidize the film and rinse with distilled water. Afterwards, put the deoxidized aluminum parts into the above-mentioned ratio of aluminum and aluminum alloy electroless nickel plating pretreatment activation solution for alkaline activation treatment, the temperature of the alkaline activation treatment is 30° C., and the time is 4 minutes. Rinse with cold water after activation. ...

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Abstract

The invention relates to pretreatment activating solution and a pretreatment method for the chemical nickel-plating of aluminum and an aluminum alloy. The pretreatment activating solution for the chemical nickel-plating of the aluminum and the aluminum alloy is prepared by mixing water and the following raw materials in part by weight: 15 to 40 parts of nickel sulfate hexahydrate, 5 to 15 parts of sodium hypophosphite, 80 to 120 parts of sodium citrate and 40 to 60 parts of ammonium chloride. The pretreatment method comprises: removing oil from an aluminum or aluminum alloy workpiece with alkaline liquid and washing the workpiece with water; removing an oxidation film and washing the workpiece with water; and performing alkaline activation treatment by using the pretreatment activating solution for the chemical nickel-plating of the aluminum and the aluminum alloy and washing the workpiece after the treatment. The pretreatment activating solution for the chemical nickel-plating of the aluminum and the aluminum alloy provided by the invention is used for the pretreatment of the chemical nickel-plating of the aluminum and the aluminum alloy to form micro-thin nickel having plated metal growing activity on the surface of the aluminum and the aluminum alloy, which has an excellent effect on the subsequent chemical nickel-plating and improves the bonding strength and corrosion resistance of the plating; and the pretreatment method is simple in process, reduces pollution and improve production environment.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a pretreatment activation solution and a pretreatment method for electroless nickel plating of aluminum and aluminum alloys. Background technique [0002] Since aluminum is an active metal, the surface of aluminum and aluminum alloys is easy to react with oxygen and water vapor in the air to form a thin oxide film. This layer of oxide film can lead to weak adhesion between the metal coating and the aluminum substrate. to process requirements. Therefore, aluminum and aluminum alloys must be activated to eliminate oxide films before plating to ensure good adhesion of aluminum and aluminum alloys during plating. [0003] So far, research and development and production-verified process methods have been relatively concentrated on the use of galvanizing-pre-coating method. This method has many disadvantages: 1, the galvanizing layer pollutes the electrole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/18C23C18/32
Inventor 周明杰许勇
Owner OCEANS KING LIGHTING SCI&TECH CO LTD