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Chemical nickeling solution, method for preparing nickeling layer and aluminium alloy hub coating thereof

A technology of electroless nickel plating and aluminum alloy wheel hub, applied in liquid chemical plating, coating, metal material coating process, etc. Corrosion resistance and low product qualification rate

Inactive Publication Date: 2005-05-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the shape of the wheel hub, the thickness distribution of the electroplated nickel pre-plating layer is very uneven, the coating layer is thin and dull at low current density, and it needs to be polished after pre-plating, so the corrosion resistance and product qualification rate of the electroplated aluminum wheel hub are low. Can not meet the needs of the market

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0004] Specific embodiment one: the electroless nickel plating solution of the present embodiment is made up of following composition: 5.6~6.0g / l Ni 2+ , 25~30g / l NaH 2 PO 2 ·H 2 O, 10-45g / l ligand, 0-20g / l phosphorus inhibitor, 5-30g / l buffer. The ligand is one or a mixture of lactic acid, citric acid, glycine, succinic acid, glycolic acid, propionic acid, malic acid, glutaric acid, triethanolammonium, ammonium chloride; the phosphorus The inhibitor is one or a mixture of ammonium sulfate, ammonium chloride, and sodium tungstate; the buffer is one or a mixture of sodium acetate, sodium propionate, and boric acid. The Ni 2+ Add in the form of nickel carbonate or basic nickel carbonate.

specific Embodiment approach 2

[0005] Specific embodiment two: the acidic electroless nickel plating solution of the present embodiment is made up of following composition: 5.6~6.0g / l Ni 2+ , 25~30g / l NaH 2 PO 2 ·H 2 O, 10~25g / l 1 # Ligand, 10~20g / l2 # Ligand, 5~30g / l buffer. said 1 # The ligand is one or a mixture of lactic acid, citric acid, glycine, succinic acid, glycolic acid; the 2 # The ligand is one or a mixture of propionic acid, malic acid, succinic acid, and glutaric acid; the buffer is one or a mixture of sodium acetate, sodium propionate, and boric acid.

specific Embodiment approach 3

[0006] Specific embodiment three: the acidic electroless nickel plating solution of the present embodiment is made up of following composition: 5.8g / l NiCO 3 , 28g / l NaH 2 PO 2 ·H 2 O, 18g / l glycine, 15g / l glutaric acid, 20g / l sodium acetate.

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PUM

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Abstract

The invention was involved in a chemical nickel-plating liquid, its method and aluminum alloy wheel boss coating thereby. The said liquid contains 5.6-6.0g, / L Ni2+, 25-30g / L NaH2PO2.H2O, 10-45g / L ligand, 0-20g / L phosphorus inhibiter and 5-30g / L buffering agent. The treated aluminum alloy wheel boss was immersed into the above liquid to form chemical nickel coating by the method. The aluminum alloy wheel boss coating consist of electroplated pre-plating coating, electro-coppering, three-layer nickels, nickel closing layer, bright chrome layer and chemical nickel coating which was located in pre-plating coating or mediate layer of aluminum alloy wheel boss coating. The corrosion resistance of coating was improved obviously. It could endure over 88h on CASS test.

Description

Technical field: [0001] The invention relates to an electroless nickel plating solution, a method for preparing an electroless nickel plating layer with the electroless nickel plating solution, and an aluminum alloy wheel hub coating composed of the nickel plating layer prepared with the electroless nickel plating solution. Background technique: [0002] In the 1970s and 1980s, due to the characteristics of light weight, good thermal conductivity, good processability and easy realization of the designer's creative thinking, aluminum alloy wheels gradually replaced steel wheels and achieved rapid development. The most commonly used surface treatment technology for aluminum wheels is painting. With the continuous improvement of people's living standards, electroplated aluminum wheels have gained more and more market demand due to their bright appearance, luxury and good corrosion resistance. At present, the global electroplated aluminum wheel manufacturers mostly adopt electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/32
Inventor 胡信国戴长松王殿龙
Owner HARBIN INST OF TECH
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