Method of controlling oxide scale formation and descaling...

Details Method of controlling oxide scale formation and descaling... Method of controlling oxide scale formation and descaling...

C - Chemistry, Metallurgy

25

F

204/85

C25F 1/06 (2006.01) C21D 1/76 (2006.01)

Patent

CA 1217451

ABSTRACT OF THE DISCLOSURE A process is provided for removing an oxide scale from the surface of a metal article and a process for the manufacture of metal articles which controls oxide scale formation and descaling thereof. A process includes providing an oxygen content of the thermal treatment atmosphere of at least 3.0%, by volume, after hot and cold forming to control the oxide scale formed. The descaling process includes immersing the article in an electrolyte of an aqueous solution of at least one neutral salt from the group consisting of the chloride, sulfate and nitrate of an alkali metal or ammonium, adjusting and maintaining a pH of 2.0 to 3.5 and passing a low density electric current through the immersed article. The article has an oxide scale substantially equivalent to an oxide scale formed at least in part in an oxidizing atmosphere of at least 3.0% oxygen, by volume. The processes may include the step of immersing in a mild acid solution to substantially remove the scale.

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