Phosphorus-free, nitrogen-free and chromium-free stainless steel passivation solution

A technology of stainless steel and passivation solution, which is applied in the coating process of metal materials, etc., can solve the problems of endangering the physical safety of workers in the environment, and cannot meet the requirements of non-toxic and harmless, and achieves strong compactness, good film-forming effect, and stable system Effect

Active Publication Date: 2020-07-24
深圳市钝化技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The passivation solution contains heavy pollutants such as dichromate ions and nitric acid, which seriously endanger the environment and the safety of operators, and cannot meet the technical requirements of non-toxic and harmless green cleaning.

Method used

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  • Phosphorus-free, nitrogen-free and chromium-free stainless steel passivation solution

Examples

Experimental program
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Effect test

preparation example Construction

[0056] The second aspect of the present invention provides a preparation method according to the phosphorus- and nitrogen-free chromium-free stainless steel passivation solution, which at least includes the following steps: adding each component to the reactor, mixing and stirring uniformly, and adding a pH regulator It is obtained after adjusting the pH.

[0057] In a preferred embodiment, the preparation method of the phosphorus- and nitrogen-free chromium-free stainless steel passivation solution includes at least the following steps: adding each component to the reactor, mixing and stirring uniformly, adding a pH regulator to adjust It is obtained after pH is 2~3.5.

[0058]

[0059] The pH adjusting agent of the present invention includes an acidic pH adjusting agent and an alkaline pH adjusting agent.

[0060] In a preferred embodiment, the acidic pH adjuster is selected from one or more combinations of hydrofluoric acid, dilute sulfuric acid, hydrochloric acid, and citric aci...

Embodiment 1

[0067] Embodiment 1 of the present invention provides a phosphorus-free, nitrogen-free, chromium-free stainless steel passivation solution. In terms of mass percentage, the preparation raw materials include at least 2% oxidant, 2% film-forming agent, 3% complexing agent, 0.05% penetrant, and 0.6% The film fixing agent and the balance is deionized water; the film fixing agent is a dicarboxylic acid salt with 8 to 13 carbon atoms.

[0068] The oxidant is hydrogen peroxide; the film-forming agent is sodium molybdate; and the complexing agent is tannic acid.

[0069] The penetrant is an organosiloxane; the organosiloxane includes 1,8-bis(trimethoxysilyl)octane and methyltrimethoxysilane; the 1,8-bis(trimethoxysilane) The weight ratio of silyl)octane and methyltrimethoxysilane is 0.6:1.

[0070] The dicarboxylic acid salt is sodium phthalate.

[0071] In terms of mass percentage, the preparation raw material also includes 0.3% polyvinyl alcohol.

[0072] The polyvinyl alcohol includes a hi...

Embodiment 2

[0079] Example 2 of the present invention provides a phosphorus- and nitrogen-free chromium-free stainless steel passivation solution. In terms of mass percentage, the preparation raw materials include at least 5% oxidant, 5% film-forming agent, 10% complexing agent, 0.2% penetrant, and 2% The film fixing agent and the balance is deionized water; the film fixing agent is a dicarboxylic acid salt with 8 to 13 carbon atoms.

[0080] The oxidant is hydrogen peroxide; the film-forming agent is sodium molybdate; and the complexing agent is tannic acid.

[0081] The penetrant is an organosiloxane; the organosiloxane includes 1,8-bis(trimethoxysilyl)octane and methyltrimethoxysilane; the 1,8-bis(trimethoxysilane) The weight ratio of silyl)octane and methyltrimethoxysilane is 1:1.

[0082] The dicarboxylic acid salt is sodium phthalate.

[0083] In terms of mass percentage, the preparation raw material also includes 2% polyvinyl alcohol.

[0084] The polyvinyl alcohol includes a high degree o...

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Abstract

The invention relates to the technical field of stainless steel surface treatment. More specifically, the invention provides a phosphorus-free, nitrogen-free and chromium-free stainless steel passivation solution. The phosphorus-free, nitrogen-free and chromium-free stainless steel passivation solution is at least prepared from the following raw materials in percentage by mass: 1 to 5 percent of oxidizing agent, 1 to 5 percent of film-forming agent, 3 to 10 percent of complexing agent, 0.01 to 0.2 percent of penetrating agent, 0.5 to 2 percent of film curing agent and the balance of deionizedwater, wherein the film curing agent is dicarboxylate with 8 to 13 carbon atoms. The phosphorus-free, nitrogen-free and chromium-free stainless steel passivation solution provided by the invention canform a layer of stable corrosion-resistant organic complex passivation film on the surface of martensite stainless steel, is good in film forming effect and high in compactness, has relatively high corrosion resistance retentivity under saline solution, heating and acid environments as well as under pressure steam, and can prolong the service life of the martensite stainless steel.

Description

Technical field [0001] The present invention relates to the technical field of surface treatment of stainless steel. More specifically, the present invention provides a phosphorus- and nitrogen-free chromium-free stainless steel passivation solution and a preparation method thereof. Background technique [0002] Martensitic stainless steel is one of the stainless steel varieties with the largest output and the most widely used. The commonly used grades of martensitic stainless steel with chromium as the main alloying element are 9Cr18, 9Cr18Mo, AISI440C, etc. Due to the inherent characteristics of the material, martensitic stainless steel must undergo surface passivation after fine grinding and polishing to form a strong corrosion-resistant oxide film. [0003] At present, the preparation methods of passivation solution for passivation treatment of martensitic stainless steel mainly include nitric acid passivation method, chromate passivation method and electrochemical method. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/40
CPCC23C22/40C23C2222/20
Inventor 陆碧红何汉泉
Owner 深圳市钝化技术有限公司
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