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Process for nitriding metal surfaces

A technology for metal surfaces and metal workpieces, applied in the field of surface chemical treatment, can solve problems such as limited effect, and achieve the effect of improving the effect

Active Publication Date: 2021-08-13
KUNSHAN SUNMIN DRILUBE ELECTRONIC MATERIAL TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When nitriding the workpiece, the first step is to clean the workpiece to remove the oil on the surface of the workpiece, but in actual cleaning, because the surface of the workpiece is in an irregular state, such as an automobile engine shell, if only Soaking in water to remove oil stains, etc., has a limited effect and cannot really achieve the effect of cleaning oil stains

Method used

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  • Process for nitriding metal surfaces
  • Process for nitriding metal surfaces
  • Process for nitriding metal surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A process for nitriding a metal surface, including a metal workpiece to be processed, the processing of the workpiece includes the following steps:

[0048] 1) Rinse the workpiece with water containing detergent, and then rinse the workpiece with 100°C water after rinsing with clean water;

[0049] 2) Put the oil-removed workpiece in the pool for ultrasonic cleaning, the cleaning vibration frequency is 80KHz, the power density is set at 0.6W / C, and the ultrasonic cleaning time is 8min;

[0050] 3) Preheat the workpiece to 300°C, and the preheating time is 6 minutes;

[0051] 4) Place the workpiece in the nitriding furnace containing Li ion base salt, then extract the air in the nitriding furnace, and refill the mixed gas into the nitriding furnace;

[0052] 5) Place the workpiece in a nitriding furnace with a base salt containing Li ions, raise the nitriding furnace to 520°C, and nitriding time is 80 minutes;

[0053] 6) Add solid sodium peroxide to the base salt, and t...

Embodiment 2

[0067] A process for nitriding a metal surface, including a metal workpiece to be processed, the processing of the workpiece includes the following steps:

[0068] 1) Rinse the workpiece with water containing detergent, and then rinse the workpiece with 100°C water after rinsing with clean water;

[0069] 2) Put the oil-removed workpiece in the pool for ultrasonic cleaning, the cleaning vibration frequency is 120KHz, the power density is set at 0.8W / C, and the ultrasonic cleaning time is 12min;

[0070] 3) Preheat the workpiece to 355°C, and the preheating time is 15 minutes;

[0071] 4) Put the workpiece in the nitriding furnace containing Li ion base salt, then extract the air in the nitriding furnace, and refill the mixed gas into the nitriding furnace

[0072] 5) Place the workpiece in a nitriding furnace with a base salt containing Li ions, raise the nitriding furnace to 550°C, and nitriding time is 93 minutes;

[0073] 6) Add solid sodium peroxide to the base salt, and...

Embodiment 3

[0087] A process for nitriding a metal surface, including a metal workpiece to be processed, the processing of the workpiece includes the following steps:

[0088] 1) Rinse the workpiece with water containing detergent, and then rinse the workpiece with 100°C water after rinsing with clean water;

[0089] 2) Put the oil-removed workpiece in the pool for ultrasonic cleaning, the cleaning vibration frequency is 160KHz, the power density is set at 1.0W / C, and the ultrasonic cleaning time is 15min;

[0090] 3) Preheat the workpiece to 385°C, and the preheating time is 25 minutes;

[0091] 4) Place the workpiece in the nitriding furnace containing Li ion base salt, then extract the air in the nitriding furnace, and refill the mixed gas into the nitriding furnace;

[0092] 5) Place the workpiece in a nitriding furnace with a base salt containing Li ions, raise the nitriding furnace to 580°C, and nitriding time is 100min;

[0093] 6) Add solid sodium peroxide to the base salt, and ...

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Abstract

The invention discloses a process for nitriding a metal surface, which includes a metal workpiece to be processed, and the processing of the workpiece includes the following steps: soaking the workpiece with water containing detergent, rinsing with clean water and immersing it in 100°C water Wash the workpiece; place the degreased workpiece in the pool for ultrasonic cleaning, the cleaning vibration frequency is 80-160KHz, and the power density is set at 0.6-1.0W / C; preheat the workpiece to 300-385°C, and the preheating time 6‑25min; place the workpiece in a nitriding furnace with base salt containing Li ions, raise the nitriding furnace to 520‑580°C, and nitriding time is 80‑100min; add sodium peroxide solid to the base salt , and the weight ratio of solid sodium peroxide to the weight ratio of the base salt is 1:2.5-4.5. In the present invention, by adding ultrasonic cleaning, it can quickly realize a strong cleaning effect on the workpiece during the cleaning process of the workpiece, so that the solid dirt on the surface of the workpiece is separated from the workpiece, so that it can effectively clean the workpiece during the nitriding process. Improve the effect of nitriding.

Description

technical field [0001] The invention belongs to the technical field of surface chemical treatment, and in particular relates to a process for nitriding a metal surface. Background technique [0002] The essence of QPQ (Quench-Polish-Quench, quenching-polishing-quenching) technology is low-temperature salt-bath nitriding + salt-bath oxidation or low-temperature salt-bath nitrocarburizing + salt-bath oxidation, which is a surface modification technology for metal parts , has the advantages of high corrosion resistance, high wear resistance and micro deformation. The surface of the workpiece treated by QPQ technology is Fe3O4 oxide film, and its corrosion resistance is much higher than the level of surface protection technologies such as chromium plating and nickel plating. Medium carbon steel can replace stainless steel in many fields after QPQ treatment. At the same time, the QPQ process can replace traditional anti-corrosion processes such as blackening, phosphating and nic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/58C23C8/24C23C8/02
CPCC23C8/02C23C8/24C23C8/58
Inventor 赵林国
Owner KUNSHAN SUNMIN DRILUBE ELECTRONIC MATERIAL TECHNOLOGY CO LTD
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