Process for the heat treatment of Al alloys containing Li with a

Details Process for the heat treatment of Al alloys containing Li with a Process for the heat treatment of Al alloys containing Li with a

1988-03-07

1989-01-24

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

C21D 174

Patent

active

047999764

ABSTRACT:
The invention relates to a process for improving the surface condition of Li-containing Al alloy products. According to the process, heating at a temperature exceeding 300.degree. C. takes place in an atmosphere containing, in volume percent, 5 to 98% CO.sub.2, 2.ltoreq.dry air.ltoreq.95% and the remainder water. The process prevents the appearance of surface pitting and reduces the depth of the Li-depleted surface zone.

REFERENCES:
patent: 3084080 (1963-04-01), Hunter et al.
patent: 4534807 (1985-08-01), Field et al.

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