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Passivation process for stainless steel workpiece

A technology of stainless steel and workpiece, applied in the field of stainless steel, can solve the problems of harming the safety of environmental operators, unable to meet the requirements of non-toxic and harmless, etc., and achieve the effects of good passivation effect, easy operation and low production cost.

Pending Publication Date: 2020-11-06
阴通明
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Problems solved by technology

[0004] At present, most stainless steel industries at home and abroad still use the traditional chemical passivation process. The passivation solution contains heavy pollutants such as dichromate ions, nitric acid, hydrochloric acid, sulfuric acid, and hydrofluoric acid, which seriously endanger the environment and the health of operators. Meet the technical requirements of green cleaning such as non-toxic and harmless

Method used

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  • Passivation process for stainless steel workpiece

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Embodiment 1

[0029] refer to figure 1 As shown, the present embodiment provides a stainless steel workpiece passivation process, comprising the following steps:

[0030] A. Soaking in degreasing solution:

[0031] Soak the stainless steel workpiece in alkaline degreasing solution for 3-5 minutes to remove the oil stain on the surface of the stainless steel workpiece.

[0032] Wherein, the alkaline degreasing solution is a solution containing 2-4 g / l of sodium hydroxide.

[0033] B. The first cleaning:

[0034] Take out the stainless steel workpiece from the alkaline degreasing solution, and clean the stainless steel workpiece with ionized water.

[0035] C. The second cleaning:

[0036] Use clean water to rinse the ionized water on the surface of the stainless steel workpiece after cleaning with ionized water.

[0037] D. First drying:

[0038] The stainless steel workpiece is dried to remove the moisture on the surface of the stainless steel workpiece.

[0039] E. Polishing:

[00...

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Abstract

A passivation process for a stainless steel workpieces comprises the following steps: soaking in degreasing liquid: soaking the stainless steel workpiece in the alkaline degreasing liquid to remove oil stains on the surface of the stainless steel workpiece; first-time cleaning: taking out the stainless steel workpiece from the alkaline degreasing liquid, and cleaning the stainless steel workpieceby using ionic water; second-time cleaning: flushing away the ionic water on the surface of the stainless steel workpiece by using clear water; first-time drying: drying the stainless steel workpieceto remove water on the surface of the stainless steel workpiece; polishing: polishing the surface of the stainless steel workpiece; pickling: placing the stainless steel workpiece into pickling liquidfor pickling; third-time cleaning: flushing away the pickling liquid on the surface of the stainless steel workpiece by clear water; second-time drying: drying the stainless steel workpiece to removewater on the surface of the stainless steel workpiece; passivation: putting the stainless steel workpiece into passivation liquid for passivation treatment; and fourth-time cleaning, flushing away the passivation liquid on the surface of the stainless steel workpiece by clear water.

Description

technical field [0001] The invention relates to the technical field of stainless steel, in particular to a passivation process for stainless steel workpieces. Background technique [0002] During the processing of stainless steel, black and yellow oxide scales will appear. In order to improve the appearance and corrosion resistance of stainless steel, the processed stainless steel must be pickled and passivated. Remove the oxide scale produced after welding and high-temperature processing to make it silvery and shiny, and form an oxide film with chromium as the main substance on the treated surface, so that secondary oxygen corrosion will not occur again, and the purpose of passivation is achieved , so as to improve the surface anti-corrosion quality of stainless steel products and prolong the service life of equipment. [0003] Stainless steel equipment or components will cause surface oil, rust, non-metallic dirt, low melting point metal pollutants, paint, welding slag an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78C23C22/05C23G1/19C23G1/08C23G1/04
CPCC23C22/78C23C22/05C23G1/19C23G1/088C23G1/04
Inventor 阴通明
Owner 阴通明
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