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Corrosion-resistant colored film of austenite thin-wall stainless steel pipe and preparation method of corrosion-resistant colored film

A stainless steel pipe and austenitic technology, which is applied in the field of corrosion-resistant coloring film and its preparation for austenitic thin-walled stainless steel pipes, can solve the problem of unsatisfactory color uniformity and reproducibility, poor abrasion resistance and aging resistance, Can not achieve the same life of the base material and other problems, to achieve good environmental protection benefits, good decorative effect, not easy to age and fall off

Inactive Publication Date: 2015-05-06
SHENZHEN MINLE PIPE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of corrosion-resistant colored film is simply coated or deposited on the surface of stainless steel substrates by physical methods, and its abrasion resistance and aging resistance are poor. After a few years, the corrosion-resistant film will gradually fall off and degrade, and it cannot Realize the long-term requirement of the same lifespan as the base material, and it is not environmentally friendly
The acidic chemical coloring method adopted abroad, that is, the famous INCO method, can form a stable corrosion-resistant coloring film on the surface of stainless steel, and has achieved industrial application, but the uniformity and reproducibility of the color are still not ideal, and further improvement is needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Pretreatment: Clean the surface of 304 thin-walled stainless steel pipe (DN15), put it in lye and treat it at 90°C for 25 minutes to remove the surface oil, and clean the stainless steel pipe with clean water again. The lye used here is Contains 60 g / L NaOH, 20 g / L Na 2 CO 3 and 40 g / L Na 3 PO 4 mixed aqueous solution;

[0042] (2) Pickling: Put the cleaned stainless steel tube into the solution containing 220 g / L HNO 3 and 50 g / L HF pickling solution, soak at 65°C for 10 minutes, and clean the stainless steel tube after completion;

[0043] (3) Passivation: put the acid-washed stainless steel tube into HNO with a concentration of 250g / L at room temperature 3 Medium passivation treatment for 20 minutes, after the passivation layer on the surface of the pipe is completely formed, take out the stainless steel pipe and clean it with clean water;

[0044] (4) Coloring: put the passivated stainless steel tube into the chemical coloring solution for coloring, the co...

Embodiment 2

[0049] (1) Pre-treatment: Clean the surface of 304 thin-walled stainless steel pipe (DN50) after preliminary mechanical polishing, put it in lye and treat it at 90°C for 25 minutes to remove surface oil, and clean the stainless steel pipe with clean water again. The lye used here contains 60 g / L NaOH, 20 g / L NaOH 2 CO 3 and 40 g / L Na 3 PO 4 mixed aqueous solution;

[0050] (2) One-step pickling and passivation treatment: put the cleaned steel pipe into the pickling and passivation two-in-one mixed treatment solution and soak for 20 minutes. After the passivation layer on the surface of the pipe is completely formed, take out the pipe and clean it with hot water , the mixed treatment solution used here is 300 g / L HNO 3 , 25 g / L HF, 60 g / L HCl and 1 g / L hexamethylenetetramine, the temperature is room temperature;

[0051] (3) Coloring: Put the stainless steel tube after one-step pickling and passivation treatment into the chemical coloring solution for coloring, the colorin...

Embodiment 3

[0056] (1) Pre-treatment: Clean the surface of the austenitic thin-walled stainless steel pipe, put it in lye and treat it at 90°C for 25 minutes to remove the surface oil, and clean the stainless steel pipe with clean water again. The lye used here contains 60 g / L NaOH, 20 g / L NaOH 2 CO 3 and 40 g / L Na 3 PO 4 mixed aqueous solution;

[0057] (2) Pickling: Put the cleaned stainless steel tube into the solution containing 220 g / L H 2 SO 4 and 100 g / L HCl pickling solution, soak for 15 minutes at 20 ° C, and clean the stainless steel tube after completion;

[0058] (3) Passivation: put the pickled stainless steel tube into the solution containing 220g / L HNO at room temperature 3 and 30g / L sodium dichromate passivation solution for 30 minutes, after the passivation layer on the surface of the pipe is completely formed, take out the stainless steel pipe and clean it with clean water;

[0059] (4) Coloring: put the passivated stainless steel tube into the chemical coloring s...

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PUM

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Abstract

The invention discloses a corrosion-resistant colored film of an austenite thin-wall stainless steel pipe. A colored layer of the corrosion-resistant colored film of the austenite thin-wall stainless steel pipe is coated on a passivation layer and has a structure with two or more layers; the passivation layer is directly connected with the surface of an austenite thin-wall stainless steel pipe substrate material; and the color of the colored layer is changed along with the thickness change of the colored layer. The invention also discloses a method for preparing the corrosion-resistant colored film of the austenite thin-wall stainless steel pipe, and the method comprises the steps of pretreatment, acid cleaning, passivation, coloring, film fixing and sealing. The corrosion-resistant colored film of the austenite thin-wall stainless steel pipe not only has relatively strong corrosion resistance, wear resistance and stain resistance, but also is varied in color, uniform and bright in color and luster, difficult to change color and good in color reproducibility; and meanwhile, the method for preparing the corrosion-resistant colored film of the austenite thin-wall stainless steel pipe is simple in process and easy to operate.

Description

technical field [0001] The invention relates to a stainless steel pipe coloring film, in particular to an austenitic thin-walled stainless steel pipe corrosion-resistant coloring film and a preparation method thereof. Background technique [0002] Since the 1990s, stainless steel has developed rapidly in my country, and stainless steel pipes have been widely used in petroleum, chemical, medical, light industry, food, mechanical instruments and other fields. However, because stainless steel pipelines are poor in corrosion resistance to Cl ions, in coastal areas, the corrosion resistance of the base material can only be improved to cope with environmental corrosion, and the color of the stainless steel base material is silvery white, which is relatively simple, which hinders its corrosion resistance. The application of decorative requirements has led to the fact that stainless steel pipes have not been widely used in China at present. In order to expand the application range ...

Claims

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Application Information

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IPC IPC(8): C23C22/84C23C28/04
CPCC23C22/84
Inventor 黄兴涛
Owner SHENZHEN MINLE PIPE IND
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