Surface treatment to make black concrete nails

There are many surface treatment processes for nail fasteners, among which black nails are our common nail surface treatment processes. Although the black nails are only made by turning the nails into black through nail surface treatment, the treatment methods to achieve the effect of black nails are also different.

In order to let the purchasers know more about the characteristics of black nails, the following is a brief introduction of the surface treatment process of black nails? 

The surface treatment process of black nails includes boiled black, oxidation blackening, and phosphating blackening. 

Boiled black, is to directly boil metal parts such as nails and fasteners in a special potion. It is oxidized at high temperature to obtain a black oxide film on the surface of the nail. When finished, its finished product looks beautiful. It also has a certain anti-rust performance, but the anti-rust performance is not strong, and it will rust within an hour of the salt spray test. If a sealing agent is added, the anti-rust oil can properly delay the time of the salt spray test.

Oxidation blackening is also a commonly used surface treatment method. This treatment method is to immerse the nail fastener in a strong oxidizing chemical solution. After a certain period of time, a layer of more beautiful and dense black iron oxide film is formed, which also has a certain anti-rust ability. If you want to increase the surface gloss and beauty of nail fasteners, and eliminate the internal stress after quenching.

Phosphating and blackening, immersing nail fasteners in phosphating solution, a layer of water-insoluble crystalline phosphate conversion film will be deposited on the surface of the nail, and the corrosion resistance of phosphating and blackening is better than the previous two kinds of corrosion resistance The performance is much stronger.

No matter which treatment method you choose, although the finished nails are black nails, the appearance and performance are different. Customers need to choose different surface treatment methods according to actual usage conditions.