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Method for reducing embedding of sand blasting medium into electroplating steel surface

A technology of sand blasting and medium, applied in the direction of metal material coating process, etc., can solve the problems of reducing the corrosion resistance of steel workpieces and reducing the appearance quality of workpieces, so as to improve the overall performance, reduce the probability of black spot defects, and improve The effect of plating quality

Inactive Publication Date: 2015-03-11
SHENYANG AIRCRAFT CORP
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

Black spot defects not only reduce the appearance quality of workpieces but also reduce the corrosion resistance of steel workpieces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Example: A method of reducing embedding of blasting media into galvanized steel surfaces

[0035] (1) The steps are as follows:

[0036] 1) Sand blasting: (1) Turn on the air supply switch, adjust the sand blasting pressure to 0.5MPa-0.6 MPa, and after the sand particles are ejected at a uniform speed, reduce the pressure to 0.2 MPa-0.3 MPa;

[0037] (2) Adjust the distance between the sandblasting nozzle and the workpiece, and at the same time ensure the inclination angle, the distance is 200mm-300mm, and the inclination angle is 30°-60°;

[0038] (3) Use corundum sand or quartz sand to sandblast the workpiece. The walking speed of the hand-held spray gun on the surface of the workpiece: 0.5m / s-1.5m / s, and the time spent in sandblasting per unit area of ​​the workpiece is less than or equal to 2s;

[0039] 2) Activation: put the workpiece after sandblasting into strong acid solution, time: 1min-2min;

[0040] 3) Dip cyanide: place the workpiece in alkaline solution a...

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Abstract

The invention relates to a method for reducing the embedding of a sand blasting medium into an electroplating steel surface. The method comprises the following steps: regulating air pressure; performing sand blasting on a steel workpiece; activating the workpiece subjected to the sand blasting, soaking the workpiece with cyanogen, electroplating, performing bright dipping, removing hydrogen, performing secondary activation, and passivating; the surface quality of the steel workpiece is improved; the probability of black spots on the surface of the steel workpiece is reduced; the quality of the workpiece is improved.

Description

technical field [0001] The invention relates to a process method for reducing electroplating defects after sandblasting, which belongs to the process method of steel workpieces. Background technique [0002] Sand blasting is powered by clean compressed air that has been separated from oil and water, so that the dried sand particles form a high-speed sand flow and shoot to the surface of the metal part, making it hit the surface of the workpiece strongly, relying on the cutting effect of the sand particles to process the metal part. In the process of cleaning and modification, the sandblasting method is mainly used for materials and workpieces that are not easy to use conventional treatment methods. In order to clean the scale or rust on the surface of the workpiece, reduce the surface roughness of the workpiece, and increase the bonding force between the covering layer and the substrate. This technology is widely used in the pretreatment of metal surface as coating, plating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/36C25D3/04C23C22/27
CPCC25D5/36B24C1/08C23C22/27C25D3/04
Inventor 于海沙春鹏
Owner SHENYANG AIRCRAFT CORP
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