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Passivation of Molybdenum

IP.com Disclosure Number: IPCOM000090136D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Pennebaker, WB: AUTHOR [+2]

Abstract

This technique is for the passivation or formation of oxide on the surface of molybdenum. An oxide of molybdenum MoO(2) is formed on the surface of the molybdenum. This oxide is insoluble in water. The passivation of molybdenum is accomplished by chemical anodization using, for example, a platinum cathode. Anodic MoO(2) forms in several electrolytes such as 10% HNO(3) in H(2)O, 10% HCl in H(2)O, and Na(4)EDTA. The oxide MoO(2) is formed in these electrolytes but only at relatively low voltages, approximately 1.2 volts in HNO(3) - H(2)O and up to 6 volts in Na(4)EDTA. If higher voltages are used, the resulting oxide films are so thick that they lose adherence or convert to a different oxidation state.

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Passivation of Molybdenum

This technique is for the passivation or formation of oxide on the surface of molybdenum. An oxide of molybdenum MoO(2) is formed on the surface of the molybdenum. This oxide is insoluble in water. The passivation of molybdenum is accomplished by chemical anodization using, for example, a platinum cathode. Anodic MoO(2) forms in several electrolytes such as 10% HNO(3) in H(2)O, 10% HCl in H(2)O, and Na(4)EDTA. The oxide MoO(2) is formed in these electrolytes but only at relatively low voltages, approximately 1.2 volts in HNO(3) - H(2)O and up to 6 volts in Na(4)EDTA. If higher voltages are used, the resulting oxide films are so thick that they lose adherence or convert to a different oxidation state. Where the oxides formed are insoluble in the electrolyte used, thick films can be formed rapidly since oxide formation is not self-limiting. As a result, anodization times in the order of a few seconds are desirable.

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