The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 16, 1999
Filed:
Mar. 17, 1998
Susanne M Opalka, Pittsburgh, PA (US);
Joseph T Laemmle, Delmont, PA (US);
Aluminum Company of America, Pittsburgh, PA (US);
Abstract
A method of controlling bulk absorption of atomic hydrogen and facilitating degassing of hydrogen from a metal or metal alloy workpiece during heat treatments in furnaces with ambient and/or moisture-laden atmospheres, the method includes exposing the surface of the workpiece to an acidified inorganic salt solution or dispersion, with the inorganic salt of the solution containing a transition metal cation and a sulfate, phosphate or nitrate anion, before being subjected to said heat-treatment, said transition metal cation having an equal or positive standard reduction half-reaction potential relative to metal or metal alloy workpiece, the workpiece exposed to the acidified transition metal sulfate, phosphate or nitrate salt is subjected to a heat treatment. The acidified transition metal sulfate, phosphate or nitrate salt is used to substantially decrease the amount of atomic hydrogen entering the bulk of the workpiece during heat treatment and to facilitate removal of atomic and molecular hydrogen from the bulk of the metal or metal alloy workpiece.