After a long time of transportation, galvanized steel grating products appear a lot of white or gray powder on the surface of the original bright and smooth products, the products are blackened, and even rust spots appear in serious places. In fact, when freshly plated galvanized steel grating is stored and transported in a humid and poorly ventilated environment in a close-packed manner, white or gray powdery corrosion products will form on the surface of the coating. This corrosion product It is commonly referred to as white rust.
In most cases, white rust does not indicate that the steel grating coating has been severely damaged, nor does it necessarily mean that the service life of the galvanized steel grating will be reduced. After the occurrence of white rust, the original close-packed plated parts should be laid out to dry the surface quickly and inspected immediately.
When the white rust on the surface of the galvanized steel grating is slight, wipe off the rust with a dry cloth. Because in a humid environment, very slight white rust on the surface of the steel grating may also prevent the formation of a protective film of basic zinc carbonate corrosion products.
Moderately to severely corroded steel grating can be removed with a stiff brush, not a wire brush. After removing the white rust, the coating thickness of the white rust area must be checked to ensure that there is sufficient zinc coating protection.
The typical white and gray corrosion products may turn black on steel grating with white rust that has been stored for a long time. When this happens, it means that a large amount of zinc coating has been corroded, and the service life will be reduced. In extreme cases, due to long-term storage in harsh environments, serious white deposits or red rust are formed, which have damaged the service life of the steel grating, and must be re-plated or partially repaired according to the methods specified in the relevant standards.
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