EP0073583A1
Expired / Lapsed
EP
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Electroless nickel-boron plating
Assignee: Richardson Chemical Co
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Filing: 1982-08-10
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Granted: —
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Expires: 2002-08-10
Abstract
Abstract The boron content of an electroless nickel-boron deposit is enhanced by including in the bath a source of zirconyl ions or vanadyl ions, which bath can be operated at moderate temperature and pH despite the fact that boranes can be used as reducing agents. The deposit laid down has a boron content of at least about 2 weight %, based on the total weight of the deposit. The source of the ions may be for example zirconyl chloride, vanadyl sulfate or sodium metavanadate at a concentration between 0.001 and 0.1 mol per liter of the bath.
Inventors
- 👤 Glenn O. Mallory
- 👤 Theresa Horhn
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 06:42
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/32; C23C18/34
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
41 words
An electroless nickel bath for laying down a nickel-boron deposit, said bath comprising: a bath-soluble source of nickel and a bath-soluble borane reducing agent; and being characterized in that it includes zirconyl ions, vanadyl ions, or a combination or mixture thereof.
Claim 2
Dependent Claim
41 words
An electroless nickel bath for laying down a nickel-boron deposit, said bath comprising: a bath-soluble source of nickel and a bath-soluble borane reducing agent; and being characterized in that it includes zirconyl ions, vanadyl ions, or a combination or mixture thereof.
Claim 3
Dependent Claim
25 words
An electroless bath according to claim 1, wherein the said ions derive from the compound zirconyl chloride, vanadyl sulfate, sodium metavanadate, or a mixture thereof.
Claim 4
Dependent Claim
32 words
An electroless bath according to claim 2, wherein said compound is included within the bath at a concentration of at least about 0.0005 mol per liter, based on the total bath value.
Claim 5
Dependent Claim
46 words
An electroless bath according to claim 1, claim 2 or claim 3, wherein said reducing agent is an amine borane or a cyclic amine borane, present within the bath at a concentration of at least about 0.001 mol per liter, based on the total bath volume.
Claim 6
Dependent Claim
36 words
An electroless bath according to any one of the preceding claims, wherein said bath further includes a complexing agent at a concentration of at least about 0.0005 mol per liter, based on the total bath volume.
Claim 7
Dependent Claim
31 words
An electroless bath according to claim 5, wherein said complexing agent is a carboxylic acid or hydroxy substituted carboxylic acid or a bath soluble derivative of either, or an organophosphoric compound.
Claim 8
Dependent Claim
24 words
An electroless bath according to claim 5, wherein said complexing agent is an ester complex of an oxyacid and a polyhydric acid or alcohol.
Claim 9
Dependent Claim
26 words
An electroless bath according to any one of the preceding claims which further includes at least one of a stabilizer, a buffer and a codeposition enhancer.
Claim 10
Dependent Claim
19 words
An-electroless bath according to any one of the preceding claims which is at a pH of less than 13.
Claim 11
Dependent Claim
19 words
An electroless bath according to claim 9 which is at a pH of between about 4 and about 10.
Claim 12
Dependent Claim
19 words
An electroless bath according to claim 10 which is at a pH of between about 5 and about 7.
Claim 13
Independent Claim
36 words
A method for electrolessly plating with a nickel-boron deposit, comprising immersing a substrate into an electroless nickel bath and depositing a high-boron-content nickel-boron deposit thereon, said bath being according to any one of the preceding claims.
Claim 14
Dependent Claim
17 words
A method according to claim 12,wherein said bath is at a temperature of not greater than 90°C.
Claim 15
Dependent Claim
33 words
A method according to claim 12 or claim 13, wherein said depositing step lays down a deposit including at least about 2 weight % boron, based on the total weight of the deposit.
Claim 16
Dependent Claim
27 words
A method according to claim 14, wherein said percentage of boron is as great as about 5 weight %, based on the total weight of the deposit.
Claim 17
Dependent Claim
30 words
An electroless nickel-boron deposit onto a substrate, said deposit having been laid down by immersing a substrate into an electroless bath according to any one of claims 1 to 11.
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