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Pretreating Steel Scrap to Speed Oxidation.

PB190027

Publication Date	1970
Personal Author	Khalafalla, S. E.; Payne, S. L.; Reimers, G. W.
Page Count	24
Abstract	The extremely sluggish oxidation of steel scrap was appreciably accelerated when the charge was pretreated in aqueous solutions of sodium metavanadate or sodium molybdate. The degree of oxidation acceleration was inversely correlated with the melting point of the promoter oxide possessing the highest valency. The magnitude of oxidation enhancement exhibited a systematic inverse dependence on the duration of pickling processes; mere dipping of the oxidizable charge in the vanadate bath was most effective. In general, the rate of steel scrap oxidation increased with increasing concentrations of the pickling reagent. The results are explained on the basis of the hydrolytic decomposition of the pickling agent with subsequent slow interaction with the metal surface, coupled with the tendency of vanadium to form polyanions in alkaline media. The data not only served to elucidate the mechanism by which catastrophic oxidation takes place, but also showed that the accelerating species need not be alloyed with the oxidizable metal; surface impregnation by minute amounts of the accelerating species can still produce catastrophic effects. (Author)
Keywords	Steel Oxidation Vanadates Pickling compositions Molybdates Surface properties Iron alloys Metal scrap
NTIS Subject Category	71J - Iron & Iron Alloys
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Report of Investigations.
NTIS Issue Number	197009

Pretreating Steel Scrap to Speed Oxidation.

Pretreating Steel Scrap to Speed Oxidation.
PB190027

Publication Date	1970
Personal Author	Khalafalla, S. E.; Payne, S. L.; Reimers, G. W.
Page Count	24
Abstract	The extremely sluggish oxidation of steel scrap was appreciably accelerated when the charge was pretreated in aqueous solutions of sodium metavanadate or sodium molybdate. The degree of oxidation acceleration was inversely correlated with the melting point of the promoter oxide possessing the highest valency. The magnitude of oxidation enhancement exhibited a systematic inverse dependence on the duration of pickling processes; mere dipping of the oxidizable charge in the vanadate bath was most effective. In general, the rate of steel scrap oxidation increased with increasing concentrations of the pickling reagent. The results are explained on the basis of the hydrolytic decomposition of the pickling agent with subsequent slow interaction with the metal surface, coupled with the tendency of vanadium to form polyanions in alkaline media. The data not only served to elucidate the mechanism by which catastrophic oxidation takes place, but also showed that the accelerating species need not be alloyed with the oxidizable metal; surface impregnation by minute amounts of the accelerating species can still produce catastrophic effects. (Author)
Keywords	Steel Oxidation Vanadates Pickling compositions Molybdates Surface properties Iron alloys Metal scrap
NTIS Subject Category	71J - Iron & Iron Alloys
Corporate Authors	BUREAU OF Mines, Washington, D.C.
Document Type	Technical Report
Title Note	Report of Investigations.
NTIS Issue Number	197009