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A treatment method for stainless steel surface blackening

A treatment method and surface blackening technology, applied in chromate treatment, metal material coating process, etc., can solve the problems of poor comprehensive performance, improve wear resistance and corrosion resistance, avoid chemical coloring bluish, Effects suitable for promotional use

Active Publication Date: 2019-08-06
ANHUI BAOHENG ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Stainless steel has the characteristics of high hardness, good wear resistance, good corrosion resistance, excellent appearance and long life. It is widely used in construction, automobile industry, shipbuilding industry, marine equipment, mechanical equipment and chemical equipment and other industries. Stainless steel is blackened Make the workpiece matte, no hanging dust, good wear resistance, and can expand the scope of application of stainless steel plates. Now it mainly consists of low-temperature blackening, optical extinction blackening and high-temperature blackening, but its comprehensive performance is poor, and further research is needed. Research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Select a 304 stainless steel plate with a thickness of 0.8mm for the following treatment, and use a blackening coloring solution to treat the surface of the stainless steel, specifically including the following steps:

[0015] (1) After the stainless steel is mechanically polished to obtain a plate with a roughness Ra of 0.2, it is subjected to electrolytic treatment. The treatment conditions are: temperature 65°C, current density 0.2A / dm², and duration 30 minutes;

[0016] (2) Place the stainless steel after the above treatment in the coloring solution at room temperature for coloring, use ultrasonic radiation during the coloring process, the treatment conditions are: frequency 7MHz, sound intensity 26kW / ㎡; Hardening solution of chromium, 40g / L zirconia and 50g / L sulfuric acid to harden the film;

[0017] Among them, the coloring liquid contains the following components: chromic anhydride 220g / L, ferrous ammonium sulfate 100g / L, sulfuric acid 350g / L, manganese sulfate ...

Embodiment 2

[0022] Select a 304 stainless steel plate with a thickness of 0.8mm for the following treatment, and use a blackening coloring solution to treat the surface of the stainless steel, specifically including the following steps:

[0023] (1) After the stainless steel is mechanically polished to obtain a plate with a roughness Ra of 0.2, it is subjected to electrolytic treatment. The treatment conditions are: temperature 70°C, current density 0.4A / dm², and duration 30 minutes;

[0024] (2) Place the above-mentioned treated stainless steel in the coloring solution at room temperature for coloring, use ultrasonic radiation during the coloring process, the treatment conditions are: frequency 6.5MHz, sound intensity 22kW / ㎡; after coloring, add 180g / L Harden the film with chromium oxide, 40g / L zirconia and 50g / L sulfuric acid;

[0025] Among them, the coloring liquid contains the following components: chromic anhydride 240g / L, ferrous ammonium sulfate 8g / L, sulfuric acid 350g / L, mangane...

Embodiment 3

[0030] Select a 304 stainless steel plate with a thickness of 0.8mm for the following treatment, and use a blackening coloring solution to treat the surface of the stainless steel, specifically including the following steps:

[0031] (1) After the stainless steel is mechanically polished to obtain a plate with a roughness Ra of 0.2, it is subjected to electrolytic treatment. The treatment conditions are: temperature 65-70°C, current density 0.2-0.4A / dm², and duration 30 minutes;

[0032] (2) Put the stainless steel after the above treatment in the coloring solution at room temperature for coloring, use ultrasonic radiation during the coloring process, the treatment conditions are: frequency 8MHz, sound intensity 28kW / ㎡; Hardening solution of chromium, 40g / L zirconia and 50g / L sulfuric acid to harden the film;

[0033] Among them, the coloring liquid contains the following components: chromic anhydride 240g / L, ferrous ammonium sulfate 90g / L, sulfuric acid 400g / L, manganese sulf...

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Abstract

The invention belongs to the technical field of processing of stainless steel surfaces and particularly relates to a blackening treatment method for a stainless steel surface. The blackening treatment method for the stainless steel surface comprises the steps of polishing, electrolytic activation, normal-temperature coloring, film hardening, and hot-air drying. Compared with the prior art, the blackening treatment method for the stainless steel surface has the following advantages that through electrolytic activation, a coloring agent forms a layer of compact alloy oxide film on the stainless steel surface, and the problem of that the stainless steel surface is bluish when chemical coloring is adopted is effectively solved; the treatment method is simple and easy to control, a formed black stainless steel film is uniform and bright, obvious color differences are avoided, and both the abrasion resistance and the corrosion resistance are obviously improved; and cracks can be avoided when the variable cumulant of cold workability reaches 80% or over, and the blackening method is suitable for application and popularization.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a treatment method for stainless steel surface blackening. Background technique [0002] Stainless steel has the characteristics of high hardness, good wear resistance, good corrosion resistance, excellent appearance and long life. It is widely used in construction, automobile industry, shipbuilding industry, marine equipment, mechanical equipment and chemical equipment and other industries. Stainless steel is blackened Make the workpiece matte, no hanging dust, good wear resistance, and can expand the scope of application of stainless steel plates. Now it mainly consists of low-temperature blackening, optical extinction blackening and high-temperature blackening, but its comprehensive performance is poor, and further research is needed. Research. Contents of the invention [0003] The object of the present invention is to provide a treatm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/43C23C22/78C23C22/82C25F1/06C25D11/38
CPCC23C22/43C23C22/78C23C22/82C25D11/38C25F1/06
Inventor 洪功正潘永刚蔡永波
Owner ANHUI BAOHENG ADVANCED MATERIAL TECH CO LTD
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