To meet the various requirements of the premise of increasing the use of progress, extend the life of galvanized steel, zinc coating materials are evolving. Major new coatings are:


(1) A zinc-iron alloy coating. That galvanized steel after heat treatment. Such as the diffusion annealing at 500 ~ 550 ℃ 10 ~ 15min, it will give the galvanized pipe in oilfield extend the life of nearly 9 times;


(2) Multiple or galvanized layer containing traces of alloying elements. Such as adding an appropriate amount of nickel can corrosion ability than that of pure electro-galvanized pipe progress more than 10 times;


(3) Composite coatings. That is by the use of the premise of the need, in galvanized steel coated with a layer of appropriate organic materials, such corrosion, high temperature resistance, cold resistance, wear resistance, impact resistance and increase flexibility, etc., we can further meet one or several higher requirements. If color coating, as well as decorations and flag effect.