Discovering more about hot-dip galvanized technology for mechanical products

Current mechanical products, to ensure about the safety of quality, environmental durability as well as aesthetics, are normally hot-dip galvanized. So, what is hot-dip galvanized technology? Please see the artilce below

What is Hot-dip galvanization?

Hot-dip galvanization is one of surface technologies by coating the metal surface with a thin layer of zinc by dipping protective metal whose surface has treated into a molten zinc bath. Hot-dip galvanization is still called zinc-plating. Of all the common surface finishing techniques for steel, zinc-plating is the best method of creating a rustproof surface. During zinc-plating, the metal is cooked into a metal alloy with a substrate. So zinc-plating player will not be peeled as using paint in order to create eternal protection layer for the substrate.

History of hot dip galvanizing technology:

In 1742, when a French chemist named Melouin, in a presentation at the French Academy, described a scheme of detailed surface protection of the steel by immersing it into a molten zinc tank.

In 1836, Sorel - a French chemist achieved a patent about protection scheme  of steel surface by zinc-coating layer by immersing components into molten hot zinc tank after having done detailed surface with Sulfuric acid 9% and immersing through Amonium Chloride. Another patent of England is also approved in 1837.

Since 1850, each year with hot-dip zinc-plating in England, there are 10,000 tons of zincs for  protecting steel and iron. Hot-dip zinc-plating for protecting the surface of steel and iron applied widely in most of fields in the economy such as electrical transmission, transportation, paper mills, chemical plants,…

Over the past 150 years, hot-dip galvanizing has proven for a successful history in commerce as an anti-corrosive method in a multitude of applications around the world.

Value of Hot-dip galvanization:

Using protective coating (or protecting barriers) to isolate the metal surface from contacting with the capacitor in the external environment is the oldest method and is the most widely used in protecting from anti-corrosion. The two most important attributes of barrier protection layer are adhesion to metal substrate surface and durability of coating. Paint is a typical example of barrier protection. Cathode protection is an important method of anti-corrosion, the feature of cathode protection is making elements of corrosive circuit change, create an element of new corrosive circuit and ensure that substrate metal becomes a Cathode element of this circuit. Hot-dip zinc-plating is the method which supplies two ways of protecting from corrision: barrier protection and cathode protection.

Zinc has been used to create a protective layer due to its properties (the corrosion rate of Zn is from 40-50g/m2/year compared to 400-500g/m2/year of steel, Zn with voltage + In comparison with Fe in the process of electrochemical corrosion ...), in terms of principle, whether it is created in any methods: Electrolytic galvanizing, hot-dip galvanizing, plating spraying, the decesive factor for the life of Zn procective layer is the thickness of coated Zn layer. With its superior features about protective surface coating, hot-dip galvanizing is showing useful value. Hot -dip galvanizing technology ensures the quality of construction steel structures in the period of industrialization and modernization of the country.

Create protective layers for metal structures in air, marine, industrial gas environments…

Zinc coatings after being dry have two protective functions:

The first function is the function of passive protection with metal protection membrane as the types of traditional paint;

The second function is active protection which means the Cathodic protection anti-corrosion function, this function has protective layer made of hot-dip galvanizing.

Restore abrasive components: refreshing the surface of the product when being exposed to environmental factors.

Create an anti-wear coating on new details.

Create a decorating coating on plastic, wooden coating…

The most popular is creating zinc/ aluminum coating to anti-corrosion in different conditions.



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