Treatment process applied before aluminum plating on threaded stainless steel parts by virtue of multi-arc ion plating and application of treatment process

A multi-arc ion, stainless steel technology, applied in ion implantation plating, metal material coating process, sputtering plating and other directions, can solve the problems of insufficient surface brightness, low yield, screw black spots, etc., to improve the surface brightness , The effect of improving the yield and meeting the requirements of lubricity and electrical conductivity

Inactive Publication Date: 2015-05-20
SHENYANG FORTUNE PRECISION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above-mentioned technical problems, in order to solve the problem that there are a large number of black spot defects on the surface of the screw after the pure aluminum plating of the threaded stainless steel part, and the surface brightness is not enough, resulting in a low yield, the purpose of the present invention is to provide a threaded stainless steel part Multi-arc ion plating aluminum pretreatment process and its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: The multi-arc ion plating aluminum pretreatment process for threaded stainless steel parts of the present invention, taking screws as an example, includes the following steps:

[0025] (1) Dry and clean the stainless steel screws before sandblasting, degrease and clean the screws to remove surface oil, and use compressed air to dry the surface of the parts;

[0026] (2) Manually sandblast the screws treated in (1); use white corundum (Al 2 o 3 ), the sand material model range is 36#; the sandblasting pressure is 40PSI (0.276MPa);

[0027] (3) After sandblasting the stainless steel screws, perform ultrasonic hot water washing, and then use compressed air to dry the surface of the parts. The cleaning time is 3 minutes and the temperature is 40°C;

[0028] (4) After drying (3), hang the screw with a titanium wire, put it into the electropolishing tank, and immediately turn on the power for electropolishing. The electropolishing solution is Isopol 140 electr...

Embodiment 2

[0031] Example 2: The difference between this example and Example 1 is that in this example, a passivation treatment process is added after the (4) electrolytic polishing process, which is to put stainless steel screws into HNO with a volume fraction of 50% 3 Passivation treatment in the passivation tank for 30min.

[0032] In this example, white corundum (Al 2 o 3 ), the sand material model range is 150#; the sandblasting pressure is 60PSI;

[0033] Ultrasonic hot water washing time is 4min, the temperature is 45°C;

[0034] Electrolytic polishing 70s, current density controlled at 6A / dm 2 ;Use titanium wire as the cathode, the area of ​​the plate is 1 / 4 of the part area; temperature: 60°C, voltage: 10V, electric throwing time: 1min;

[0035] The passivation treatment is HNO with a volume fraction of 50% 3 Medium passivation treatment for 30 minutes;

[0036] After the passivation is completed, put the stainless steel screws in hot water at 40°C for 4 minutes and then d...

Embodiment 3

[0037] Embodiment 3: The difference between this example and Example 2 is: in this example, white corundum (Al 2 o 3 ), the sand material model range is 240#; the sandblasting pressure is 80PSI (0.552 MPa);

[0038] Ultrasonic hot water washing time is 5min, the temperature is 50℃;

[0039] Electrolytic polishing for 120s, current density controlled at 7A / dm 2 ;Using titanium wire as the cathode, the plate area is 1 / 3 of the part area; temperature: 70°C, voltage: 12V, electropolishing time: 2min;

[0040] The passivation treatment is HNO with a volume fraction of 50% 3 Medium passivation treatment for 30 minutes;

[0041] After the passivation is completed, wash the stainless steel screws in hot water at 42°C for 5 minutes and then dry them.

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Abstract

The invention discloses a treatment process applied before aluminum plating on threaded stainless steel parts by virtue of multi-arc ion plating, and belongs to the technical field of stainless steel process treatment. The process comprises the following steps: carrying out drying and cleaning treatment before sand blasting on stainless steel screws; carrying out manual sand blasting treatment on the processed screws; washing the screws with hot water through ultrasonic wave and blow-drying the surfaces of the parts; implementing electrolytic polishing under constant voltage for 30-120s and controlling current density at 5-7A/dm<2>; implementing passivating treatment; and cleaning the parts in hot water at 38-42 DEG C for 2min and blow-drying the parts. By virtue of manual sand blasting and electrolytic polishing, the treatment process disclosed by the invention can be used for not only improving the surface brightness of the aluminum-plated screws, but also significantly reducing the dark-point defect, so as to remarkably improve the product rate and meet the requirements of the aluminum-plated screws on lubricating and conducting properties during using.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a multi-arc ion plating aluminum pretreatment process for threaded stainless steel parts and its application. It is suitable for the pretreatment process of pure aluminum plating on stainless steel screws in IC equipment (special production equipment for semiconductor devices, integrated circuit chips and flat panel displays), and is a professional technology before multi-arc ion plating of stainless steel screws. Background technique [0002] At present, multi-arc ion plating is used to plate pure aluminum on the surface of stainless steel. Although it has been widely used in IC equipment, there are a large number of black spots on the surface of screws after plating pure aluminum, and the surface brightness is low, resulting in low yield and cannot meet the requirements of plating. The lubricity and conductivity requirements of aluminum screws during use....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/02C23C14/32C23C14/14
Inventor 刘欢侯涛郭文鹏
Owner SHENYANG FORTUNE PRECISION EQUIP CO LTD
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