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Low temperature chromizing coating, its preparation method and application

A chromizing and coating technology, which is applied in the field of low-temperature chromizing coating and its preparation, can solve the problems of grain coarsening, high energy consumption restricting development, deterioration of strength and plasticity, etc., and achieves reduced growth rate, low cost, damage reduction effect

Inactive Publication Date: 2007-04-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, at present, the temperature of chromizing by solid powder method is usually above 1000°C, such a high temperature seriously affects the structure and comprehensive properties of the substrate, such as coarsening of grains, deterioration of strength and plasticity
In addition, the high energy consumption of this process also greatly limits its development, so reducing the chromizing temperature has very important industrial application value

Method used

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  • Low temperature chromizing coating, its preparation method and application
  • Low temperature chromizing coating, its preparation method and application
  • Low temperature chromizing coating, its preparation method and application

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Embodiment

[0032] In this embodiment, the first Ni-CeO on the low carbon steel 2 Composite electroplating followed by diffusion chromizing to prepare CeO 2 Modified chromized coating as an example:

[0033] The composition of the chromized coating modified by rare earth oxides: the chromium content of the surface layer is 50-90 parts, and its composition is in a gradually decreasing distribution state from the surface to the inside. Oxide CeO 2 4-8 parts, the balance is M (Ni, Fe or Co), from the composite coating;

[0034]The preparation method is as follows: preparing M-rare earth oxide composite coating by using composite electroplating technology. M is Ni, Fe or Co, and generally selects the same element as the main component of the matrix material. The matrix material is Fe, Ni, Co, carbon steel, alloy steel with poor oxidation resistance, and the commonly used sulfate system (MSO 4 ) plating solution. This embodiment selects Ni low-temperature neutral sulfate bath to prepare ...

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Abstract

The invention disclosed a technology of coating preparation, which was a two-step process of low temperature chromized coating with its preparation method and application. Chromized coating was composed of inspersed chrome, M, derived from composite deposite, and small quantity of rare earth oxide. Rare earth oxide was RexOy representing Re=Ce,Y,La etc. Calculating by quality quota, the content of chrome in superficial coat was 50 to 90, the rest was M and rare earth oxide, in which M was derived from M-RexOy composite deposite. The preparation process were as follows: Taking Ni, Fe or Co, carbon steel or lean alloy steel as backings, M-RexOy composite deposite of nanocrystal was got with complex electric plating. Then, modified chromized coating was achieved by diffusing chromizing under 600deg.C-800deg.C. The temperature of traditional chromizing craft was debased from over 1000 deg.C to 600deg.C-800deg.C. The craft was simple to generalizing. The coat could get thermally grown and compact oxide film with good non-oxidizability.

Description

technical field [0001] The invention relates to coating preparation technology, in particular to a low-temperature chromizing coating and its preparation method and application. Background technique [0002] The basic principle of chromizing with solid powder method is to embed the workpiece in the prepared infiltrating agent, hold it for a certain period of time in an argon atmosphere and at a certain temperature, and make chromium penetrate into the surface of the workpiece through reaction. Due to the high temperature oxidative corrosion environment, the thermally grown Cr 2 o 3 It has protective properties, so chromium coatings are usually developed on iron-based, nickel-based and other metals in order to form Cr during high temperature oxidation 2 o 3 protective oxide film. However, at present, the temperature of chromizing by solid powder method is usually above 1000°C. Such a high temperature seriously affects the structure and comprehensive properties of the subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C30/00C23C28/00C25D5/00C23C8/62
Inventor 彭晓张海媛王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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