Galvanizing: also called hot dip zinc and hot galvanizing, is an effective way of metal corrosion protection, mainly used for metal structure industry facilities. around 500 ℃ after rust removal of steel in zinc melt liquid, make the zinc layer is adhered on the surface of the steel members, thereby the purpose of anticorrosive.
Cold galvanized (galvanizing) also called electro-galvanized cold galvanizing, which is the use of the pipe member through electrolysis degreasing, pickling, and put into a solution composed of zinc and a cathode connected to the electrolytic apparatus, placed opposite the tube member zinc plate, connected to the electrolysis the positive power equipment, the use of electric current from the positive to the negative directional movement will be in a layer of zinc deposited on pipe fittings, cold-plated fittings are galvanized after processing the first.
Cold galvanizing paint mainly through electrochemical principles for corrosion, it is necessary to ensure full contact of zinc powder and steel, generating electrode potential difference, so the steel surface treatment is very important.
Cold galvanizing process is used to protect the metal against corrosion, for the use of filler coatings of zinc, in the use of any method to a coating applied to the surface to be protected, the filler form zinc coating after drying, the dried coating having a content of zinc (95%). Suitable for repair work (ie work in the repair process, the only damage to the steel surface to be protected place, as long as the repaired surface can be re-coated). Cold galvanizing process for a variety of steel products and structures corrosion. (Cold galvanizing is galvanized, galvanized rarely, and only 10-50g/m2, its own hot-dip galvanized corrosion resistance than a lot of difference. Using galvanized the price is relatively cheaper.
1, anticorrosive, hot dip galvanized is dozens of times of cold galvanizing.
2, vary in their manner of operation: hot dip galvanized is in 450-480 degrees of molten liquid zinc in zinc plating, plating is cold at room temperature by electroplating of zinc plating or other methods.
3, galvanized layer thickness is different, hot dip galvanized thickness is much larger than cold galvanizing.
4, surface smoothness, cold galvanized than galvanized smooth good-looking appearance.
5, the price is different, hot dip galvanized cold galvanizing.
6, cold galvanized can only side plating, hot dip galvanized for plating.
7, adhesion, adhesion of cold galvanizing is inferior to hot dip galvanized.
8, fee standards is different, hot dip galvanized according to the thickness of the material fee, cold most of the plating charge according to square meters.
Hot galvanizing technology mainly use range: industry, construction, electric power, chemical industry, machinery manufacturing, petroleum, municipal facilities, agricultural facilities, communication facilities, fire facilities, railway, highway and transportation facilities and other fields.