Stainless steel electrolytic passivator, preparation method and application thereof

An electrolytic passivation, stainless steel technology, applied in the direction of anodic oxidation, etc., can solve the problems that the service life of stainless steel products cannot be greatly improved, the service life of stainless steel products is reduced, and the environmental protection requirements are not met, so as to reduce the efficiency of electrolytic passivation , improve the service life and avoid the effect of heavy metal pollution

Active Publication Date: 2019-07-02
Dongguan Kaimeng Chemical Co Ltd
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, stainless steel is relative, and it is prone to rust in the presence of halogen ions such as (chlorine, fluorine, etc.). Influenced by the impact, it is very easy to produce pitting corrosion on the bottom of the pot; secondly, the liner or lid of the electric pressure cooker used for cooking will also cause corrosion on the surface of the parts due to the contact with salt and high temperature during use. If these conditions do not take appropriate measures Anti-rust treatment will seriously reduce the service life of stainless steel products
[0003] At present, the chemical passivation method is usually used for this situation. Using the action of the strong oxidizing agent in the passivation agent, a microscopic chemical reaction occurs on the metal surface to form a dense passivation film to achieve rust prevention. However, this process There are also certain limitations such as: 1. Due to the chemical microscopic reaction, the processing time is usually longer than 30 minutes, and the passivation efficiency is low; 2. Although chemical passivation can form a dense passivation film on the surface of the material, the passivation film is thin , it is difficult to meet the higher antirust requirements, and the service life of stainless steel products is still not greatly improved; 3. The existing stainless steel passivation is still treated with phosphoric acid, nitric acid or chromic acid, which does not meet today's environmental protection requirements

Method used

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  • Stainless steel electrolytic passivator, preparation method and application thereof
  • Stainless steel electrolytic passivator, preparation method and application thereof
  • Stainless steel electrolytic passivator, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A stainless steel electrolytic passivator, comprising the following raw materials in parts by weight:

[0036]

[0037]

[0038] Described sulfuric acid is the concentrated sulfuric acid that mass fraction is 98%.

[0039] The corrosion inhibitor is prepared by mixing thiourea derivatives, polyaspartic acid and molybdate in a weight ratio of 0.2:1:0.7.

[0040] The molybdate is formed by mixing sodium molybdate, ammonium molybdate and potassium molybdate in a weight ratio of 2:0.7:0.8.

[0041] The thiourea derivative is formed by mixing methylthiourea and lauroylthiourea at a weight ratio of 1.5:2.5.

[0042] The wetting agent is polyethylene glycol, and the polyethylene glycol is composed of PEG-600 and PEG-400 in a weight ratio of 2:4.

[0043] The stainless steel electrolytic passivator also includes 2 parts by weight of sulfamic acid and 0.3 parts by weight of propylene glycol.

[0044] The above-mentioned preparation method of the stainless steel electrol...

Embodiment 2

[0049] A stainless steel electrolytic passivator, comprising the following raw materials in parts by weight:

[0050]

[0051] Described sulfuric acid is the concentrated sulfuric acid that mass fraction is 93%.

[0052] The corrosion inhibitor is formed by mixing thiourea derivatives, polyaspartic acid and molybdate in a weight ratio of 0.1:0.5:0.5.

[0053] The molybdate is formed by mixing sodium molybdate, ammonium molybdate and potassium molybdate in a weight ratio of 1:0.5:0.5.

[0054] The thiourea derivative is formed by mixing methylthiourea and lauroylthiourea at a weight ratio of 1:2.

[0055] The stainless steel electrolytic passivator also includes 1 weight part of sulfamic acid.

[0056] The preparation method of the above-mentioned stainless steel electrolytic passivator comprises the following steps: weighing each raw material by weight; under the condition of continuous stirring, adding sulfuric acid to the water, controlling the temperature at 20-30°C, t...

Embodiment 3

[0061] A stainless steel electrolytic passivator, comprising the following raw materials in parts by weight:

[0062]

[0063] Described sulfuric acid is the concentrated sulfuric acid that mass fraction is 98%.

[0064] The corrosion inhibitor is formed by mixing thiourea derivatives, polyaspartic acid and molybdate in a weight ratio of 0.4:1.5:3.

[0065] The molybdate is formed by mixing sodium molybdate, ammonium molybdate and potassium molybdate in a weight ratio of 3:1:1.

[0066] The thiourea derivative is formed by mixing methylthiourea and lauroylthiourea at a weight ratio of 2:3.

[0067] The wetting agent is polyethylene glycol, and the polyethylene glycol is composed of PEG-600 and PEG-400 in a weight ratio of 2:5.

[0068] The stainless steel electrolytic passivator also includes 3 parts by weight of sulfamic acid and 0.6 parts by weight of propylene glycol.

[0069] The above-mentioned preparation method of the stainless steel electrolytic passivator compri...

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Abstract

The invention relates to the technical field of stainless steel surface treatment, in particular to a stainless steel electrolytic passivator, a preparation method and application thereof. The stainless steel electrolytic passivator is prepared from the following raw materials: sulfuric acid, manganese sulfate, a corrosion inhibitor, a wetting agent and water. Compared with an existing passivator,the stainless steel electrolytic passivator is more environment-friendly in components, faster in electrolytic passivation efficiency under the action of a specific current and thicker in passivationfilms on the surface of stainless steel after passivation, higher corrosion resistance requirements are met, and the service life of stainless steel products is prolonged.

Description

technical field [0001] The invention relates to the technical field of stainless steel surface treatment, in particular to a stainless steel electrolytic passivator, its preparation method and application. Background technique [0002] Stainless steel materials have strong corrosion resistance and decorative characteristics. In recent years, it has become more and more popular among consumers, especially in some food utensils and small household electrical appliances that are in direct contact with food. However, stainless steel is relative, and it is prone to rust in the presence of halogen ions such as (chlorine, fluorine, etc.). Influenced by the impact, it is very easy to produce pitting corrosion on the bottom of the pot; secondly, the liner or lid of the electric pressure cooker used for cooking will also cause corrosion on the surface of the parts due to the contact with salt and high temperature during use. If these conditions do not take appropriate measures Anti-...

Claims

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Application Information

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IPC IPC(8): C25D11/34
CPCC25D11/34
Inventor 刘子林刘子灿
Owner Dongguan Kaimeng Chemical Co Ltd
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