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Metal surface pretreatment method

A processing method and technology for metal surface, applied in the direction of metal material coating process, melt spraying, coating, etc., can solve the problems of long sand blasting treatment time, consumption of sand grains, increase labor intensity, etc., and achieve rough surface. The effect of small degree, improved bonding strength and high work efficiency

Inactive Publication Date: 2019-02-12
GUANGDONG INST OF NEW MATERIALS
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

Very inconvenient for larger and heavier workpieces
[0005] (3) If the workpiece that needs to be sand blasted is relatively large, more sand particles will be consumed, and the time for sand blasting will be longer, which will increase the labor intensity and the cost will be higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of sand grains: the sand grains used are brown corundum sand commonly used in sand blowing treatment, and are loaded into a powder feeder after drying. The sand grain size is 180#.

[0026] (2) Pre-spraying treatment: The metal surface to be sprayed should be properly degreased, such as wiping with acetone.

[0027] (3) Sand blowing treatment: ignite according to the program, start the Intelli-Jet supersonic flame spraying equipment, adjust the flame temperature to make it lower than the melting point of sand grains, and control the temperature at about 1400°C. The parameters used are compressed air 85PSI, main gas 85PSI, Secondary gas 58PSI. Start the powder feeder, and control the sand flow rate at about 120 g / min. Use the manipulator to keep the distance between the spray gun and the metal surface of the metal workpiece at a distance of 150mm-400mm, start the workpiece rotation mechanism to rotate the workpiece, start the manipulator, and start movi...

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Abstract

A metal surface pretreatment method comprises the following steps that after a metal surface of a metal workpiece is subjected to degreasing treatment, supersonic flame spraying equipment is used forconducting sandblasting roughening treatment, thus, the metal surface is uniformly roughed, and then the metal surface is sprayed with a coating, wherein a sandblasting roughening treatment method comprises the steps that ignition is conducted according to procedures of the supersonic flame spraying equipment, the flame temperature is adjusted to be lower than the melting point of sand, a powder feeder with sand is started, thus, a spraying gun is kept away from the metal surface of the metal workpiece by a certain distance, then the metal workpiece is driven to rotate, and the spray gun is moved relative to the metal surface at a certain speed for spraying. By ingeniously using the supersonic flame spraying equipment for conducting the sandblasting roughening treatment, oxide skins and other foreign matter on the metal surface are quickly removed, hot sand achieves a good preheating effect during sandblasting, time is further saved, and cost is further reduced. Moreover, the roughnessof the treated metal surface is quite uniform, and damage to the metal surface is slight.

Description

technical field [0001] The invention relates to the technical field of metal spraying, in particular to a method for performing metal surface pretreatment by using supersonic flame spraying technology. Background technique [0002] The preparation of coatings by thermal spraying technology generally requires degreasing, surface roughening and preheating of the metal surface before spraying the coating. The commonly used surface roughening method is sand blasting, that is, using compressed air at a certain pressure to spray alumina sand, iron sand, silicon carbide sand or other sand particles of a certain size on the surface of the substrate to remove scale, rust spots or other foreign matter on the surface of the substrate. , forming a surface with a certain roughness, so as to form a good mechanical bond with the coating deposited by thermal spraying, and improve the bonding strength of the thermal spraying coating and the substrate. This sand blasting process is generally...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/02C23C4/129
CPCC23C4/02C23C4/129
Inventor 邝子奇宋进兵张忠诚王枫倪伟帮
Owner GUANGDONG INST OF NEW MATERIALS
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