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Aqueous alkaline zincate solutions and method for depositing zincate coating on aluminium or aluminium substrate

A technology of zincate and aqueous solution, which is applied in the direction of coating, liquid chemical plating, metal material coating technology, etc., and can solve the problems of complex selection of complexing agent and complex zincate composition, etc.

Inactive Publication Date: 2009-04-08
ATOTECH DEUT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, zincate compositions for making alloys are becoming increasingly complex due to the addition of other metal ions
This makes the choice of complexing agent more complicated and more critical to the overall performance of the zincate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment A-H

[0052] ＊ All parts are g / l, remainder is water

[0053] Table II

Embodiment I-M

[0056] ＊ All parts are g / l, remainder is water

[0057] The zincate solutions of the present invention described above are used in depositing alloy zincate coatings as a pretreatment for aluminum and various aluminum alloys. In one embodiment, the zincate solutions of the present invention are free of cyanide ions, and such cyanide-free zincate solutions provide equal or better the result of. The use of inhibitors in the zincate solution, and the combination of inhibitors and complexing agents described above, are believed to be responsible, at least in part, for the improved properties of the zincate solution for making alloys of the present invention. The inhibitors affect the zincate deposition rate and provide a thin uniform coating on aluminum and aluminum alloys. About 2-6 mg / ft can be obtained using the zincate solution described here 2 zincate coating weight.

[0058] In addition to aluminum, the zincate solutions of the present invention can be used to dep...

Embodiment 1-10

[0069] A zincate coating was deposited on wrought aluminum alloys 2024 and 6061 using the zincate solutions of Examples C-L. Slight precipitation was observed in the solutions of Examples F, G and I-K, while no precipitation was observed in the remaining solutions. The zincate-treated aluminum alloys were then plated in a Nichem-2500 (Atotech USA) electroless nickel bath at about 95°C for 70 minutes. The coated samples were rinsed with water, dried, and adhesion was determined using the 90° bend test described above. The results are summarized in Table III below.

[0070] Table III

[0071] 90° bend adhesion test results

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PUM

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Abstract

The present invention provides an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and / or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine. The present invention also relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution.

Description

field of invention [0001] This invention relates to aqueous alkaline zincate solutions and methods of depositing zincate coatings onto aluminum or aluminum alloy substrates. The invention also relates to metallized aluminum or aluminum alloy substrates. Background of the invention [0002] One of the fastest growing markets worldwide is the processing and plating of aluminum and its alloys. Aluminum's unique physical and mechanical properties make it particularly attractive in industries such as automotive, electronics, telecommunications, avionics, and a plethora of decorative applications. Aluminum's most popular properties include its low overall density (2.7 g / cc), its high mechanical strength achieved during alloying and heat treatment, and its relatively high corrosion resistance. Other properties include; high thermal and electrical conductivity, its magnetic neutrality, high scrap value, and its amphoteric chemistry. Most aluminum parts are made from aluminum allo...

Claims

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Application Information

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IPC IPC(8): C23C18/31C23C18/18C25D5/44C23C18/16C23C18/52C25D5/14
CPCC23C18/52C23C18/1653C23C18/54C25D5/14C23C18/1651C25D5/627
Inventor N·H·乔施M·D·梅塔
Owner ATOTECH DEUT GMBH
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