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Stainless steel surface treatment method

A surface treatment and stainless steel technology, which is applied in the direction of plating, coating, and metal material coating process of superimposed layers, can solve problems such as pitting corrosion, and partial defects caused by the thickness of the attachment cannot be controlled, so as to improve the bonding force and increase Physicochemical properties, effect of improving corrosion resistance

Pending Publication Date: 2021-11-02
张艳芳
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In addition, those skilled in the art know that if the chemical conversion film can be evenly distributed on the stainless steel surface, then the chemical conversion film can effectively prevent large-area corrosion from occurring, but although the prior art can ensure that the passivation film is completely attached to the The surface of stainless steel, but the thickness of the attachment and the occurrence of some defects are completely uncontrollable. During the use or working process of the stainless steel, the defects of the passivation film are exposed or easily lead to the exposure of the active crystals of the stainless steel, and pitting occurs. That is, how to effectively improve the corrosion resistance of stainless steel without losing its physical and chemical properties such as hardness is still the focus of current research

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  • Stainless steel surface treatment method

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Effect test

Embodiment 1

[0044] A method for surface treatment of stainless steel, comprising the steps of:

[0045] (1) Preprocessing:

[0046] The pretreatment includes grinding, alkali washing, water washing, activation, water washing and vacuum drying.

[0047] The grinding is performed sequentially with 90#, 180#, 360#, 800#, and 2000# SiC.

[0048] Described alkaline cleaning comprises 30g / L sodium carbonate, 20g / L sodium hydroxide, 15g / L sodium phosphate, and the temperature of described alkaline cleaning is 65 o C, the time is 15 minutes.

[0049] The water washing is deionized warm water.

[0050] The activation is 9wt.%H 2 SO 4 , soaking time is 2min.

[0051] The vacuum drying is vacuum freeze drying.

[0052] (2) Nitriding treatment:

[0053] The nitriding gas is a mixture of nitrogen and hydrogen, the nitrogen flow rate is 0.3 L / min, the hydrogen flow rate is 0.3 L / min, the glow voltage is 600V, and the vacuum in the furnace is 200Pa. The temperature is 360°C and the nitriding ti...

Embodiment 2

[0060] A method for surface treatment of stainless steel, comprising the steps of:

[0061] (1) Preprocessing:

[0062] The pretreatment includes grinding, alkali washing, water washing, activation, water washing and vacuum drying.

[0063] The grinding is performed sequentially with 90#, 180#, 360#, 800#, and 2000# SiC.

[0064] Described alkaline cleaning comprises 30g / L sodium carbonate, 20g / L sodium hydroxide, 15g / L sodium phosphate, and the temperature of described alkaline cleaning is 65 o C, the time is 15 minutes.

[0065] The water washing is deionized warm water.

[0066] The activation is 9wt.%H 2 SO 4 , soaking time is 2min.

[0067] The vacuum drying is vacuum freeze drying.

[0068] (2) Nitriding treatment:

[0069] The nitriding gas is a mixture of nitrogen and hydrogen, the nitrogen flow rate is 0.35L / min, the hydrogen flow rate is 0.35L / min, the glow voltage is 650V, and the vacuum in the furnace is 225Pa. The temperature is 380°C, and the nitriding t...

Embodiment 3

[0076] A method for surface treatment of stainless steel, comprising the steps of:

[0077] (1) Preprocessing:

[0078] The pretreatment includes grinding, alkali washing, water washing, activation, water washing and vacuum drying.

[0079] The grinding is performed sequentially with 90#, 180#, 360#, 800#, and 2000# SiC.

[0080] Described alkaline cleaning comprises 30g / L sodium carbonate, 20g / L sodium hydroxide, 15g / L sodium phosphate, and the temperature of described alkaline cleaning is 65 o C, the time is 15 minutes.

[0081] The water washing is deionized warm water.

[0082] The activation is 9wt.%H 2 SO 4 , soaking time is 2min.

[0083] The vacuum drying is vacuum freeze drying.

[0084] (2) Nitriding treatment:

[0085] The nitriding gas is a mixture of nitrogen and hydrogen, the nitrogen flow rate is 0.4 L / min, the hydrogen flow rate is 0.4 L / min, the glow voltage is 700V, and the vacuum in the furnace is 250Pa. The temperature is 400°C, and the nitriding t...

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Abstract

The invention provides a stainless steel surface treatment method. A nitriding layer is arranged in front of a chemical conversion film, so that invasion of Cl <-> is effectively prevented, and the hardness of stainless steel is improved. Meanwhile, a siloxane three-dimensional network polymer layer is arranged on the surface of the chemical conversion film, and thus the corrosion resistance of the stainless steel is effectively improved.

Description

technical field [0001] The invention relates to the technical field of stainless steel surface treatment, and more specifically, the invention provides a stainless steel surface treatment method. Background technique [0002] Most metals are in a thermodynamically unstable state in an oxidizing environment, and tend to grow a layer of oxide on the surface to isolate the substrate from the oxidizing environment, thereby protecting the substrate from corrosion and oxidation. This process is called passivation. The generated oxide film is a passivation film. [0003] Stainless steel is a silver-white alloy steel with excellent corrosion resistance, wear resistance, toughness and craftsmanship. Its excellent mechanical properties, good chemical stability and non-toxic properties make it widely used in aerospace, Marine, pharmaceutical, nuclear energy engineering, petrochemical and other aspects. In addition, stainless steel is also used for surface decoration in the constructi...

Claims

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Application Information

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IPC IPC(8): C23C8/26C23C22/42C23C22/83C23C28/00C23F11/14
CPCC23C8/26C23C22/42C23C22/83C23C28/00C23F11/149
Inventor 张艳芳
Owner 张艳芳
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