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A method for salt bath chromizing of stainless steel castings

A technology for stainless steel and castings, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc. It can solve the problems of difficult removal of residue on the surface of the workpiece, poor fluidity of molten salt, and sticky salt of the workpiece, so as to improve the hardness and Effects of corrosion resistance, hardness improvement, and surface energy improvement

Active Publication Date: 2019-04-23
安徽省含山县兴建铸造厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, salt bath chromizing is a surface treatment process that has emerged in recent years. Although it has been extensively researched and optimized, there are still some technical problems in actual operation, such as poor fluidity of molten salt, serious salt sticking to the workpiece, and The residue on the surface of the workpiece obtained is not easy to remove, so there is an urgent need for a more scientific and reasonable operation method for salt bath chromizing of stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for salt bath chromizing of stainless steel castings, comprising the following steps:

[0015] (1) After the surface of the stainless steel casting is decontaminated and degreased, it is dried in an oven at 70°C for 2 hours;

[0016] (2) In parts by weight, 60 parts of base salt, 14 parts of chromium donor, 3 parts of reducing agent, 1 part of sodium ethylenediaminopropanesulfonate, 1 part of tetraheptyl ammonium iodide, 0.5 part of 6-nitrate After mixing the base benzimidazole nitrate and heating it to 885°C, put the stainless steel casting in a salt bath for 3.5 hours, then take it out and cool it to room temperature to obtain a finished product; wherein the base salt is made of the following components by weight: Ingredients: 1 part of sodium orthovanadate, 4 parts of sodium trifluoroacetate, 75 parts of borax.

[0017] Specifically, the chromium donor in the above step (2) is made of chromium oxide and sodium chromate at a mass ratio of 25:2.

[0018] Spe...

Embodiment 2

[0020] A method for salt bath chromizing of stainless steel castings, comprising the following steps:

[0021] (1) After the surface of the stainless steel casting is decontaminated and degreased, it is dried in an oven at 75°C for 2.5 hours;

[0022] (2) In parts by weight, 65 parts of base salt, 16 parts of chromium donor, 4 parts of reducing agent, 1 part of sodium ethylenediaminopropanesulfonate, 1 part of tetraheptyl ammonium iodide, 0.7 part of 6-nitrate After mixing the base benzimidazole nitrate and heating it to 890°C, put the stainless steel casting in a salt bath for 3.8 hours, then take it out and cool it to room temperature to obtain a finished product; wherein the base salt is made of the following components by weight: Ingredients: 2 parts of sodium orthovanadate, 7 parts of sodium trifluoroacetate, 78 parts of borax.

[0023] Specifically, the chromium donor in the above step (2) is made of chromium oxide and sodium chromate at a mass ratio of 25:4.

[0024] ...

Embodiment 3

[0026] A method for salt bath chromizing of stainless steel castings, comprising the following steps:

[0027] (1) After the surface of the stainless steel casting is decontaminated and degreased, it is dried in an oven at 80°C for 3 hours;

[0028] (2) In parts by weight, 72 parts of base salt, 18 parts of chromium donor, 5 parts of reducing agent, 2 parts of sodium ethylenediaminopropanesulfonate, 2 parts of tetraheptyl ammonium iodide, 0.8 parts of 6-nitrate After mixing the base benzimidazole nitrate and heating it to 900°C, put the stainless steel casting in a salt bath for 4 hours, then take it out, and cool it to room temperature to obtain a finished product; wherein the base salt is made of the following components by weight: Ingredients: 3 parts of sodium orthovanadate, 9 parts of sodium trifluoroacetate, 80 parts of borax.

[0029] Specifically, the chromium donor in the above step (2) is made of chromium oxide and sodium chromate at a mass ratio of 25:5.

[0030] ...

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Abstract

The invention discloses a method for salt bath chromizing of a stainless steel casting. The method comprises the following operating steps that (1) dirt and oil on the surface of the stainless steel casting are removed, and then the stainless steel casting is placed in an oven at 70-80 DEG C to be dried and treated for 2-3 h; and (2) base salt, a chromium supplying agent, a reducing agent, ethylenediamine-based propanesulfonic acid sodium, tetraheptylammonium iodide and 6-nitrobenzimidazole nitrate are mixed and then heated to 885-900 DEG C, then the stainless steel casting is placed in the mixture to be subjected to salt bath treatment for 3.5-4 h, then taken out and cooled to be the room temperature, and a finished product is prepared. The treatment method for salt bath chromizing is easy to operate and low in cost, waste gas, waste water and industrial residue are less in the production process, the fluidity of molten salt is good, residue on the workpiece surface is easy to remove, and the hardness and corrosion resistance of the stainless steel surface can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of casting of stainless steel castings, and in particular relates to a salt-bath chromizing method for stainless steel castings. Background technique [0002] Stainless steel is more and more popular with people because of its beautiful appearance, corrosion resistance, and the advantages of not being easily damaged. More and more stainless steel is used in pots and pans, urban sculptures, buildings, and decorated rooms. The acquisition of the excellent performance of stainless steel is related to the properties of its own material on the one hand, and depends on the scientific and effective surface treatment process on the other hand. Among them, salt bath chromizing is a surface treatment process that has emerged in recent years. Although it has been extensively researched and optimized, there are still some technical problems in actual operation, such as poor fluidity of molten salt, serious salt stickin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/24
CPCC23C10/24
Inventor 李传
Owner 安徽省含山县兴建铸造厂
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