Corrosion Resistant Object Having an Outer Layer of a Precious Metal
First Claim
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1. An object comprising:
- an electrically conductive body part,a first layer comprising a refractory metal or an alloy of a refractory metal, said first layer at least substantially covering an outer surface of the body part, anda second layer comprising a precious metal, said second layer at least substantially covering the first layer,wherein a metallurgical bond has been formed between the first and the second layer.
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Abstract
An object comprising a conductive body part, a layer comprising a refractory metal (e.g. tantalum), and a layer comprising a precious metal (e.g. platinum or gold). A metallurgical bond has been formed between the layers. Thereby oxidation of the refractory metal layer, and thereby passivation of the object, can be avoided even with small amounts of precious metal. This lowers the material costs while ensuring desired corrosion resistant properties. The object is suitable for an electrode to be used in a corrosive environment, in particular when a large conductivity is needed. Also a method of manufacturing the object. The metallurgical bond is provided by heating the object.
20 Citations
13 Claims
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1. An object comprising:
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an electrically conductive body part, a first layer comprising a refractory metal or an alloy of a refractory metal, said first layer at least substantially covering an outer surface of the body part, and a second layer comprising a precious metal, said second layer at least substantially covering the first layer, wherein a metallurgical bond has been formed between the first and the second layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of forming an object, the method comprising the steps of:
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providing an electrically conductive body part, applying a first layer to a surface part of the body part, said first layer comprising a refractory metal or an alloy of a refractory metal, applying a second layer on top of the first layer, said second layer comprising a precious metal, and heating at least the second layer during or after applying the second layer, thereby forming a metallurgical bond between the first and second layer. - View Dependent Claims (9, 10, 11, 12)
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13. A method of preventing formation of an oxide layer on an electrode, the method comprising the steps of:
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providing an electrode having an electrically conducting body part, applying a first layer to a surface part of the electrode, said first layer comprising a refractory metal or an alloy of a refractory metal, applying a second layer on top of the first layer, said second layer comprising a precious metal, and heating at least the second layer during or after applying the second layer, thereby forming a metallurgical bond between the first and second layer, thereby preventing formation of an oxide layer on the first layer.
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Specification