Method for surface activation of water atomized powders

Details Method for surface activation of water atomized powders Method for surface activation of water atomized powders

1987-07-09

1989-04-04

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 54, 419 30, 419 62, 419 66, B22F 100

Patent

active

048184829

ABSTRACT:
A method for pickling and consolidating water atomized metallic powders to reduce surface oxides. The technique includes introducing the powder into an acid bath--preferably nitric acid and hydrofluoric acid, rinsing the powder, introducing the powder into an alkaline bath, rinsing the powder and then consolidating the powder into a workpiece. Alternatively, the powder can be additionally introduced into a second acid bath and/or placed into a finishing boric acid bath before consolidation.

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B. S. Covino, Jr., J. V. Scalera, T. J. Driscoll and J. P. Carter, "Dissolution Behavior of 304 Stainless Steel in HNO.sub.3 /HF Mixtures", Metallurgical Transactions A, vol. 17 A, Jan. 1986, pp. 137-149.

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