Stainless steel passivating method and used mixed solution

A mixed solution and stainless steel technology, which is applied in the coating process of metal materials, etc., can solve the problems of reduced pollution, atmospheric and pickling environmental pollution, and reduced storage difficulty of sulfuric acid and solid nitrate.

Inactive Publication Date: 2014-05-28
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Abstract
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Problems solved by technology

[0005] Aiming at solving the above-mentioned problems such as serious pollution to the atmosphere and pickling environment, and difficult storage, a method for passivating stainless steel and a mixed solution used are provided. The mixed solution uses sulfuric acid and solid nitrate to passivate stainless steel, sulfuric acid and The storage difficulty of solid nitrate is reduced, and the degree of pollution is reduced. This method of passivating stainless steel makes the surface of passivated stainless steel beautiful, and can achieve the same effect as the passivation effect of pure nitric acid

Method used

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  • Stainless steel passivating method and used mixed solution
  • Stainless steel passivating method and used mixed solution
  • Stainless steel passivating method and used mixed solution

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Embodiment Construction

[0017] A flowchart of a method of passivating stainless steel according to an exemplary embodiment of the present invention will be described with reference to process drawings. In the exemplary embodiment, taking the dipping method as an example, various embodiments in which the mixed solution according to the present invention is used to passivate the stainless steel plate are described to illustrate the characteristics and other advantages of the present invention.

[0018] figure 1 Is a flowchart of a method for passivating stainless steel according to an embodiment of the present invention, figure 2 It is a schematic diagram of a passivation stainless steel process according to an embodiment of the present invention.

[0019] in figure 1 In the process of framing, alkaline washing, passivation, clean water washing, hot water washing, drying and unframing of the stainless steel plate, the treatment of stainless steel is completed. The framing is the step of fixing the stainle...

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Abstract

The invention provides a stainless steel passivating method for passivating stainless steel by adopting a mixed solution of sulfuric acid and nitrate. The mixed solution contains the sulfuric acid with the mass percent of 0.45% to 2.7% and 45g / L to 70g / L of NaNO3 or KNO3. The mixed solution is easy to store and low in pollution level, the surface of the stainless steel passivated with the stainless steel passivating method is attractive in appearance, and the effect which is the same as the effect of pure nitric acid passivation can be realized.

Description

Technical field [0001] The invention relates to a method for passivating stainless steel and a mixed solution used, in particular to a method for passivating low-nickel-chromium stainless steel and a mixed solution used in the method. Background technique [0002] Stainless steel surface cleaning, pickling and passivation not only maximize corrosion resistance, but also prevent product contamination and obtain aesthetics. [0003] Pickling passivation is an important process for anti-corrosion treatment of stainless steel. A layer of the stainless steel surface is corroded by pickling. The chemical activity of acid makes the dissolution rate of defective parts higher than other parts on the surface. Therefore, pickling can make the entire surface tend to be evenly balanced, and some of them are easy to cause corrosion. Was cleared. But more importantly, through pickling passivation, the iron and iron oxides are dissolved preferentially than the chromium and chromium oxides, and t...

Claims

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Application Information

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IPC IPC(8): C23C22/50C23G1/08
CPCC23G1/085C23C22/50
Inventor 魏育君王正虎
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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