The word’galvanizing’broadly identifies an electro-deposition process in which a thin layer of another metal is put into something manufactured from steel. The goal of galvanizing is to safeguard the bottom steel by preventing rusting. However, one of the most effective galvanizing methods does not employ any electrochemical deposition. It is recognized as hot dip galvanizing or simply HDG.
Hot dip galvanizing is becoming widely popular owing to its effectiveness as it pertains to corrosion protection. In reality, in recent times, the definition of “galvanizing” is being used to make reference to hot dip galvanizing. In this process, a four-layer corrosion resistant finish or surface is produced on a metal base using zinc by an electrochemical process. The metal (usually steel and iron) to be protected from corrosion is passed via a molten bath of zinc at a temperature of 460 degree centigrade. Zinc bonds to steel at the molecular level. Of four layers created, while the utmost effective layer is zinc, the three layers underneath are made up of zinc-iron alloy. HDG is being extensively used for industrial applications requiring the effectiveness of steel and effective resistance to corrosion.
Hot dip galvanizing has proven to be a lot more superior when compared to other methods like use of paint, metallizing, mechanical galvanizing or electroplate galvanizing. It has emerged as you of the very most result-oriented and reliable techniques that meets all your galvanizing requirements galvanizing services. Unlike electroplate galvanizing (which is regarded as the first type of galvanizing), HDG produces a much thicker, durable coating which makes it suited to even outdoor applications. On another hand, the thin coating made by electroplating is a lot quicker consumed, exposing the steel base to corrosion.
HDG results in superior protection from corrosion or rusting. The hard zinc-steel alloy layers offer a highly effective barrier. If this barrier is damaged, zinc acts as a sacrificial anode; the electrons in the zinc coating will sacrifice themselves to avoid corrosion. Additionally, the topmost layer comprising only zinc, when reacts with the oxygen, moisture and co2 in the air, forms a slim but hard film called the zinc patina (which is in fact an impermeable layer of zinc carbonate). It acts as a highly effective barrier within the galvanized zinc coating and protects it from corrosion. Zinc is more reactive than iron or steel and therefore the zinc galvanized coating corrodes first, protecting the bottom metal.
Because hot dip galvanizing contributes to bonding of zinc to steel at a molecular level, the galvanized coating easily covers the whole surface, including joints, scratched and holes. HDG is widely used in several applications ranging from automotive areas of the body, handrails, consumer appliances to roofing and walling. Because of its superior corrosion resistant properties, HDG is increasingly used to safeguard the outside automotive parts and panels. Hot-dip galvanized steel strip can be commonly used in metal pails, and heating and cooling duct systems in buildings.