Stainless steel surface processing method

A surface treatment, stainless steel technology, applied in the direction of metal material coating process, etc., can solve the problems of reducing stainless steel corrosion resistance, unclean removal, incomplete coverage, etc., to improve surface quality, corrosion resistance, and corrosion resistance. , the effect of simple operation

Active Publication Date: 2016-03-09
AEROSPACE PRECISION PROD INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods still inevitably lead to uneven stirring of the solution and uneven diffusion of metal ions, resulting in uneven deposition thickness of the passivation film, which greatly reduces the surface quality and corrosion resistance of the workpiece.
In addition, the scale and other impurities on the surface of stainless steel before passivation are often not removed cleanly or the passivation film is not completely covered on the surface of the workpiece during the formation process, which will reduce the corrosion resistance of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put the heat-treated stainless steel fasteners into a magnetic grinding tank filled with polishing cleaner, use a 0.5×7mm stainless steel needle as the grinding medium, and perform magnetic grinding at a working frequency of 60 Hz for 10 min. Remove the workpiece from the grinding tank and wash it twice, dry it and dry it, then put it into the pickling solution for pickling for 1min, the composition of the pickling solution is 10wt% HNO 3 and a mixed aqueous solution of 0.5wt% HF at a temperature of 25°C. After pickling, put the workpiece into 10wt% NaOH solution for alkali washing for 5 minutes. After alkali washing, rinse twice with deionized water to dry the workpiece. Put it into the passivation solution for passivation for 30min, the composition of the passivation solution is 30vt%HNO 3 and 3 wt% Na 2 Cr 2 o 7 2H 2 A mixed aqueous solution of O, the solution temperature is 50°C, after passivation, rinse the workpiece twice with deionized water, and put it into ...

Embodiment 2

[0017] Put the heat-treated stainless steel fasteners into a magnetic grinding tank filled with polishing cleaner, use a 0.5×7mm stainless steel needle as the grinding medium, and perform magnetic grinding at a working frequency of 60 Hz for 15 min. Remove the workpiece from the grinding tank and wash it twice, dry it and dry it, then put it into the pickling solution for pickling for 2 minutes, the composition of the pickling solution is 9wt% HNO 3 and a mixed aqueous solution of 1wt% HF at a temperature of 40°C. After pickling, put the workpiece into 10wt% NaOH solution for alkali washing for 5 minutes. After alkali washing, rinse twice with deionized water for drying. Into the passivation solution for passivation for 25min, the composition of the passivation solution is 25vt% HNO 3 and 3 wt% Na 2 Cr 2 o 7 2H 2 Mixed aqueous solution of O, the solution temperature is 55°C, rinse the workpiece twice with deionized water after passivation, and put it into the blocking solu...

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PUM

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Abstract

The invention provides a stainless steel surface processing method. The stainless steel surface processing method includes the processing steps of acid washing, alkali washing, passivation and sealing of stainless steel workpieces, wherein in the passivation and / or sealing process, ultrasonic processing is conducted on a passivation solution and a sealing solution at the same time. By means of the stainless steel surface processing method, the roughness of the surfaces of the stainless steel workpieces can be reduced, the metal glossiness is excellent, oxides or other impurities on the surfaces can be removed thoroughly, passivation films can cover the surfaces of the workpieces evenly and completely, and the corrosion resistance of stainless steel is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a passivation treatment method for the surface of stainless steel. Background technique [0002] With the continuous development of the industrial field, the use environment of stainless steel parts is becoming more and more harsh. For example, stainless steel parts used in marine climate environments require higher corrosion resistance. The main factors affecting the corrosion resistance of stainless steel include surface roughness, cleanliness, and passivation film quality. To improve the corrosion resistance of stainless steel surfaces, chemical treatment or electrochemical treatment methods are widely used at present, among which chromate passivation is a typical chemical passivation method. It is an oxidation-reduction reaction between stainless steel and hexavalent chromium. The passivation film is mainly composed of insoluble trivalen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/73C23C22/78C23C22/82C23C22/24
CPCC23C22/24C23C22/73C23C22/78C23C22/82
Inventor 焦莎刘燕万冰华于建政王川潘慧郑晓冬张晓玲
Owner AEROSPACE PRECISION PROD INC LTD
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