Classification and Precautions for Surface Treatment of Zhuji Springs
2023-04-26
Zhejiang, a major production area for springs, enjoys a certain reputation within the industry for its springs. Zhejiang springs are categorized based on their surface treatment.
Spring surfaces can be treated with phosphating, a chemical and electrochemical reaction that forms phosphates. Phosphates form a phosphate layer on the surface, protecting the spring and providing anti-corrosion effects. Springs can also use bluing technology. Heating in concentrated caustic soda with added sodium nitrite under pressure forms iron oxide, which also protects the spring; its thickness is typically 1 millimeter.
In contrast to bluing is blackening. Heating steel directly in the air and placing it in sodium hydroxide forms an oxide layer on the surface to treat the spring. To ensure quality, spring surfaces are also polished and galvanized. Polishing uses mechanical, chemical, or electrochemical methods to reduce the surface roughness of the spring material, resulting in a better processing surface. Galvanizing treats the spring's surface, improving its appearance and providing rust prevention.
Another surface treatment method for Zhejiang springs is passivation—oxidation by a strong oxidizing agent transforms the active metal surface into a passive state.
Zhejiang springs utilize numerous surface treatment methods to provide more effective protection.
Usage Precautions for Zhejiang Springs
When using Zhejiang springs, certain precautions are necessary. Different springs have different specifications and must not be interchanged. The design and production of springs involve strict size requirements, with usage values precisely analyzed. Mixing them will affect the spring's performance; they must not be mixed or arbitrarily modified.
The selection of the spring's installation hole and the central shaft diameter is crucial for normal use; it secures and guides the spring. Insufficient guidance length can lead to bending and tilting. During normal use, the spring's guidance length should exceed half its free length to ensure accurate spring force control.
When installing the spring on upper and lower surfaces, these surfaces must remain parallel, and the joints and end faces must be flush. Springs that have been shortened or processed must also maintain parallel upper and lower surfaces. Furthermore, ensure the spring is free from impurities, which can impair its elasticity.
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