中文版Galvanization
The galvanization is refers to, in includes wants the plating ion in the solution, take is plated the material or the goods as the negative pole, through the electrolysis, then obtains coating on the substrate surface. In the electrolysis process, between the electrode and the electrolyte on the contact surface has the chemical reaction, the anode release electron has the oxidizing reaction, the negative pole absorption electron has the electronation reaction. The galvanization may covers one for the material or the goods to be even and to have good binding force coating, changes its character of surface and the outward appearance, achieves the material protection or the decoration goal. When galvanization must use the direct current (low voltage, big electric current), and can the suitable controlling current density and the circular telegram time obtains needs the coating thickness.
Corrosion resistance coating commonly used zinc, cadmium, copper, nickel alloy and so on and so on metals or zinc nickel, nickel tin, nickel silver, copper zinc, form time couple's electrode potential based on coating and the parent metal to be different, separable anode coating and negative pole coating two kinds. In the corrosive medium Chungyang polarity coating electric potential compared to the parent metal negative, for example in the steel galvanizes or the cadmium, when coats has the breakage, coating as the anode will dissolve, has the electrification protective function regarding the steel products, namely “the sacrifice” guarantees attains the function, coating is thicker, the protective function is bigger.
The negative pole coating electric potential compared to the parent metal correction, for example in the steel aluminum-plates, the copper, the nickel, when coats has the breakage, coating can accelerate corrosion of the parent metal exposition part, only when complete imperviousness can have the protective function, therefore coating should pay attention to its compactness and not have the breakage, but protects ability to decide its factor of porosity, the factor of porosity is low, the protective function is big, its corrosion prevention effect uses the coating isolation external environment, causes the corrosive medium to be unable to seep to the parent metal.
The hot dipping plates
The hot dipping plates is plated to plunge fusing in the molten metal, causes its surface to form coating the method. The hot dipping coating metal's melting point must be much lower than the parent metal, for example zinc, aluminum, lead and alloy. May result in quite thick coating with the hot dipping law, usually is thick in the similar galvanization, and the hot dipping plating very few sparse holes, hot dipping type coating same galvanization coating, has the good corrosion resistance generally. In the same corrosion environment, the hot dipping type coating service life is long, and has the strong binding force. But this method control coating thickness is quite difficult, usually coats above thickness 50g/m2 to plate the law by the hot dipping to be easy to obtain, but below 50g/m2 coating thickness by the galvanizing process may economical acquisition. Hot dipping of the success plates the law, must combines to form mutually the base metal and the coating metal the alloy, arrives at some kind of degree at least, plates the law by the hot dipping to obtain coating, not only by uses of jacket the ingredient, in the Crystallization Organization, hot dipping type coating has two at least, one for the inner layer type alloy diffusion layer, one for outer layer type coating, the outer layer basically with executes the ingredient has not served as when coating has the same nature, the inner layer diffusion layer is very often hard crisply, after curve possibly sheds skin or splits, therefore processing cannot distort too, the processing institute can endure the distortion procedure, decided that it uses the metal, coating andOther factors, therefore product often after distortion processing the hot dipping plates again.
