The difference between cold galvanized chain link fence and hot-dip galvanized chain link fence

First of all, compare the appearance of the chain link fence. The surface colors of the cold galvanized chain link fence and the hot-dip galvanized chain link fence are silver-white, which is almost the same, but you will find that the color of the electro-galvanized chain link fence is brighter. The color of hot-dip galvanized chain link fence is dark, and the zinc layer of hot-dip galvanized chain link fence is thicker than that of electro-galvanized chain link fence. Different from the product characteristics, electro-galvanized chain link fence is corrosion-resistant.

Galvanizing is a surface treatment technology. It refers to a zinc coating that is coated with a layer of zinc on the surface of metal, alloy or other materials for aesthetics and rust prevention. After the zinc coating is passivated, dyed or coated with a light protectant, its protective and decorative properties can be significantly improved.

The hot-dip zinc layer is formed in three steps when zinc is in the liquid state. The surface of the iron base is dissolved by the zinc solution to form a zinc and iron alloy phase layer; the zinc ions in the alloy layer further diffuse to the base to form a zinc and iron mutual dissolving layer; alloy layer The surface is covered with a zinc layer.

Cold galvanizing is also called electro-galvanizing. It uses electrolysis equipment to remove oil, pickling, and then put the pipe fittings into a solution of zinc salt, and connect the negative electrode of the electrolysis equipment. Place a zinc plate on the opposite side of the pipe and connect it to the electrolysis. The positive pole of the equipment is connected to the power supply, and the directional movement of the current from the positive pole to the negative pole will deposit a layer of zinc on the pipe fittings. The cold-plated pipe fittings are processed first and then galvanized.

The difference between the two galvanizing methods is mainly reflected in the process, and the technology used in surface treatment is different.

The use of different processes leads to differences in the performance of the two products.

Hot-dip galvanizing: It is difficult to dissolve in water, so it has a certain protective effect on the base of steel fasteners. If zinc oxide forms insoluble zinc salt with other components in the atmosphere, the anti-corrosion effect is more ideal; it has a zinc-iron alloy alloy layer, which is densely combined, and exhibits unique corrosion resistance in marine salt spray atmosphere and industrial atmosphere; due to the combination It is firm, zinc-iron is mutually soluble, and has strong wear resistance; because zinc has good ductility, its alloy layer is firmly attached to the steel matrix, so hot-dip galvanizing can be cold punched, rolled, wire drawn, bent, etc. The forming process does not damage the coating; after the steel structural parts are hot-dip galvanized, it is equivalent to one annealing treatment, which can effectively improve the mechanical properties of the steel matrix, eliminate the stress during the forming and welding of the steel parts, and is conducive to turning the steel structural parts; The surface of the fasteners after galvanizing is bright and beautiful; the pure zinc layer is the most plastic galvanized layer in hot-dip galvanizing. Its properties are basically close to pure zinc and have good ductility.

Cold galvanizing: The zinc coating is thicker, with fine crystallinity, uniformity and no porosity, and good corrosion resistance; the zinc coating obtained by electroplating is relatively pure, and it corrodes slowly in the mist of acid and alkali. It can effectively protect the substrate of the fastening sand. The zinc layer is passivated by chromic acid to form white, colored, military green, etc., which is beautiful and has a certain decorativeness. Because the galvanized layer has good ductility, it can be cold stamped, rolled, bent, etc. Forming without damaging the coating.

Performance differences will have their own application areas.

Hot-dip galvanizing is suitable for all kinds of strong corrosive environments such as strong acid and alkali mist.

Cold galvanizing is used in machinery manufacturing, making galvanized chain link fence, electronics, precision instruments, chemicals, transportation, aerospace, etc.