Electrodeposited Ni-Co-Al-Cr high-temperature composite coating and preparation method thereof

Abstract

The invention discloses an electrodeposited Ni-Co-Al-Cr high-temperature composite coating and a preparation method thereof. The electrodeposited Ni-Co-Al-Cr high-temperature composite coating is characterized in that the electrodeposited Ni-Co-Al-Cr high-temperature composite coating adopts a metal material as a matrix; the surface of the matrix is pretreated; then a composite plating solution taking nickel sulfate and cobalt chloride as main components and taking aluminium powder and chromium powder as dispersion phases is compounded; the composite plating solution is subjected to ultrasonic dispersion treatment; by reasonably setting electrodeposition parameters, intensive mixing is carried out to allow aluminium powder particles and chromium powder particles to be uniformly dispersed in the composite plating solution; and in an electric current applied state, the aluminium powder particles, the chromium powder particles, and matrix Ni and Co are subjected to codeposition and vacuum diffusion heat treatment to form the electrodeposited Ni-Co-Al-Cr high-temperature composite coating. The element contents of Al and Cr in the electrodeposited Ni-Co-Al-Cr high-temperature composite coating are higher; the electrodeposited Ni-Co-Al-Cr high-temperature composite coating has excellent high-temperature oxidation resistance at 1100 degrees; the defects that a hot spraying MCrAlY (M=Ni, Co, Fe or alloys of Ni, Co and Fe) coating is high in porosity and the interface bonding strength is low are overcome; the high-temperature mechanical properties and the high-temperature oxidation resistance of the conventional Ni-Cr, Ni-Al and Ni-Cr-Al composite coatings are improved; and the electrodeposited Ni-Co-Al-Cr high-temperature composite coating is suitable for surface protection of high-temperature working components and parts in the fields of aviation, metallurgy, chemical engineering, heat energy, etc.

Description

technical field [0001] The invention relates to an electrodeposited Ni-Co-Al-Cr high-temperature composite coating and a preparation method thereof. Background technique [0002] Nickel-based and cobalt-based superalloys have good high-temperature mechanical properties, high-temperature creep resistance and oxidation resistance, and are widely used in high-temperature hot-end components in the fields of aero-engines, thermal energy, and metallurgy. Al and Cr are commonly used alloying elements in high-temperature alloys. Al and Cr elements have high activity and can form protective continuous Al on the surface of the alloy. 2 o 3 or Cr 2 o 3 The film can protect the metal substrate from further high temperature oxidation, thereby improving the oxidation resistance of the substrate. Increasing the content of Al and Cr in the alloy increases the oxidation resistance of the superalloy, but its high-temperature mechanical properties decrease. Therefore, the content of Al or...

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Problems solved by technology

In recent years, Ni-Cr, Ni-Al and Ni-Cr-Al high-temperature composite coatings have been prepared in weakly acidic baths by composite electrodeposition technology, but Ni-Co-Al-Cr high-temperature composite coatings have not been reported yet.

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