Surface treatment process for stainless steel

A surface treatment, stainless steel technology, applied in the direction of metal material coating process, etc., can solve the problems of high grinding labor intensity, inconsistent polishing patterns and high cost, and achieve the effect of improving the quality of inner and outer surfaces, uniform surface color, and prolonging service life.

Inactive Publication Date: 2017-05-31
LUZHOU NORTH CHEM IND
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface treatment of stainless steel equipment generally adopts pickling paste pickling passivation and surface polishing treatment: but the pickling paste is used for surface pickling passivation, which can only remove surface oil stains, etc. The surface color of stainless steel is inconsistent and the appearance quality is poor; while mechanical polishing is used , there are generally two forms of manual polishing and machine polishing, but there are grinding labor intensity, long time, low efficiency, high cost, and the polishing time of a piece of equipment is longer than the manufacturing time, the internal welds of small equipment cannot be polished, and the polishing lines inconsistent

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Surface treatment process for stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Surface treatment of injector equipment

[0028] A. Pretreatment:

[0029] (1) Grind the surface first to remove welding slag and spatter;

[0030] (2) Then use pickling paste to remove oil stains and oxides on the surface and welds;

[0031] (3) Finally, use clean water to remove internal and external impurities;

[0032] B. Immerse the stainless steel in the pickling passivation solution, including the following components in volume percentage: 30% nitric acid, 7% hydrofluoric acid, and the rest are water, wherein nitric acid is calculated by 100% concentration, and hydrofluoric acid is calculated by 100% concentration. Soak for 150min until a silver-white passivation film is formed on the surface with uniform color;

[0033] C. Then immerse the injector equipment in the neutralizing liquid NaOH with a concentration of 10-20%;

[0034] D. Soak in clean water to remove the solution and impurities attached to the surface, dry, and then pack for protection....

Embodiment 2

[0036] Embodiment 2 Surface treatment of steel pipe parts

[0037] A. Pretreatment:

[0038] (1) Grind the surface first to remove welding slag and spatter;

[0039] (2) Then use pickling paste to remove oil stains and oxides on the surface and welds;

[0040] (3) Finally, use clean water to remove internal and external impurities;

[0041] B. Immerse the stainless steel in the pickling passivation solution, including the following components in volume percentage: 30% nitric acid, 7% hydrofluoric acid, and the rest are water, wherein nitric acid is calculated by 100% concentration, and hydrofluoric acid is calculated by 100% concentration. Soak for 120min until a silver-white passivation film is formed on the surface with uniform color;

[0042] C. Then immerse the steel pipe in 10-20% neutralizing solution NaOH;

[0043] D. Soak in clean water to remove the solution and impurities attached to the surface, dry, and then pack for protection.

[0044] The surface color of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention belongs to the surface treatment field and particularly relates to a surface treatment process for stainless steel. According to the surface treatment process, the surface quality of stainless steel equipment can be improved. The surface treatment process comprises the following steps: (A) pretreatment: firstly polishing the stainless steel surface, removing welding slag and spatter, removing oil stain and oxides on the surface and in a weld joint by virtue of acid pickling paste, and finally, removing internal and external impurities with clean water; (B) dipping the stainless steel into acid pickling passivation liquid until a silver white passivation film is formed on the surface and the color is uniform; (C) dipping the stainless steel into neutralizing liquid; and (D) soaking the stainless steel with clean water so as to remove surface-adhering solutions and impurities, and drying. The surface treatment process has the advantages that the surface color of the stainless steel is uniform and good in consistency, the surface quality of the stainless steel is high, furthermore, the service life of equipment or a part can be prolonged, the cost is low, the efficiency is high, and the like.

Description

technical field [0001] The invention belongs to the field of surface treatment, and in particular relates to a stainless steel surface treatment process. Background technique [0002] The surface quality of stainless steel equipment directly determines the product quality, how to improve its surface quality has always been a difficult problem in this field. The surface treatment of stainless steel equipment generally adopts pickling paste pickling passivation and surface polishing treatment: but the pickling paste is used for surface pickling passivation, which can only remove surface oil stains, etc. The surface color of stainless steel is inconsistent and the appearance quality is poor; while mechanical polishing is used , there are generally two forms of manual polishing and machine polishing, but there are grinding labor intensity, long time, low efficiency, high cost, and the polishing time of a piece of equipment is longer than the manufacturing time, the internal weld...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/73C23C22/50C23G1/08C23C22/78C23C22/83
CPCC23C22/73C23C22/50C23C22/78C23C22/83C23G1/086
Inventor 高冀平唐晏兵吴兴华黄程何军邓玉春袁知文邱胜勇
Owner LUZHOU NORTH CHEM IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap