Know about the galvanized methods to anti-resistant

In many methods, the galvanized solution provides the rust-resistant ability comprehensively. The perfect operation mechanism of galvanized technology protects greatly iron-steel, ...

Every year, nearly a half zinc volume of the world is used to protect steel that faces to the most ferocious enemy that is rust and corrosion that every year tens, millions of iron-steel tons are swallowed. Countries have to spend a huge cost for the metal corrosion resistance of constructions.

Why we must galvanize for metal against rust

In developed industrialized countries, the cost of the fight against rust and corrosion accounts for an average of about 4% of the country's annual GDP. With weather conditions is the high humidity of the climate that is a favorable condition for the process of corrosion.

Under the impact of the environment, metal erosion, corrosion in the air, in the soil or in wetlands make work life quickly deteriorated. The uneven layer, the most dangerous forms are leakage points, leakage losses reduce the load-bearing ability of the structure. There is also the perception that the reinforced concrete structures from corrosion, but from theory to practice, the reinforced concrete structures badly are damaged by reinforcement of corrosion, causing swelling, can increase inside the area, Lose the link between steel and concrete reduces the load-bearing capacity and longevity works.

The works by the foreign investor, the protection measures against corrosion are being noticed and valued. In our country, the cost of protection against corrosion is very low, usually for the cost of primer method normally should not work at all after a few years of use had to upgrade and maintain.
Currently, on the market, there are many methods of corrosion resistant metal, but useful method widely used is sputtering a metal layer.
 

SPUTTERING METALS (THERMAL SPRAY METALLIC)

Today we can see that zinc is used everywhere in the world. That is used to protect metals such as electrolytic plating, hot dip galvanized or zinc spray ...

Spraying molten zinc plating is combustion of molten zinc and spray it by air pressure line with a large volume of small metal particles with high-velocity object surface, thereby able to create on the surface and coating material evenly and continuously.

There are several methods of burning molten zinc (with electric current, by combustible gases, by plasma flows ...), so this technology is divided into arc spraying, spraying burning gas, plasma spray ...

Currently, arc spray method is widely used due to low cost, high-quality coatings, simple device. This is also the convenience factor for this technology to be applied in Vietnam.

Zinc coating offers two protection functions: The first is a passive protection (passive protection) is the protective layer of metal such as traditional paints, and the second function is to protect the initiative (active protection) anti-corrosion function ie cathode (cathodic protection), this function in the protective coating by hot dip galvanized (hot-dip Galvanizing).

99% Zn Zinc on very good electrical conductivity, thus allowing current to flow continuously in all directions on the coating. This is a prerequisite for coating with cathode anti-corrosion function. When the coating has the appearance of wet electrolyte formation will occur chemical reaction and zinc have high voltage transmission electron than steel should engage immediately in response process, dispersion and freeing the electrons generated electric current through steel impede the distribution of steel and started ions electrochemical cycle. Zinc became a sacrifice to protect the steel cathode.

The reaction to produce hydrogen-potty-pieces of zinc and other zinc salts that form a thin film covering the surface layer of galvanized. This new layer waterproof membrane, water, and weather prevent attacks stop galvanic corrosion process. The film now serves as a passive protection layer.

When this protective layer is damaged, the zinc particles ready to participate in the process of new electrochemical corrosion resistance. Just like that zinc will sacrifice, even if a galvanized layer is scratched corrosion cannot perform its intended corrosion and attack the layers beneath the coating. This process helps to protect the metal from corrosion and self-healing in points scratches.

On this point, the traditional paint or other paint coated with zinc content (not the purity of zinc) below 92%, it can not be obtained. Therefore, being a very small hole, using only dots, well enough to aggressive agents broke into the iron roads, making rusted iron started quickly.

Zinc has been shown to be protective coating offers for betol Vietnam, steel structure works in the waters for decades. Spray the solution of zinc coated hot dip galvanized substitute effectively for large-sized structures and fixed as pipelines, tanks, port works, irrigation, roads and bridges maintenance repair used for hot-dip galvanized structures corroded over time at less cost but highly effective.

However, consuming plenty of galvanized costs for large projects. Up to hundreds of millions. On the other hand, the color of zinc is very monotonous and not to bring color to the whole project. Benzo Alkyd paint coating metal has optimum protection has brought the beauty of colors. Making homeowners will be satisfied.