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Nitrogen and carbon co-permeation -oxidation composite treatment process of automobile shock absorber piston rods

A car shock absorber and nitrocarburizing technology, which is applied in the field of metal component manufacturing and processing, can solve the problems of thin treatment layer and cannot meet the service requirements of piston rods, so as to improve corrosion resistance and wear resistance, improve The effect of thickness

Inactive Publication Date: 2018-12-07
TONGFU HEAT TREATMENT KUNSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nitrocarburizing can endow the workpiece with excellent wear resistance and corrosion resistance, but the thickness of the treated layer formed is too thin to meet the service requirements of the piston rod

Method used

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  • Nitrogen and carbon co-permeation -oxidation composite treatment process of automobile shock absorber piston rods
  • Nitrogen and carbon co-permeation -oxidation composite treatment process of automobile shock absorber piston rods
  • Nitrogen and carbon co-permeation -oxidation composite treatment process of automobile shock absorber piston rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of nitrocarburizing-oxidation compound treatment process of piston rod of automobile shock absorber, its process steps are as follows:

[0031] Step 1, Cleaning: Clean the workpiece automobile shock absorber piston rod for 2 seconds under the action of water temperature 45°C, cleaning agent concentration 7%, and current density 150A, and dry the surface moisture at 250°C;

[0032] Step 2, pre-oxidation: heating the workpiece in an air furnace for 50 minutes at a temperature of 420°C;

[0033] Step 3, nitrocarburizing: place the pre-oxidized workpiece in a furnace body at 565°C, and continuously inject a certain proportion of ammonia and carbon dioxide for 360 minutes;

[0034] Step 4, Oxidation: Place the workpiece in a furnace at 480°C, continuously inject a certain amount of water vapor, and treat for 60 minutes;

[0035] Step 5, secondary oxidation: place the workpiece in a furnace at 500°C, continuously inject a certain amount of water vapor, and treat for 4...

Embodiment 2

[0038] A kind of nitrocarburizing-oxidation compound treatment process of piston rod of automobile shock absorber, its process steps are as follows:

[0039] Step 1, Cleaning: Clean the workpiece automobile shock absorber piston rod for 3 seconds under the action of water temperature of 60°C, cleaning agent concentration of 8%, and current density of 180A, and dry the surface moisture at 280°C;

[0040] Step 2, pre-oxidation: heating the workpiece in an air furnace for 60 minutes at a temperature of 430°C;

[0041] Step 3, nitrocarburizing: place the pre-oxidized workpiece in a furnace at 580°C, and continuously feed a certain proportion of ammonia and carbon dioxide for 380 minutes;

[0042] Step 4, Oxidation: Place the workpiece in a furnace at 500°C, continuously inject a certain amount of water vapor, and treat for 70 minutes;

[0043] Step 5, secondary oxidation: place the workpiece in a furnace at 500°C, continuously inject a certain amount of water vapor, and treat for...

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Abstract

The invention discloses nitrogen and carbon co-permeation-oxidation composite treatment process of automobile shock absorber piston rods. The nitrogen and carbon co-permeation-oxidation composite treatment process comprises the following steps of cleaning, at the temperature of 40-60 DEG C, the concentration of the cleaning agent is 6-8%, the automobile shock absorber piston rod is cleaned for 2-3S under the action of the current density of 144-180 A, and drying the surface water at the temperature of 220-280 DEG C; pre-oxidation, heating the workpiece in an air furnace at 410-450 DEG C for 50-60 minutes; performing nitrogen and carbon co-permeation, the pre-oxidized workpiece is placed in a furnace body at the temperature of 560-580 DEG C, and continuously introducing ammonia gas and carbon dioxide in a certain proportion to treat for 360-380 minutes; oxidation, putting the workpiece into a furnace body with the temperature of 480-500 DEG C, continuously introducing a certain amount of water vapor, and treating for 60-70 minutes; secondary oxidation, placing the workpiece in a furnace body with the temperature of 500-520 DEG C, continuously introducing a certain amount of water vapor, and treating for 40-50 minutes; and performing oil immersion and drying, soaking the workpiece in the lubricating oil for 15-20 minutes, taking out and naturally dripping and drying. After the automobile shock absorber piston rods are processed through the process, the thickness of the processing layer is greatly increased, so that the wear resistance and the corrosion resistance of the workpiece are further improved.

Description

technical field [0001] The invention belongs to the field of metal component manufacturing and processing, and in particular relates to a nitrocarburizing-oxidation composite treatment process for a piston rod of an automobile shock absorber. Background technique [0002] As one of the core components of the automobile shock absorber system, the piston rod of the automobile shock absorber is required to have excellent wear resistance and corrosion resistance. The common treatment process of piston rod is chrome plating on the surface, but chrome plating will produce a large amount of harmful wastewater containing chromium ions, and the treatment of wastewater requires a lot of manpower and financial resources. Today, with increasing environmental protection requirements, it is urgent to find a new surface treatment method to replace the chrome plating process on the surface of the piston rod. [0003] Nitrocarburizing, also known as nitrocarburizing, is a heat treatment pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/30C23C8/16
CPCC23C8/16C23C8/30
Inventor 郑志伟顾晓文肖伟祥赵玉宝靖智立
Owner TONGFU HEAT TREATMENT KUNSHAN