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Stainless steel passivation process

A stainless steel and process technology, applied in the field of stainless steel passivation process, can solve problems such as not suitable for wide application, high passivation conditions, time-consuming, etc., and achieve the effects of improving corrosion resistance, saving time and improving work efficiency

Inactive Publication Date: 2010-07-28
SICHUAN GUANGHAN HUAWEI ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the passivation process of stainless steel workpieces, it still takes too much time, and the passivation conditions are too high, which is not suitable for wide application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Due to the change of the shape of the outer surface of the workpiece, or the impact and cutting action of the abrasive on the surface of the workpiece, the surface of the workpiece can obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the surface of the workpiece can be improved, thus improving the quality of the workpiece. Excellent fatigue resistance, increases the adhesion between it and the coating, prolongs the durability of the coating film, and is also conducive to the leveling and decoration of the coating. The purpose of pickling the surface of stainless steel is to meet the special cleaning requirements of the workpiece. Before pickling, the workpiece must be degreased. After pickling, the appearance of the equipment is qualified if it has a metallic luster. After pickling, the workpiece must be passivated to form a passivation film on the surface of the workpiece to prevent equipment from rusting.

[0027] A ...

Embodiment 2

[0031] Due to the change of the shape of the outer surface of the workpiece, or the impact and cutting action of the abrasive on the surface of the workpiece, the surface of the workpiece can obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the surface of the workpiece can be improved, thus improving the quality of the workpiece. Excellent fatigue resistance, increases the adhesion between it and the coating, prolongs the durability of the coating film, and is also conducive to the leveling and decoration of the coating. The purpose of pickling the surface of stainless steel is to meet the special cleaning requirements of the workpiece. Before pickling, the workpiece must be degreased. After pickling, the appearance of the equipment is qualified if it has a metallic luster. After pickling, the workpiece must be passivated to form a passivation film on the surface of the workpiece to prevent equipment from rusting.

[0032] A ...

Embodiment 3

[0036] Due to the change of the shape of the outer surface of the workpiece, or the impact and cutting action of the abrasive on the surface of the workpiece, the surface of the workpiece can obtain a certain degree of cleanliness and different roughness, so that the mechanical properties of the surface of the workpiece can be improved, thus improving the quality of the workpiece. Excellent fatigue resistance, increases the adhesion between it and the coating, prolongs the durability of the coating film, and is also conducive to the leveling and decoration of the coating. The purpose of pickling the surface of stainless steel is to meet the special cleaning requirements of the workpiece. Before pickling, the workpiece must be degreased. After pickling, the appearance of the equipment is qualified if it has a metallic luster. After pickling, the workpiece must be passivated to form a passivation film on the surface of the workpiece to prevent equipment from rusting.

[0037] A ...

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PUM

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Abstract

The invention relates to a surface treatment process for stainless steel, in particular to a stainless steel passivation process. The process comprises the following steps of: dipping a stainless steel workpiece in an alkali degreasing solution for 10-30 seconds under a normal temperature condition; washing the workpiece by using water at the normal temperature; acid washing: acid washing the workpiece for 50-60 seconds by using a nitric acid solution at the normal temperature; washing the workpiece by using water at the normal temperature; soaking the workpiece in a passivation solution for 40-50 seconds at the normal temperature, wherein the passivation solution contains nitric acid and sodium dichromate; washing the workpiece by using water at the normal temperature; heating purified water to be higher than 75 DEG C, and putting and soaking the passivated and cleaned workpiece into the purified water for 4-5 seconds; taking out the workpiece and airing. The invention greatly saves the time for passivating the stainless steel workpiece, reduces the production requirements of the workpiece and ensures that the process is more suitable for practical production.

Description

Technical field: [0001] The invention relates to a surface treatment process for stainless steel, in particular to a passivation process for stainless steel. Background technique: [0002] After machining, welding and other processes of stainless steel products, there will be a lot of scratches and polishing marks on the surface, and the stainless steel parts will bring oil, rust and non-metallic dirt during the process of forming, assembling, welding, weld inspection and construction marking. material, paint, welding slag and spatter, etc., and a large amount of grinding dust or dissimilar metal particles of other metal elements adhere to the surface. These substances will affect the surface quality of stainless steel parts and reduce the corrosion resistance of stainless steel (including pitting corrosion, crevice corrosion) , and even lead to stress corrosion cracking and poor surface quality of parts. Therefore, pickling passivation is generally used to remove scratches...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/24C23G1/08C23G1/19
Inventor 朱子明张学军夏波江敏
Owner SICHUAN GUANGHAN HUAWEI ALUMINUM
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