Glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel

A technology of glow ion penetration and surface hardness, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., and can solve the problem of stainless steel depassivation film and so on

Inactive Publication Date: 2016-05-25
FUJIAN WIDE PLUS PRECISION INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of stainless steel depassivation film, and provide a glow ion carburizing method to improve the hardness and corrosion resistance of austenitic stainless steel parts in instrument valves and pipe joints

Method used

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  • Glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel
  • Glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel
  • Glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel

Examples

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Effect test

Embodiment 1

[0042] A glow ion carburizing method for improving the surface hardness and corrosion resistance of stainless steel, comprising the following steps: first degreasing the same batch of 316 stainless steel in an oil-removing solvent at 80°C, soaking for 10 minutes, and cleaning the stainless steel surface with distilled water Liquid, and dry, spare;

[0043] 1) Put the surface clean and dry 316 stainless steel obtained in the above steps on the cathode disc in the carburizing furnace, vacuumize the carburizing furnace, and clean the furnace chamber with high-purity hydrogen for 2 times. After the cleaning is completed, re-carburize The pressure in the furnace is pumped down to below 50Pa;

[0044] 2) Apply a DC pulse high voltage between the cathode disc and the inner wall of the furnace, and fill it with argon until the pressure in the carburizing furnace is 100Pa, and the oxide film on the surface of the stainless steel is removed by glow discharge; arcing is not allowed on th...

Embodiment 2

[0049] A glow ion carburizing method for improving surface hardness and corrosion resistance of stainless steel, comprising the following steps:

[0050] 1) Place clean and dry austenitic stainless steel on the cathode disc in the carburizing furnace, vacuumize the carburizing furnace, and clean the furnace chamber with high-purity hydrogen for 3 times. The pressure is pumped below 50Pa;

[0051] 2) Apply a DC pulse high voltage between the cathode disc and the inner wall of the furnace, and fill it with argon until the pressure in the carburizing furnace is 200Pa, and the oxide film on the surface of the stainless steel is removed by glow discharge; arcing is not allowed on the surface of the workpiece, and the glow During the photodischarge process, the temperature of the stainless steel also rises at the same time;

[0052] 3) When the temperature of the stainless steel rises to the carburizing temperature, turn off the argon source, and pass a carbon-containing reducing g...

Embodiment 3

[0056] A glow ion carburizing method for improving surface hardness and corrosion resistance of stainless steel, comprising the following steps:

[0057] 1) Place clean and dry austenitic stainless steel on the cathode disk in the carburizing furnace, vacuumize the carburizing furnace, and clean the furnace chamber with high-purity hydrogen for 2-3 times. After cleaning, re-carburize The pressure in the furnace is pumped down to below 50Pa;

[0058] 2) Apply a DC pulse high voltage between the cathode disc and the inner wall of the furnace, and fill it with argon until the pressure in the carburizing furnace is 150Pa, and the oxide film on the surface of the stainless steel is removed by glow discharge; arcing is not allowed on the surface of the workpiece, and the glow During the photodischarge process, the temperature of the stainless steel also rises at the same time;

[0059] 3) When the temperature of the stainless steel rises to the carburizing temperature, turn off the...

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Abstract

The invention discloses a glow ion carbonization method for enhancing surface hardness and corrosion resistance of stainless steel. The method comprises the following steps: putting an austenitic stainless steel part with clean and dry surface in a glow ion nitriding furnace; evacuating air in the furnace, cleaning the hearth with high-purity hydrogen, charging argon under high voltage, and carrying out glow discharge to remove the passivating film on the stainless steel surface, thereby obtaining the activated surface. In the glow discharge process, under the plasma bombarding action, the temperature of the stainless steel rises; when the temperature rises to the carburizing temperature, the argon is shut down, and a carbon-containing reducing atmosphere is introduced to a certain pressure to perform carburization; and after the carburization is finished, the stainless steel is immersed in an etching solution to remove the non-corrosion-resistant layer on the workpiece surface, thereby enhancing the hardness and corrosion resistance of the austenitic stainless steel. The treated stainless steel has the advantages of uniform surface carburized layer, high safety and reliability, no pollution and the like.

Description

technical field [0001] The invention relates to the field of chemical heat treatment, in particular to a glow ion carburizing method for improving the surface hardness and corrosion resistance of stainless steel. Background technique [0002] Austenitic stainless steel occupies an extremely important position in the field of stainless steel. Austenitic stainless steel is widely used in valves, petroleum pipelines, chemical industry, vehicle engineering and other fields due to its excellent corrosion resistance, room temperature and low temperature plastic toughness, non-magnetism, processability and weldability. However, austenitic stainless steel has a face-centered cubic structure and low surface hardness, which is prone to surface contact fatigue or wear damage in engineering applications, which greatly limits the development and application of austenitic stainless steel. Therefore, the development of austenitic stainless steel surface strengthening process is the key to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38C23C8/22C23C8/80C23C8/02C23F1/44
CPCC23C8/38C23C8/02C23C8/80C23F1/44
Inventor 郑子文林伟郑榕知许启鑫林仁祥黄训松
Owner FUJIAN WIDE PLUS PRECISION INSTR
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