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AboutOur company mainly deals in springs, tension springs, torsion springs, and irregular springs; Spring steel wire; Metal forming; Steel wire products; Over the years, the company has consistently adhered to the principle of seeking development through service, and has established a sound business operation mechanism for irregular springs.
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ProductsOur company mainly deals in springs, tension springs, torsion springs, and irregular springs; Spring steel wire; Metal forming; Steel wire products; The irregular spring has made significant progress.
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RecruitmentOur company mainly deals in springs, tension springs, torsion springs, and irregular springs; Spring steel wire; Metal forming; Steel wire products; Irregular springs have made significant progress in development
How to treat the surface rust prevention of stainless steel tension springs?
Release time:
Feb 01,2023
Source:
Most stainless steelTension springUsed in different types of corrosive environments, the surface of tension springs can be subjected to varying degrees of corrosion due to chemical and electrochemical corrosion, leading to premature failure. Therefore, anti-corrosion treatment is necessary. The anti-corrosion treatment for tension springs involves covering the spring surface with a layer of anti-corrosion material to form a protective layer, isolating the spring from corrosive media to achieve anti-corrosion purposes. There are three common anti-corrosion methods for tension springs: electroplating, oxidation, and painting. Electroplating is an effective method for obtaining a protective layer on metal surfaces and is the main method for anti-corrosion treatment of springs. Its characteristics include good adhesion, fine and dense crystals, low porosity, uniform thickness, and good physical, chemical, and mechanical properties, including electroplated zinc, chromium, copper, tin, and nickel. A common application is galvanization.
The galvanized surface of tension springs is usually white or colored. Zinc remains almost unchanged in dry air but forms a white zinc oxide film in humid air or water containing carbon dioxide, which can inhibit corrosion. The galvanized layer is suitable for various atmospheric conditions; however, zinc's corrosion resistance is poor in acidic, alkaline, saline aqueous solutions and pure marine atmospheric conditions.
Galvanization features low cost, simple process, and good effectiveness. It is widely used for the anti-corrosion of medium and small springs in the atmosphere. After galvanization, springs should undergo passivation and dehydrogenation treatment to enhance their corrosion resistance and avoid hydrogen embrittlement. Small springs are particularly susceptible to hydrogen embrittlement; therefore, special attention should be paid during pickling and electroplating. Oxidation treatment of springs is also known as bluing or blackening. After oxidation treatment, a protective magnetic iron oxide forms on the spring surface. However, due to the thin film and numerous gaps, its protective capability is poor. Thus, oxidation treatment can only be used to prevent corrosion in less corrosive media.
Due to its low cost, simple process formula, high production efficiency, and no impact on spring characteristics, oxidation treatment is widely used for surface anti-corrosion of cold-formed small springs. In addition to oxidation treatment, phosphating treatment is also available; phosphating films are relatively stable under atmospheric conditions and have higher corrosion resistance than oxidation treatment. Painting is also one of the main methods for spring anti-corrosion and is used for medium and large springs, especially hot-formed springs and leaf springs. The coatings for tension springs mainly include asphalt paint, phenolic paint, and epoxy paint. For some important springs, a process of phosphating followed by painting is adopted to improve paint adhesion and corrosion resistance. Common coating methods include spraying and dipping. With technological advancements aimed at improving work efficiency, paint utilization rate, and paint quality, new technologies such as electrostatic spraying will be promoted.
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