Semi-bright nickel plating bath and method of using same

A semi-bright nickel and nickel electroplating technology, applied in the field of semi-bright nickel electroplating bath, can solve the problem of not reaching leveling and the like

Inactive Publication Date: 2013-11-27
MACDERMID ACUMEN INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, none of these baths achieved leveling close to that of the full coumarin system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A stock solution of a semi-bright nickel plating bath was prepared having 40 oz / gal of nickel sulfate hexahydrate, 4.5 oz / gal of nickel chloride hexahydrate, and 5.5 oz / gal of boric acid. The solution was carbonized and hydrogen peroxide treated, filtered, and the pH was adjusted to 3.8-4.0. Subsequently, a 6% by weight solution of dihexyl sulfosuccinate was added at 0.3% v / v to prevent the formation of pitting in subsequent electroplated deposits.

[0067] will be 330cm 3 This solution was added to a hull cell equipped with an air stirrer and heated to 135°F. 2 g / l sodium acetate was added to the plating bath and the brass panels were electroplated at 2 amps for 15 minutes. The resulting deposit was an overall gray color with glossy depressions. 0.1% of a 70 / 30 mixture of hexynediol and butynediol was added to a total concentration of 0.15 g / l. The final deposited layer is glossy to semi-bright at about 0 to 40 ASF and dull above 40 ASF, very dull near the high cur...

Embodiment 2

[0072] Freshly made bright stock solutions are added to the air-stirred Hall tank. Subsequently, 2.0 g / l of sodium monochloroacetate was added to the plating bath, and 0.2% of a mixture of hexynediol and butynediol was added so that the total concentration was 0.30 g / l. The scratched brass panel was electroplated at 2 amps for 15 minutes. The resulting deposit was completely glossy semi-bright with some slight dullness at the end of the HCD edge of the panel. The panel was electroplated with bright nickel for 5 minutes as described in Example 1 above, and the leveling was 65% of that of a commercial coumarin bath.

Embodiment 3

[0074] Example 2 was repeated, but the bath pH was increased to 4.6. The resulting deposit was slightly brighter than Example 2. Bright nickel was plated thereon and evaluated for leveling as described above. The leveling of the deposited layer was almost the same as that of the whole coumarin bath plating. The concentration of the mixture of hexynediol and butynediol was increased such that the overall concentration was 0.45 g / l. The leveling of the deposited layer is now the same as that of the deposited layer plated from a commercial coumarin bath.

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Abstract

A nickel plating bath for plating a semi-bright nickel deposit on a substrate comprising a) nickel sulfateions; b) a soluble salt of chloroacefic acid, acetic acid, glycolic acid, proprionic acid, benzoic acid, salicylic acid or chlorobenzoic acid; and c) at least one diol selected from the group consisting of hexyne diol, butyne diol and combinations of the foregoing. The semi-bright nickel plating bath described herein produces sulfur-free semi-bright deposits over a very wide current density range. The plating bath described herein is at least substantially free of coumarin and produces desirable leveling characteristics. The bath also requires no aldehydes to achieve simultaneous thickness and electrolytic potential (STEP) and has extremely low stress and excellent ductility.

Description

[0001] Cross-references to related applications [0002] This application is a continuation-in-part of US Application No. 12 / 620,746, filed November 18, 2009, the subject matter of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention generally relates to semi-bright nickel electroplating baths that provide excellent planarization, ductility, and stress properties and contain little sulfur. Background technique [0004] Bright nickel plating baths are used in the automotive, electronics, appliance, hardware and other industries. The most important use of bright nickel plating is as an undercoat for chrome plating, assisting the retoucher in obtaining a smooth, bright finish and providing adequate corrosion protection. [0005] For decorative plated parts requiring a high level of base metal corrosion protection, semi-bright nickel deposits are almost always used in conjunction with subsequent bright nickel and chromium dep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/12B05D5/12
CPCC25D3/16
Inventor R·A·特雷梅尔
Owner MACDERMID ACUMEN INC
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