Hot-dip galvanized screw refers to a fastener product with a bright appearance and a certain anti-rust ability after the screw is degreased, decontaminated and galvanized on the surface of the screw. It is a common surface treatment method for fastener screw products. The screw is mounted in a special electroplating bath on the cathode and the anode is zinc. Connect the DC power supply, the zinc ions on the anode migrate to the cathode, and discharge on the cathode, so that the screw is coated with zinc, and the surface of the galvanized screw is smooth and flat. Usually, the thickness of the zinc layer is less than 5-10 microns, so the corrosion protection time is relatively short. For rust prevention of interior components such as chassis, panels, small size fasteners, etc.

In the production of hot dip galvanized nuts, the first step is to expand the hole by 40-60 threads as the nut hits the teeth. Put the nut in the zinc solution above 500 degrees, so that the surface of the nut adheres to the zinc solution. Generally speaking, the thickness of the zinc layer of hot-dip galvanized nuts is not less than 50 microns, so as to play the role of anti-corrosion and anti-rust. After completion, the hot-dip galvanized nuts cannot be trimmed to prevent the zinc layer from falling off and affecting the anti-corrosion performance. The surface finish of hot-dip galvanized nuts is usually slightly worse than that of ordinary nuts, but the rust resistance is much higher than that of ordinary nuts.

www.junlygroup.com