Hot dip galvanizing is one sector is indispensable for the existence of durable products. Hot dip galvanized more un robust in the industrial backbone of Vietnam, a number of areas and products using advanced hot-dip galvanized:
In mechanical engineering: mechanical products are hot dip galvanized prior to market
In the field of media and television
In the construction sector and manufacturing
To meet the demand of the market, Phuong Tuan processor hot-dip galvanized steel structure industrial with new galvanized technologies, quality assurance customers the best products, at the age of the highest life expectancy.
1 / Alkaline zinc plating not Cyanuy:
Technologies galvanized not Cyanuy, not toxic and environmentally friendly.
This is galvanized latest technology in the world, has been widely used in the EU, the United States, Japan, Taiwan.
Alkaline zinc plating additives cyanuy capable of stable operation with the wide variation, the zinc layer uniformly distributed in the low current density areas as well as in areas with high current density. Shiny coating, easy passive. Ease of wastewater treatment
2 / Galvanized Acid:
Acid zinc plating technology simple savings.
Acid zinc plating additives work excellent metal distribution, thickness galvanized uniform distribution, which is more complex shape. Plating flat, shiny, good adhesion to the base metal, easy passive. Additives saving, easy to use, wide range of activities. Additives also enhance operation to completely remove surface grease on the metal surface adhesion
Suitable for recording, Plated treo.Ung: plated decorative, protective plated before painting ...
3 / Cold galvanizing method: Optimized for electrical works:
Nearly half the world's zinc output is used to protect steel against an "enemy" the most evil - the rust and corrosion has swallowed up tens of millions of tons of steel per year.
The country was forced to huge costs for the corrosion of metal works. in industrialized countries, average costs account for about 4% of the country's annual GDP
Under the impact of the environment, metal erosion, corrosion in the air, in the soil or in the wetlands for the life of the building was rapidly degraded. Uneven layer of rust, is the most dangerous forms of corrosion, rust holes reduces the load capacity of the structure. There is also the perception that: The reinforced concrete structures from corrosion. But in fact, reinforced concrete structures are often severely damaged by reinforcement corrosion, causing swelling, increase in volume, take the link between reinforcing steel and concrete, which reduces the load capacity and life works.
In our country, the cost of protection against corrosion is very low. Because most of the use regular primer should not works after a few years use to upgrade and maintenance.
Measures against the traditional rust and corrosion
Measures against rust and corrosion current popularity is the use of less corrosive materials. These materials usually have high cost, only installed in places not flooded and most commonly used measures of protection coating. Protective coating to form a barrier layer (barrier) metal isolated environment. But when this protective layer is broken, moisture penetration and corrosion attack on underneath the paint. Therefore, the paint is only effective for a few years.
For works submerged or buried in the soil, incorporate more measures cathode corrosion protection (cathodic protection). This measure has been widely used around the world for drilling rigs, piers, tanks and piping systems ...
Cathode corrosion is to use the nature of the electrochemical corrosion process to build a system include: cathode (metal protection) and anode. Anode was chosen as Mg, Al, Zn sacrifice alternative materials for iron and steel to be protected because these metals are standing in front of Fe in the periodic table. In the system there is always direct current passing between the anode and cathode, derived from the voltage difference between the two different metals in the environment exists electrolytic solution is water or power imposed from a external dimension.
Cold galvanizing method:
For over a century, zinc has been shown to be protective against rust and corrosion is very effective for metal. Today, the zinc is used in all parts of the world used to protect metals such as electrolytic plating, hot dip galvanized or zinc spraying
Cold galvanized metal surface is covered with a layer of liquid zinc paint similar in normal ambient temperature, pressure using compressed air to blow liquid zinc liquid beam of particles fired at metal surfaces clean surface. In a solution of zinc binding substance associated with the additive Zinc helps to hold on to the metal surface and dry in a few hours, similar to traditional paints.
Zinc coating after dry protection has two functions: First, passive protection (passive protection) with metal protective barrier as traditional paints; second function is active protection (active protection) that function cathode corrosion protection (cathodic protection), this function is available in the protective coating by hot-dip galvanized (hot-dip galvanizing).
Solution of zinc over 92% Zn is a very good mixture of conductive after dry, thus allowing current to flow continuously in all directions on the coating. This is a prerequisite for anti-corrosion coating cathode. When the coating has the appearance of wet forming electrolyte solution, the chemical reaction will occur, zinc electron transfer voltage higher than steel should take part in the reaction, and dispersion liberated electrons create an electrical current running through the steel impede diffusion of ions and steel started electrochemical cycle. Zinc become an object of sacrifice to protect steel cathode.
Reaction process to produce hydrogen carbonate zinc and other zinc salt to form a thin layer covering the surface of the galvanized layer. This new waterproof membrane to prevent water and weather attack to stop the process of electrochemical corrosion. At this time, the membrane acts as a protective layer passive.
When this protective layer is damaged, the zinc molecules are willing to participate in the new process of electrochemical corrosion. Just like that, the zinc will "sacrifice", even if the zinc coating from scratches, corrosion will not be possible "intentional" to create your rust coating and attack below. This process helps to protect the metal from corrosion and self-heal "wounds" at the scratches.
The traditional paint or zinc coatings with zinc (not zinc purity) of less than 92% can not get these advantages. Therefore, when a very small hole, though only by a period sufficient to aggressive agents can "break" the iron, makes iron rust quickly.
Currently on the market have painted galvanized cold of ZRC Worldwide Inc.. American. This is the world's leading manufacturer with over 50 years of experience producing cold galvanizing paint with 95% zinc in the coating after drying. Recognized practices of manufacturers shows: The works using ZRC cold galvanizing paint are long-term life expectancy of over 20 years. ZRC pass all the tests of hot-dip galvanized by standards such as ASTM, UL,, SSPC and is considered equivalent hot-dip galvanized. Figure illustrate with 5% salt fog testing (salt spray) in 2873 between the hot dip galvanized (left) and ZRC cold galvanizing (right) shows the ZRC shown remarkable features after trial.
Galvanized proved superior protection features should work for almost all of the electricity industry works today are using hot dipped galvanized steel. This coating over time wear down, how fast or slow depending on the quality of the coating and corrosion environment. Meanwhile, the maintenance of cold galvanized coating is truly an optimal solution in terms of technical and economic as new galvanized layer associated with molecules existing galvanized layer, maintaining the anti- cathode corrosion. In addition, this method allows easy construction at the site with spraying, scan or other traditional paint roller.