Electroless nickel baths for enhancing hardness

Details Electroless nickel baths for enhancing hardness Electroless nickel baths for enhancing hardness

1994-07-05

1996-02-27

Padgett, Marianne

Coating processes

Immersion or partial immersion

Metal base

4274431, 106 127, B05D 304, B05D 118

Patent

active

054947103

ABSTRACT:
Electroless nickel baths for producing high hardness nickel alloys "as-deposited" containing phosphorus which are produced using baths employing hypophosphite reducing agents at a particular pH range advantageously above 6 and in the presence of a fluoborate anion. The nickel phosphorus alloys "as-deposited" do not require age or heat treatments to produce high hardness with Vickers Harness Number values above about 700 and generally above about 800 to 900 (VHN.sub.100) and have phosphorus contents below about 4 weight percent and a crystalline nature with crystallite diameters in excess of 60 Angstroms.

REFERENCES:
patent: 3432338 (1969-03-01), Sickles
patent: 3667972 (1972-06-01), Coll-Palagos
patent: 3726771 (1973-04-01), Coll-Palogos
patent: 5213907 (1993-05-01), Caballero
patent: 5252360 (1993-10-01), Huttl
patent: 5258061 (1993-11-01), Martyak

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