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Stainless steel whitening solution and whitening technique thereof

A stainless steel and whitening technology, applied in the field of whitening solution and its whitening process, can solve the problems of high risk factor, great environmental harm, no metallic luster, etc., and achieve the effect of small risk factor and low environmental harm.

Inactive Publication Date: 2008-07-09
MITAC PRECISION TECH(KUNSHAN) CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Due to its excellent corrosion resistance, stainless steel has attracted more and more attention from all walks of life, and is used more and more widely in various fields of the industrial sector. As we all know, some products required by customers must be made of stainless steel, but because customers require It does not have metallic luster. In this case, the whitening process will be carried out on the stainless steel material. The current whitening process mostly contains high concentration of nitric acid (about 40-60%), which has a high risk factor and a relatively large environmental hazard. Its whitening effect is mostly off-white

Method used

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  • Stainless steel whitening solution and whitening technique thereof

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Embodiment Construction

[0017] Stainless steel whitening solution provided by the present invention, with water as solvent, contains in every liter of this solution:

[0018] Nitric acid 4%-10%;

[0019] Phosphoric acid 10-40g;

[0020] Boric acid 2-5g;

[0021] Acetic acid 5-30g;

[0022] Ammonium sulfate 10-30g;

[0023] Trisodium phosphate 10-30g;

[0024] Ammonium bifluoride 15-35g.

[0025] Please refer to FIG. 1 , which is a process flow diagram of using the stainless steel whitening solution of the present invention to wash the surface of stainless steel.

[0026] As shown in Figure 1, the technological process is:

[0027] Pretreatment is mainly to remove impurities and dirt on the surface of stainless steel;

[0028] Degrease, put the pretreated stainless steel into a solution containing sodium hydroxide 5g / L and sodium dodecylbenzenesulfonate 3g / L at a temperature of 40°C for 5 minutes;

[0029] Pickling, put the degreased stainless steel into a solution containing 5% sulfuric acid ...

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Abstract

The invention provides stainless steel washed white solution, which uses water as solvent, every one liter of the solution comprises 4-10 percent of nitric acid, 10-40g phosphoric acid, 2.5g boric acid, 5-30g acetic acid, 10-30g ammonium sulfate, 10-30g trisodium phosphate and 15-35g ammonium bifluoride. The method of using the stainless steel washed white solution to do the washed white process of the surface of stainless steel has the technological processes of pretreatment, degreasing, pickling, washing white, washing and baking, wherein after the stainless steel which is needed to be washed white is pretreated, degreased and pickled, the stainless steel which is pickled is put into the stainless steel washed white solution for 10-35 minutes in 55-85 DEG C, at last through washing and baking, the surface of the stainless steel is formed with an uniform silvery film layer which has a sand surface effect.

Description

【Technical field】 [0001] The invention relates to a whitening solution and a whitening process thereof, in particular to a stainless steel whitening solution and a whitening process thereof. 【Background technique】 [0002] Due to its excellent corrosion resistance, stainless steel has attracted more and more attention from all walks of life, and is used more and more widely in various fields of the industrial sector. As we all know, some products required by customers must be made of stainless steel, but because customers require It does not have metallic luster. In this case, the whitening process will be carried out on the stainless steel material. The current whitening process mostly contains high concentration of nitric acid (about 40-60%), which has a high risk factor and a relatively large environmental hazard. Its whitening effect is mostly off-white. [0003] In view of this, it is necessary to develop a stainless steel whitening solution and a whitening process the...

Claims

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Application Information

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IPC IPC(8): C23C22/36C23C28/00C23G1/08
Inventor 雷波
Owner MITAC PRECISION TECH(KUNSHAN) CORP
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