Galvanizing process: what is it?What are its advantages?
The galvanizing process is a technique that is used to protect steel from corrosion for more than 250 years. Corrosion is caused by an inherent tendency of metals when subjected to air and moisture, which tend to return to their original earthly form, usually a state of mineral. They do it through a chemical or electrochemical reaction with the environment.
Galvanizing consists of the immersion of steel parts in molten zinc to protect them from corrosion and enhance their mechanical strength against shocks and abrasion. Many confuse galvanizing with zinc plating, and in fact many sources speak of them as synonyms, but these are different techniques, determined by the use that will be given to the material, and that is why they are governed by different UNE standards.
Galvanizing process and zinc plating process
The galvanizing process can be hot, immersion or fire. It consists of introducing molten zinc steel parts, at an approximate temperature of 450 ° C until a 7-42 micron coating (low coating, regulated by UNE EN ISO 10346) or 45-200 microns (high duration) is achieved. , regulated by the UNE EN ISO 1461 standard). When zinc is metallurgically alloyed with steel, a layer is created that has great adhesion, is very resistant to shocks and is very hard, especially suitable for outdoor use and in humid or corrosive environments.
The zinc plating process is an electrodeposition process, similar to chrome plating or copper plating, also sometimes called (erroneously) cold galvanized, where the zinc layer is 5-20 microns, and is governed by the UNE EN ISO 2081 or UNE EN ISO 10152. Since this layer is thinner than galvanized, it is usually a suitable procedure only for interiors, and the pieces are softer and more uniform, increasing their aesthetic value. Therefore, sometimes we talk about small pieces of galvanized electronics, for example, when they are actually galvanized. If they go through a passivation process, however, the protection is increased, but they will not achieve the level of protection of the galvanized, unless they are especially expensive treatments.
Galvanizing consists of the immersion of steel parts in molten zinc to protect them from corrosion and enhance their mechanical strength against shocks and abrasion. Many confuse galvanizing with zinc plating, and in fact many sources speak of them as synonyms, but these are different techniques, determined by the use that will be given to the material, and that is why they are governed by different UNE standards.
Galvanizing process and zinc plating process
The galvanizing process can be hot, immersion or fire. It consists of introducing molten zinc steel parts, at an approximate temperature of 450 ° C until a 7-42 micron coating (low coating, regulated by UNE EN ISO 10346) or 45-200 microns (high duration) is achieved. , regulated by the UNE EN ISO 1461 standard). When zinc is metallurgically alloyed with steel, a layer is created that has great adhesion, is very resistant to shocks and is very hard, especially suitable for outdoor use and in humid or corrosive environments.
The zinc plating process is an electrodeposition process, similar to chrome plating or copper plating, also sometimes called (erroneously) cold galvanized, where the zinc layer is 5-20 microns, and is governed by the UNE EN ISO 2081 or UNE EN ISO 10152. Since this layer is thinner than galvanized, it is usually a suitable procedure only for interiors, and the pieces are softer and more uniform, increasing their aesthetic value. Therefore, sometimes we talk about small pieces of galvanized electronics, for example, when they are actually galvanized. If they go through a passivation process, however, the protection is increased, but they will not achieve the level of protection of the galvanized, unless they are especially expensive treatments.
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