Why electroplated carbon steel screws can pass the salt spray test

Publish time: 27 Mar 25

The salt spray test is a simulation of the surrounding environment, using a salt spray testing machine to artificially accelerate the salt spray environment to assess the anti-corrosion performance of electroplated carbon steel screws. It is well known that metal products will be oxidized in the air, with some taking a long time and others a short time. The salt spray test accelerates this process under the same environmental conditions and compares the degree of corrosion of carbon steel screws within the same time period to determine whether the product meets the usage requirements.

Artificial salt spray tests include neutral salt spray tests, acetic acid salt spray tests, copper salt-accelerated acetic acid salt spray tests, and alternating salt spray tests. The requirements for salt spray tests are generally proposed by customers based on the usage of their products. For example, carbon steel screws used in automobiles usually require salt spray tests to last for 72 to 148 hours.

It is known that the material of carbon steel screws does not have anti-rust and corrosion-resistant properties. If carbon steel screws are to have anti-rust and corrosion-resistant properties, the requirements for salt spray tests are related to the surface treatment of carbon steel screws, and surface processing is required. This isolates the carbon steel screws from the outside world, playing an anti-rust role. Therefore, electroplating treatment is needed, such as blackening, zinc plating, nickel plating, and zinc-nickel alloy plating, etc. Carbon steel screws that have undergone electroplating treatment are undoubtedly much better at anti-rust than raw materials.

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