Fasteners, as important elements for connecting and fixing mechanical components, have a wide range of applications in the industrial field. In order to improve the performance and aesthetics of fasteners, surface treatment is often necessary. Among them, black zinc plating and blackening are two common surface treatment processes.
Author: Marisa
Fasteners, as important elements for connecting and fixing mechanical components, have a wide range of applications in the industrial field. In order to improve the performance and aesthetics of fasteners, surface treatment is often necessary. Among them, black zinc plating and blackening are two common surface treatment processes. Although they can all give fasteners a black appearance, there are significant differences in processing principles, performance characteristics, and applications.
I、 Processing principle
1. Black zinc plating
Black zinc plating is an electroplating process that involves depositing a layer of zinc metal on the surface of fasteners. After galvanizing, the zinc layer is transformed into black through specific chemical reactions, forming a dense black oxide film. This oxide film is not only aesthetically pleasing, but also provides a certain level of corrosion resistance.
2. Blackening
Blackening treatment is a chemical oxidation process that uses specific chemical agents to cause oxidation reactions on the surface of fasteners, forming a black oxide film. This type of oxide film is usually thin and mainly serves a decorative purpose, with limited improvement in anti-corrosion performance.
II、 Performance characteristics
1. Black zinc plating
Fasteners coated with black zinc have a smooth surface and uniform color, with a thick black oxide film layer and strong corrosion resistance. In addition, due to the presence of the zinc layer, fasteners coated with black zinc also have certain wear resistance and impact resistance.
2. Blackening
The surface roughness of fasteners treated with blackening is relatively high, and the color may not be uniform. Although blackening can improve the aesthetics of fasteners, its corrosion resistance and wear resistance are relatively weak due to the thin oxide film layer.
III、 Application scenarios
1. Black zinc plating
Due to the good corrosion resistance and wear resistance of fasteners coated with black zinc, they are suitable for harsh working environments such as marine environments, chemical equipment, etc. In addition, fasteners coated with black zinc are often used in applications that require high aesthetic appeal, such as automotive, electronics, and other industries.
2. Blackening
Blackened fasteners are mainly used in general working environments, such as mechanical equipment, building facilities, etc. Due to its low cost and simple operation, blackening treatment is widely used in situations where aesthetics are not high but fastener performance is required.
In summary, there are significant differences in the processing principles, performance characteristics, and application scenarios between fasteners coated with black zinc and blackened. When selecting the surface treatment process for fasteners, the appropriate process method should be chosen based on actual needs and working environment.