Hot-dip galvanized fasteners
Hot-dip galvanizing – bolts, screws, nuts, washers, etc. with the coating made by the hot-dip galvanizing method. Hot-dip galvanizing is widely used in fastener manufacturing as it prevents corrosion by offering barrier and galvanic protection to the base steel.
To be galvanized, fasteners are completely immersed in a molten zinc bathand held there until the temperature of steel equilibrates with that of the bath (complete immersion into molten zinc ensures excellent corrosion protection).The steel is cooled in a quench tank to reduce its temperature and inhibit undesirable reactions of the newly formed coating with the atmosphere.
The surface protective layer of molten zinc (from 30 to 60 µm) is resistant to shearing distortion, mechanical deformations and strokes. It guarantees cathodic protection to the base steel even after damage.Hot-dip galvanizing coating ensures long-term and maintenance free corrosion protection for more than 50 years.Average thickness of the galvanized coating 20-40 μm.