Shock absorber front fork tube surface treatment method

Abstract

The invention provides a shock absorber front fork tube surface treatment method. The shock absorber front fork tube surface treatment method comprises the steps of conducting infiltration treatment on the surface of a shock absorber front fork tube through a carbon-nitrogen-lanthanum-yttrium ion infiltration agent; conducting activation on the treated shock absorber front fork tube through a lanthanum-yttrium activation infiltration agent; conducting first-time oxygen ion infiltration treatment through an oxygen ion infiltration agent; conducting polishing after cooling and cleaning, and conducting second-time oxygen ion infiltration treatment through the oxygen ion infiltration agent; and finally, conducting sealing treatment through a sealing agent and then conducting oil immersion. Theshock absorber front fork tube is treated through the method. Firstly, the shock absorber front fork tube is subjected to infiltration treatment through the carbon-nitrogen-lanthanum-yttrium ion infiltration agent to form a compound layer and a diffusion layer with a certain thickness. The shock absorber front fork tube comprises carbon nitride compounds of metallic elements and a solid solutionof nitrogen in iron and has high hardness and corrosion resistance. Compared with a common chroming process, the shock absorber front fork tube surface treatment method has the advantages that the salt fog corrosion resistance is increased from 24 h of common chroming treatment to 240 h, and the corrosion resistance is improved by approximately 10 times; and meanwhile, the back-and-forth fatigue life is prolonged from 300000 times of the common chroming process to 1 million times.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a surface treatment method for a shock absorber front fork cylinder. Background technique [0002] As an integral part of the mechanical composition, the front fork tube of the shock absorber is used to suppress the shock when the spring rebounds after absorbing the shock and the impact from the road. It is widely used in automobiles, motorcycles and other vehicles to accelerate the attenuation of frame and body vibrations and improve the ride comfort of automobiles. The reliability of the front fork cylinder of the shock absorber depends on the structure and material of the front fork cylinder of the shock absorber. At present, the front fork cylinder of the shock absorber is mainly made of non-quenched and tempered steel through machining. [0003] At present, the surface treatment of most shock absorber front fork barrels is chrome-plated, and butt...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the prior art that the surface of the front fork cylinder of the shock absorber has poor corrosion resistance and the chrome-plated surface is easy to peel off during use, the present invention provides a surface treatment method for the front fork cylinder of the shock absorber