Stainless steel chromium-free passivator and surface treatment method

A chromium-free passivator and surface treatment technology, applied in the coating process of metal materials, etc., can solve problems such as poor corrosion resistance, surface corrosion and oxidation, and failure to meet the salt resistance requirements of stainless steel, so as to improve corrosion resistance, Improved corrosion resistance and short passivation treatment time

Active Publication Date: 2021-09-24
广东东明新材科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent CN102899653A application announced the use of stainless steel chemical chromium-free passivation treatment method composed of ammonium molybdate, sulfamic acid, organic phosphoric acid, sodium citrate, etc. Although the formed oxide film is a chromium-free conversion film, the corrosion resistance Very poor, can not meet the salt resistance requirements of stainless steel, the surface is easily corroded and oxidized again in the air

Method used

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  • Stainless steel chromium-free passivator and surface treatment method
  • Stainless steel chromium-free passivator and surface treatment method
  • Stainless steel chromium-free passivator and surface treatment method

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preparation example Construction

[0035] Modified Nano TiO 2 Preparation of:

[0036] Add 0.1-0.5g of nano-titanium dioxide into 100mL Tris-HCL buffer solution (pH=8.5), disperse ultrasonically at 500-800W for 30-45min, continue to add 0.1-0.5g of dopamine hydrochloride, and stir the reaction at 40-50°C for 6- 8 hours, centrifugal separation, washing the solid product three times with water and ethanol respectively, and drying in vacuum at 35-40° C. for 12-24 hours to obtain polydopamine-modified nano-titanium dioxide.

Embodiment 1

[0038] Degreasing treatment: immerse 304 stainless steel workpiece in degreasing agent (sodium hydroxide 10g / L, sodium carbonate 20g / L, trisodium phosphate 5g / L, sodium metasilicate pentahydrate 1.25g / L, OP-10 emulsifier 1g / L , sodium dodecylbenzenesulfonate 2g / L, and the balance is water), soaking treatment at a temperature of 60°C for 6 minutes, and then entering activation treatment after washing with water;

[0039] Activation treatment: immerse the stainless steel workpiece in the activator (50% sulfuric acid 50-100g / L, 50% hydrogen peroxide 25-50g / L, anhydrous ethanol 20mL / L, the balance is water), soak at 30-50°C for 30 ~60s, enter passivation treatment after washing;

[0040] Passivation treatment: immerse 304 stainless steel workpiece in chromium-free passivation agent (45% fluorotitanic acid 3g / L, 68% nitric acid 300g / L, sodium metavanadate 20g / L, 50% nickel nitrate 10g / L, modified nano Titanium dioxide 3g / L, the balance is water), soaking treatment at 55-65°C for 1...

Embodiment 2

[0045] The difference between embodiment 2 and embodiment 1 is that the stainless steel workpiece processed is a 316 stainless steel workpiece, wherein the chromium-free passivating agent used for passivation treatment includes components of 45% fluorotitanic acid 5g / L, 68% nitric acid 350g / L L, sodium metavanadate 10g / L, 50% nickel nitrate 20g / L, modified nano titanium dioxide 5g / L, and the balance is water.

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Abstract

The invention belongs to the field of stainless steel surface treatment, and particularly discloses a stainless steel chromium-free passivator and a surface treatment method. The stainless steel chromium-free passivator comprises the following components: 3 to 8 g/L of 45-percent fluotitanic acid, 300 to 350 g/L of 68-percent nitric acid, 10 to 20 g/L of sodium metavanadate, 10 to 20 g/L of 50-percent nickel nitrate, 2 to 5 g/L of modified nano titanium dioxide and the balance of water. The chromium-free passivator provided by the invention can form a layer of chromium-free passivating film on the surface of stainless steel, the corrosion resistance of the surface of the stainless steel can be remarkably improved, and meanwhile, the chromium-free passivator has the advantages of being environmentally friendly, non-toxic, easy to operate, free of influence on the appearance shape of the surface of the stainless steel, high in passivating film adhesive force and the like.

Description

technical field [0001] The invention relates to the field of stainless steel surface treatment, in particular to a chromium-free passivator for stainless steel and a surface treatment method. Background technique [0002] As a widely used industrial material, stainless steel is used in various fields of society because of its superior wear resistance and corrosion resistance. However, in many corrosive environmental media, stainless steel corrosion still often occurs. Through chemical treatment, a corrosion-resistant conversion film can be formed on the surface of stainless steel, which basically does not change the appearance and shape of the stainless steel surface. In order to improve the anti-corrosion ability requirements of the stainless steel surface, it is necessary to form a protective layer on the stainless steel surface. For example, the patent CN102899653A application announced the use of stainless steel chemical chromium-free passivation treatment method compose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44C23C22/78C23C22/83C23G1/19
CPCC23C22/44C23C22/78C23C22/83C23G1/19
Inventor 熊猛况金权李远衡
Owner 广东东明新材科技有限公司
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