Electrochemical catalyst electrode to increase bonding durability between covering layers and a metal substrate
First Claim
1. An electrochemical catalyst electrode to increase bonding durability between covering layers and a metal substrate including a metal substrate with a porous surface and sequentially formed on the porous surface an oxygen interstitial layer, an inner covering layer and an outer covering layer, the electrode being made according to processes comprising the steps of:
- providing a metal substrate;
processing phase transformation at a high temperature to produce a phase transformation on the surface of the metal substrate and simultaneous oxidizing the metal substrate surface, and sensitizing the metal substrate surface through growing acid soluble spots on granular surfaces on the metal substrate surface;
etching the metal substrate surface with acid solution to form a plurality of pores on the granular surfaces on the metal substrate surface;
heating with oxygen in vacuum or in an oxygen-contained environment to transform the metal surface to the oxygen interstitial layer; and
laminating to sequentially form the inner covering layer and the outer covering layer over the oxygen interstitial layer on metal substrate by employing a method selecting from the group of heat decomposition, chemical vapor deposition, sol-gel process or plasma spray oxide.
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Accused Products
Abstract
An electrochemical catalyst electrode to increase bonding durability between covering layers and a metal substrate is made by processing a metal substrate at a high temperature and etching the metal substrate to form a large number of etching pores on granular surfaces; heating the metal substrate to transform the surface thereof to an oxygen interstitial layer; laminating an inner covering layer which is compatible to the oxygen interstitial layer on the metal substrate and deeply planted into the pores to form included angles to increase adhering force between the inner covering layer and the substrate and to reduce peeling on the interface; and forming an outer covering layer on the layers with stabilizing additive added in the outer covering layer to enhance the stability of the outer surface of the covering layers thereby to reduce dissolution of noble metal; and greatly increase stability and durability of the electrode.
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Citations
8 Claims
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1. An electrochemical catalyst electrode to increase bonding durability between covering layers and a metal substrate including a metal substrate with a porous surface and sequentially formed on the porous surface an oxygen interstitial layer, an inner covering layer and an outer covering layer, the electrode being made according to processes comprising the steps of:
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providing a metal substrate;
processing phase transformation at a high temperature to produce a phase transformation on the surface of the metal substrate and simultaneous oxidizing the metal substrate surface, and sensitizing the metal substrate surface through growing acid soluble spots on granular surfaces on the metal substrate surface;
etching the metal substrate surface with acid solution to form a plurality of pores on the granular surfaces on the metal substrate surface;
heating with oxygen in vacuum or in an oxygen-contained environment to transform the metal surface to the oxygen interstitial layer; and
laminating to sequentially form the inner covering layer and the outer covering layer over the oxygen interstitial layer on metal substrate by employing a method selecting from the group of heat decomposition, chemical vapor deposition, sol-gel process or plasma spray oxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification