As precision micro screws, small screws are widely used in our daily lives. Whether it is electronic products, watches, glasses, or mobile phones, they are inseparable from the existence of small screws. However, some small screws are prone to discoloration during use. This is due to the following reasons:
The characteristics of small screws are drilling and tapping, which have strong binding force and can be tightened once locked. However, some black stainless steel screws are prone to fading. This is because these screws that are easy to fade are electroplated with black zinc, and the characteristics of stainless steel make it difficult for the surface of stainless steel screws to be electroplated with black zinc. Therefore, in order to make stainless steel screws appear black, the surface blackening process is often used.
The surface of stainless steel screws itself is usually bright and does not require special surface treatment, unless there are parts with special requirements for appearance. For products with consistent appearance requirements, such as screws that need to match the color of the product workpiece, surface treatment of stainless steel screws is required. However, electroplated black zinc is not recommended, so other surface treatments need to be chosen.
Common stainless steel screw surface treatment methods include anodizing, zinc plating, chromium plating, stainless steel chemical nickel plating, etc. Among them, oxidation blackening is a very popular treatment method in industrial screw fasteners.
To sum up, small screws have the characteristics of drilling and tapping in common applications, which can quickly tighten and save construction time. However, some black stainless steel screws are easy to discolor because their surfaces are electroplated with black zinc, and the characteristics of stainless steel limit the application of electroplated black zinc. In order to achieve the black effect, the surface blackening process is often used. For parts with consistent appearance requirements, other surface treatments can be selected, such as anodizing.
