The hot-dip galvanized layer is formed by zinc in liquid state in three steps, and the elbow surface is dissolved with zinc liquid to form a zinc-ferroalloy phase layer; The zinc ions in the alloy layer further diffuse into the elbow matrix to form a miscible zinc-iron layer. The alloy layer is coated with a layer of zinc.
Galvanized elbow is to put a layer of zinc on the surface of the elbow to play a beautiful rust-proof and other function. The main method used now is hot dip galvanizing.
The hot-dip galvanized layer is formed by zinc in liquid state in three steps, and the elbow surface is dissolved with zinc liquid to form a zinc-ferroalloy phase layer; The zinc ions in the alloy layer further diffuse into the elbow matrix to form a miscible zinc-iron layer. The alloy layer is coated with a layer of zinc. The hot-dip galvanized elbow has a thick and dense layer of pure zinc covering the surface of the elbow, which can prevent the elbow from contacting any corrosion solution and protect the elbow matrix from corrosion. In the general atmosphere, a thin, dense layer of zinc oxide forms on the surface of the zinc layer. It is difficult to dissolve in water, so it plays a protective role on the elbow. If zinc oxide and other components of the atmosphere form insoluble zinc salts, the effect is ideal.
Cold galvanizing, also known as electrogalvanizing, is the use of electrolysis equipment to degrease, stripping, and then put into the zinc salt solution, and connect the negative electrode of the electrolysis equipment, place a zinc plate on the side opposite of the pipe fittings, connect to the positive electrode of the electrolysis equipment to turn on the power supply, the use of current from the positive electrode to the directional movement of the negative electrode will deposit a layer of zinc on the pipe fittings, the fittings Cold galvanized pipe are processed first and then galvanized. The zinc coating is thick, the crystallization is fine, uniform and non-porous, and the properties are good; The zinc layer obtained by electroplating is more pure, the corrosion is slower in acid, alkali and other mists, protecting the elbow matrix, the galvanized layer is passivated by chromic acid to form white, color, army green, etc., beautiful and generous, with decoration, because the galvanized layer has good ductility, so it can be cold stamped, laminated, bent and other shapes without damaging the coating.
