Method of electrolessly depositing nickel-phosphorus alloys

Details Method of electrolessly depositing nickel-phosphorus alloys Method of electrolessly depositing nickel-phosphorus alloys

1974-05-06

1976-04-27

Kendall, Ralph S.

Coating processes

Nonuniform coating

291966, 106 1, 427 92, 427305, 427438, C23C 302

Patent

active

039536246

ABSTRACT:
Nickel-phosphorus alloys are electrolessly deposited such that initial deposition takes place at a relatively rapid rate and at a particular acid pH, then when the nickel content of the bath has dropped to a low level, pH drops rather abruptly and the final material deposited has a high phosphorus content relative to the layers initially deposited. In this method the phosphorus content of the surface layers is closely controlled to maintain uniform behavior of the plating in subsequent soldering, wire-bonding and welding operations.

REFERENCES:
patent: 2658842 (1953-11-01), Gutzeit et al.
patent: 2772183 (1956-11-01), Talmey et al.
patent: 2822294 (1958-02-01), Gutzeit et al.
patent: 2935425 (1960-05-01), Gutzeit et al.
patent: 3138692 (1964-06-01), Bakker et al.
patent: 3325297 (1967-06-01), Talmey et al.
Pearlstein, "Modern Electroplating", Chapter 31 pp. 712, 713, 714, 715, 720, 721, c1974.

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