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Metal surface nitriding technology

A technology for metal surfaces and metal workpieces, which is applied in the field of surface chemical treatment, can solve problems such as limited effects, and achieve the effects of improved effects, fast cleaning effects, and high reaction efficiency

Active Publication Date: 2019-09-13
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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Examples

Experimental program
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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 metal surface nitriding technology. The metal surface nitriding technology involves a to-be-processed metal workpiece, and processing of the workpiece comprises the followingsteps of carrying out immersion cleaning on the workpiece with water containing detergent, carrying out immersion cleaning on the workpiece with water at 100 DEG C after the workpiece is washed withclear water, and placing the oil stain-removed workpiece into a pool for ultrasonic cleaning, wherein the cleaning vibration frequency is 80-160 KHz, the power density is set at 0.6-1.0 W / C, the workpiece is preheated to 300-385 DEG C, and the preheating time period is 6-25 minutes; placing the workpiece in a nitriding furnace containing base salt containing Li ions, raising the temperature of thenitriding furnace to 520-580 DEG C, wherein the nitriding time period is 80-100 minutes; and adding sodium peroxide solid into the base salt, wherein the weight ratio of the solid sodium peroxide tothe base salt is 1 to 2.5-4.5. According to the technology, by adding ultrasonic cleaning, in the process of cleaning the workpiece, a strong cleaning effect on the workpiece can be rapidly realized,so that solid dirt on the surface of the workpiece is separated from the workpiece, and the nitriding effect can be effectively improved in the nitriding process.

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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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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