Stainless steel treatment technique

A processing technology, stainless steel technology, applied in metal material coating process, superimposed layer plating, coating and other directions, can solve the problems of great harm to human body and environment, decreased corrosion resistance of stainless steel, and traces left on the substrate, etc. To achieve the effect of less harm and improved anti-corrosion performance

Inactive Publication Date: 2011-09-21
MITAC PRECISION TECH(KUNSHAN) CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current pretreatment of stainless steel includes the following steps: degreasing→chemical cleaning→whitewashing→water washing→air drying→baking. Among them, the whitewashing process mostly uses high-concentration (about 40-60%) nitric acid, which has a high risk factor and is harmful to the human body and the environment. It is very harmful, and the substrate after whitewashing is mostly off-white and often accompanied by poor extinction; in addition, stainless steel is often damaged due to the destruction of the passivation layer after whitewashing, and its corrosion resistance decreases, and it is easy to touch the substrate by hand. surface marks

Method used

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  • Stainless steel treatment technique

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Embodiment 1

[0026] The stainless steel after chemical cleaning is contained in 4% (mass percentage) nitric acid, and concentration is respectively the this of 10g / L phosphoric acid, 2g / L boric acid, 10g / L ammonium sulfate, 10g / L trisodium phosphate and 10g / L ammonium bifluoride Soak in the stainless steel sealing solution for 10 minutes, the working temperature is 55 ℃, the stainless steel is silvery white after being taken out, then washed with water and air-dried, then immersed in 0.5% (mass percentage) CM-02 acrylic resin at room temperature for 2 seconds, and finally When it is taken out and baked, a protective film is formed on the surface of the stainless steel.

Embodiment 2

[0028] The stainless steel after chemical cleaning contains 10% (mass percentage) nitric acid, and concentration is respectively the this of 40g / L phosphoric acid, 5g / L boric acid, 30g / L ammonium sulfate, 30g / L trisodium phosphate and 35g / L ammonium bifluoride Soak in the stainless steel sealing solution for 35 minutes, the working temperature is 85 ℃, the stainless steel is silvery white after taking it out, then wash with water and air dry, then soak in 5% (mass percentage) CM-02 acrylic resin at room temperature for 30 seconds, and finally When it is taken out and baked, a protective film is formed on the surface of the stainless steel.

[0029] Above, the thickness of the protective film is related to the concentration of CM-02 acrylic resin and soaking time.

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Abstract

The invention relates to a stainless steel processing technique comprising the following steps: degreasing-chemical cleaning-washing whitening- water-washing-air-drying-roasting, also comprising a sealing of hole step between the air-drying step and the roasting step; wherein the stainless steel whitening liquid comprises 4-10 wt% of nitric acid, and per liter stainless steel whitening liquid comprises 10-40g of phosphoric acid, 2-5g of boric acid, 10-30g of ammonia sulfate, 10-30g of trisodium phosphate and 10-35g of ammonium acid fluoride, and the stainless steel hole sealing liquid is 0.5-5 wt% of CM-02 acrylic resin. The invention reduces the applied concentration of nitric acid in the process of whitening technology, and has little harm on the environment, furthermore, a layer of good fingerprint-resistant organic protecting film is formed on the surface of the stainless steel in the hole sealing technology, and the invention has obvious sand grain appearance effect.

Description

【Technical field】 [0001] The invention belongs to the field of stainless steel metal surface treatment, whereby a protective film with a silver-white sand surface appearance and excellent corrosion resistance and fingerprint resistance is produced on the stainless steel. 【Background technique】 [0002] The current pretreatment of stainless steel includes the following steps: degreasing→chemical cleaning→whitewashing→water washing→air drying→baking. Among them, the whitewashing process mostly uses high-concentration (about 40-60%) nitric acid, which has a high risk factor and is harmful to the human body and the environment. It is very harmful, and the base material after whitewashing is mostly off-white and often accompanied by poor extinction; in addition, the corrosion resistance of stainless steel is often reduced due to the destruction of the passivation layer after whitening, and it is easy to touch the base material by hand. marks on the surface of the material. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C22/36C23G1/08B05D7/24
Inventor 陈其亮雷波
Owner MITAC PRECISION TECH(KUNSHAN) CORP
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