Process for spraying and coating bronze at steel and iron surface using oxygen-acetylene subsonic flame

A technology of steel surface and process method, applied in the direction of metal material coating process, coating, melting spray plating, etc., can solve the problems of changing the original composition of the bronze alloy layer, reducing the performance of the bronze alloy coating, etc., to achieve the quality of the spray layer Good, low-cost, easy-to-use results

Inactive Publication Date: 2008-05-28
SHANDONG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The second is to add a surfactant to the bronze alloy to modify it to form a low-nickel (or nickel-free), low-boron, and silicon-free bronze-based alloy powder, and then spray it. This method changes the quality of the bronze alloy. The origin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] For shaft steel castings (pistons) with a diameter of 100mm and a length of 450mm, the process steps of using oxygen-acetylene subsonic flame to spray bronze alloy on the surface of the cast steel are as follows:

[0024] (1) Use diamond or silica sand with a particle size of 15-30 meshes to sandblast the cast steel surface to make the cast steel surface clean and gray; use a manual grinding wheel to polish until the surface reveals a metallic luster;

[0025] (2) Use oxygen-acetylene flame to preheat the surface of steel castings at low temperature, the preheating temperature is 60℃~120℃;

[0026] (3) Using an oxygen-acetylene subsonic spray gun, flame spray nickel-clad aluminum alloy powder on the surface of the preheated steel castings (the particle size of the nickel-clad aluminum composite powder is not less than 300 mesh, and its composition is calculated by weight percentage: Ni 80% ~83%, Al 17%~20%) as the primer layer, spraying process parameters...

Example Embodiment

[0031] Example 2

[0032] Aiming at the ductile iron ring parts with an outer diameter of 500mm, an inner diameter of 250mm, and a thickness of 30mm, the process steps of using oxygen-acetylene subsonic flame spraying aluminum bronze alloy to make the airlock valve are as follows:

[0033] (1) Use diamond or silica sand with a particle size of 15-40 mesh to blast the surface of the ring part of ductile iron, and then use a manual grinding wheel to polish it until the surface of ductile iron shows metallic luster;

[0034] (2) Use oxygen-acetylene flame to preheat the surface of ductile iron at low temperature, the preheating temperature is 80℃~150℃;

[0035] (3) Using an oxygen-acetylene subsonic spray gun, flame spray nickel-clad aluminum alloy powder on the surface of the preheated ductile iron (the particle size of the nickel-clad aluminum composite powder is not less than 300 mesh, and its composition is calculated by weight percentage: Ni 83% , Al 17%) as the bottom layer, th...

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Abstract

The invention discloses a technique process which utilizes oxygen-acetylene subsonic flame to spray bronze alloy on steel surface, belonging to the technical field of the spraying of material surface. Firstly, the surface of a steel member is proceeded the treatment of deoiling, derusting and surface roughening, the surface of the steel member is preheated by the oxygen-acetylene subsonic flame, the oxygen-acetylene is employed as combustion flame, compressed air is utilized as powder-feeding air and speed up air, and atomizing particle flow is high-speed sprayed to the member surface by a subsonic spray gun and a compress-swelling spraying nozzle with the structure of spiral gas mixing and spraying-absorbing air inletting. The surface of steel member is firstly sprayed with nickel coated aluminum composite powder which is used to be base coat, then the base coat is sprayed with aluminum bronze layer, and hole-seal treatment is instantly proceeded after being sprayed. The invention has the advantages of high spraying efficiency, high binding intensity of an interface, perfect corrosion resistance, simple operation, beautiful formation of the appearance, low cost, easy popularization and application, and the like. In addition, the technique is in particular adaptable for spraying the surfaces of outdoor large-scale formations or statues.

Description

1. Technical field [0001] The invention relates to a method for spraying bronze, in particular to a method for spraying bronze on a steel surface with an oxygen-acetylene subsonic flame, and belongs to the technical field of surface spraying of material science and engineering. 2. Technical background [0002] Material surface cladding methods (such as surfacing, brush plating, spraying, etc.) and their combined processes are often limited by the size of the parts, structural form and use environment. For example, large iron castings with complex structures are difficult to use surfacing welding or brush plating methods for surface treatment. In recent years, with the development and application of spraying technology, the technology of preparing coatings on material substrates has been widely used. Among them, oxy-acetylene flame spraying has attracted attention because of its low cost, high spraying efficiency, easy operation and wide application range. This technology h...

Claims

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Application Information

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IPC IPC(8): C23C4/08C23C4/12C23C4/18C23C4/02C23C4/129
Inventor 李亚江王娟夏春智张永兰
Owner SHANDONG UNIV
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