Stainless steel csk head screws factory teach you how to distinguish nickel plated screws and galvanized screws

In the fastener industry, there are many kinds of screw surface treatment. Taking Shi Shi Tong’s stainless steel csk head screws factory as an example, there are different surface treatment methods on the metal surfaces, such as vacuum electroplating, black coating, electrophoresis, galvanizing, and nickel plating, etc. There are many differences between different surface treatments, so how to distinguish between nickel-plated screws and galvanized screws of steel material?

Shi Shi Tong stainless steel csk head screws factory in the following to share three kinds of discrimination:

The first method is to distinguish directly according to the color of the screw’s appearance. The nickel-plated screw’s surface is very bright silver, and the galvanized screw’s appearance has black, white, yellow, colorful, and other different colors.

The second way is to use strong acids and strong bases. Nickel-plated screw’s surface has a passive film, so in strong acid and strong base, its erosion rate is relatively slow. And galvanized screw in the strong acid and alkali is very easy to corrode.

The third method is to compare the salt spray test time of the two screws. Nickel-plated screws can be tested for 24 hours by salt spray because of the passivation film, but zinc-plated screws can only be tested for 12 hours.

If you need to customize nickel-plated screws or galvanized screws, please contact Shi Shi Tong stainless steel csk head screws factory.

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