High-temperature conductive protective composite coating as well as preparation method and application thereof

Abstract

The invention relates to the technical field of high-temperature conductive protective coatings, in particular to a high-temperature conductive protective composite coating and a preparation method and application thereof.The high-temperature conductive protective composite coating comprises a metal Ni diffusion barrier inner layer and a Ni-Co-W alloy outer layer, the metal Ni diffusion barrier inner layer is formed on a ferritic stainless steel connector, and the Ni-Co-W alloy outer layer is formed on the metal Ni diffusion barrier inner layer. And preparing the metal Ni diffusion barrier inner layer and the Ni-Co-W alloy outer layer by adopting an electroplating technology. The inner layer of the metal Ni diffusion barrier is good in binding force, so that mutual diffusion between a ferritic stainless steel connector matrix element and an Ni-Co-W alloy outer layer element can be effectively prevented, and the problem that the high-temperature oxidation resistance of the coating is reduced due to mutual diffusion between the ferritic stainless steel connector matrix element and the Ni-Co-W alloy outer layer element is solved; and holes in the oxide layer formed by mutual diffusion are also avoided, and the situation that the compactness of the oxide layer is damaged by the holes, so that the high-temperature conductive protective coating cannot play a protective role is prevented.

Description

technical field [0001] The invention relates to the technical field of high-temperature conductive protective coatings, in particular to a high-temperature conductive protective composite coating, a preparation method and an application thereof. Background technique [0002] At present, the reserves of primary energy such as oil and coal on the earth are limited, which cannot meet the long-term needs of human beings. Moreover, the combustion of traditional fossil fuels releases polluting gases such as sulfur, carbon, and nitrogen, causing great damage to the earth's environment. Therefore, improving energy utilization efficiency and developing new clean and renewable energy are necessary means for human beings to solve the energy crisis. Solid Oxide Fuel Cell (SOFC) is different from a battery in the conventional sense, it is an electrochemical power generation device. SOFC directly converts the chemical energy of fuel and oxidant into electrical energy without going throu...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of high-temperature conductive protective composite coating, preparation method and application thereof, solve the problem of the connection between the Co element in the Ni-Co-W alloy outer layer and the ferritic stainless steel connector. The problem of the damage and failure of the protective coating caused by the interdiffusion of elements between

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