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Anti-discoloration treatment method for stainless steel work piece

A processing method and technology of stainless steel, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve problems such as unfavorable production and use, increase in cost, etc., and achieve less corrosion weight loss, high temperature resistance and discoloration ability. High temperature resistance to discoloration

Active Publication Date: 2018-08-03
浙江福腾宝家居用品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of elements such as Ti and Nb will easily lead to an increase in cost and is not conducive to actual production and use.

Method used

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  • Anti-discoloration treatment method for stainless steel work piece
  • Anti-discoloration treatment method for stainless steel work piece
  • Anti-discoloration treatment method for stainless steel work piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, the stainless steel workpiece processed by 340 stainless steel is used, and the pre-processed stainless steel cookware workpiece is placed in a drying tunnel or oven with a temperature controlled at 260-300 ° C, and is subjected to high-temperature oxidation baking in an air atmosphere Treat for 60 minutes to form an oxide film on the surface of the stainless steel. The formed oxide film will form a light yellow-brown-brown oxide film color change state during the treatment process. After the high-temperature baking treatment, immerse the stainless steel cookware workpiece that has undergone high-temperature discoloration into sulfuric acid The chemical etching treatment is carried out in the aqueous solution, and the hydrogen ions in the acidic solution react with the oxides in the oxide film to remove the oxides in the oxide film, so as to restore the original color of the stainless steel workpiece without basically damaging the surface. The pH value o...

Embodiment 2

[0042] In this example, a stainless steel workpiece processed from 340 stainless steel is used, and the pre-processed stainless steel cookware workpiece is placed in a drying tunnel or oven with a temperature controlled at 310-400°C, and is subjected to high-temperature oxidation baking in an air atmosphere Treat for 20 minutes to form an oxide film on the surface of the stainless steel. The formed oxide film will form a light yellow-brown-brown oxide film color change state during the treatment process. After the high-temperature baking treatment, immerse the stainless steel cookware workpiece that has undergone high-temperature discoloration into oxalic acid The aqueous solution is chemically etched to remove surface oxides and achieve the effect of restoring the original color of stainless steel workpieces without basically damaging the surface. The pH value of the acidic solution here is controlled below 3, and the specific conditions of the above-mentioned chemical etching...

Embodiment 3

[0048] In this embodiment, the stainless steel workpiece processed by 340 stainless steel is used, and the pre-treated stainless steel cookware workpiece is placed in a drying tunnel or oven with a temperature controlled at 500 ° C, and is subjected to high-temperature oxidation baking treatment in an air atmosphere. Minutes to form an oxide film on the surface of the stainless steel, the formed oxide film will form a light yellow-brown-brown oxide film color change state during the treatment process, after the high-temperature baking treatment, immerse the stainless steel cookware workpiece that has undergone high-temperature discoloration into the citric acid aqueous solution Carry out chemical etching treatment, the specific conditions of above-mentioned chemical etching treatment are as follows:

[0049] Citric acid (C 6 h 8 o 7 ): 50 g / l

[0050] Temperature: 60°C

[0051] Time: 10 minutes

[0052] After the chemical etching treatment is finished, the subsequent clea...

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Abstract

The invention relates to an anti-discoloration treatment method for a stainless steel work piece, belongs to the technical field of surface treatment of stainless steel and aims to solve the problem of how to improve the high-temperature discoloration resistance of the stainless steel. The anti-discoloration treatment method for the stainless steel work piece provided by the invention comprises the following steps of: performing oxidative roasting on the stainless steel work piece under an aerobic condition to form an oxidation film on the surface; and chemically processing the roasted stainless steel work piece by using an acidic solution to remove the oxidation film on the surface so as to obtain a corresponding anti-discoloration stainless steel work piece. The anti-discoloration treatment method provided by the invention achieves an effect of effectively improve the high-temperature discoloration resistance of the stainless steel work piece, and thus a stainless steel work piece product has the advantage of barely having a discoloration behavior when being used under the condition that the temperature is 400-500 DEG C.

Description

technical field [0001] The invention relates to an anti-discoloration treatment method for stainless steel workpieces, belonging to the technical field of stainless steel surface treatment. Background technique [0002] In the cookware industry, stainless steel is widely used for its corrosion resistance and high strength. At the same time, stainless steel is highly praised for its hardness, wear resistance, and non-reaction with food. In addition, ferritic stainless steel has magnetic conductivity, which can be used as a contact material for induction cookers, and is also widely used in the cookware industry. However, during the cooking process of stainless steel products, when the temperature exceeds 200°C, the stainless steel will start to turn yellow, and the higher the temperature, the more serious the yellowing will be. It is a common behavior for cookware to use temperatures exceeding 200°C, and yellowing means defects. [0003] At present, the corrosion resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/14C23G1/08
CPCC23C8/14C23G1/08
Inventor 徐存荣
Owner 浙江福腾宝家居用品有限公司
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