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Stainless steel salt bath treatment method

A stainless steel, salt bath technology, applied in coating, metal material coating process, solid diffusion coating, etc., can solve the problem that it cannot be used to withstand high pressure and long-term impact load, the compound layer on the surface of the part is brittle, and the heating temperature Low-level problems, to achieve the effect of improving corrosion resistance, reducing operation difficulty and safety, and low coating brittleness

Inactive Publication Date: 2018-05-15
马鞍山市鑫龙特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, salt bath nitriding is a common treatment method for metal surface treatment. It refers to the nitriding technology that uses active N and C atoms generated in the salt bath to penetrate into the surface and interior of the workpiece to form a compound layer and a diffusion layer. The equipment is relatively simple, the heating speed is fast, the heating temperature is low, and the heating time is short, but it can significantly improve the fatigue strength, corrosion resistance and wear resistance of the parts. The disadvantage is that the compound layer on the surface of the parts is very thin and brittle, so it cannot be used Capable of withstanding high pressure and long-term shock loads

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for stainless steel salt bath treatment, comprising the following steps:

[0017] (1) After cleaning the stainless steel, the surface is fully polished with 600# sandpaper;

[0018] (2) Then, the stainless steel treated in step (1) is treated with a nitride salt bath, the temperature of the nitride salt bath is 390°C, the time of the nitride salt bath is 50min, and the salt bath is made of the following components by weight : 45 parts of urea, 14 parts of melamine cyanurate, 2 parts of sodium methacrylate, 3 parts of behenamide, 10 parts of sodium carbonate, 10 parts of potassium carbonate;

[0019] (3) After spraying the modified liquid on the surface of the stainless steel treated in step (2), carry out oxidation treatment, and then wash it with clean water, wherein the modified liquid is made of the following components by weight: trimethylsulfoxide iodide 3 parts, 8 parts of sodium propylene sulfonate, and 190 parts of water.

[0020] Specifically, the ab...

Embodiment 2

[0025] A method for stainless steel salt bath treatment, comprising the following steps:

[0026] (1) After cleaning the stainless steel, the surface is fully polished with 600# sandpaper;

[0027] (2) Then, the stainless steel treated in step (1) is treated with a nitride salt bath, the temperature of the nitride salt bath is 400°C, the time of the nitride salt bath is 55min, and the salt bath is made of the following components by weight : 50 parts of urea, 16 parts of melamine cyanurate, 3 parts of sodium methacrylate, 5 parts of behenamide, 12 parts of sodium carbonate, 12 parts of potassium carbonate;

[0028] (3) After spraying the modified liquid on the surface of the stainless steel treated in step (2), perform oxidation treatment, and then wash it with clean water, wherein the modified liquid is made of the following components by weight: trimethylsulfoxide iodide 5 parts, 9 parts of sodium propylene sulfonate, and 195 parts of water.

[0029] Specifically, the abov...

Embodiment 3

[0034] A method for stainless steel salt bath treatment, comprising the following steps:

[0035] (1) After cleaning the stainless steel, the surface is fully polished with 600# sandpaper;

[0036] (2) Then the stainless steel treated in step (1) is treated with a nitride salt bath, the temperature of the nitride salt bath is 410°C, the time of the nitride salt bath is 60min, and the salt bath liquid is made of the following components by weight : 55 parts of urea, 18 parts of melamine cyanurate, 5 parts of sodium methacrylate, 6 parts of behenamide, 13 parts of sodium carbonate, 13 parts of potassium carbonate;

[0037] (3) After spraying the modified liquid on the surface of the stainless steel treated in step (2), perform oxidation treatment, and then wash it with clean water, wherein the modified liquid is made of the following components by weight: trimethylsulfoxide iodide 7 parts, 10 parts of sodium propylene sulfonate, and 200 parts of water.

[0038] Specifically, t...

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Abstract

The invention discloses a stainless steel salt bath treatment method. The stainless steel salt bath treatment method comprises the following operation steps that 1, after the stainless steel is cleaned, the surface of the stainless steel is fully polished by using 600 # abrasive paper; 2, then the treated stainless steel is subjected to nitriding salt bath treatment, and the temperature of the nitriding salt bath is 390-410 DEG C, the time of the nitriding salt bath is 50-60 min; and 3, after the modified liquid is sprayed on the surface of the treated stainless steel, oxidation treatment is carried out, and then clean water is used for cleaning the treated stainless steel. According to the salt bath treatment method, salt bath liquid is safe and environment-friendly, no toxic cyanide is volatilized at room temperature, the surface of the treated stainless steel is thick, the thickness of the surface of the treated stainless steel can reach about 25 microns, the corrosion resistance and the wear resistance of the stainless steel are remarkably improved, the brittleness of the coating on the surface is low, a long-term impact load can be resisted, and the quality of the stainless steel is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel surface treatment, and in particular relates to a method for stainless steel salt bath treatment. Background technique [0002] Metal surface engineering technology mainly refers to the use of surface modification technology to impart special mechanical, physical or chemical properties that the base material itself does not have, such as high hardness, high wear resistance, friction reduction, high temperature oxidation resistance, radiation resistance, etc. , and the properties of the matrix itself are generally not greatly affected. Among them, salt bath nitriding is a common treatment method for metal surface treatment. It refers to the nitriding technology that uses active N and C atoms generated in the salt bath to penetrate into the surface and interior of the workpiece to form a compound layer and a diffusion layer. The equipment is relatively simple, the heating speed is fast, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/50C23C8/80C23C22/68
CPCC23C8/50C23C8/80C23C22/68
Inventor 高欣王军
Owner 马鞍山市鑫龙特钢有限公司
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