Catalogue of Seven Diamonds (920 KB) 
The rusting process is accelerated cause of water, oxygen an the other corrosive elements in the atmosphere seep on the steel surface, and rust bubble grows very rapidly when it breaks many times reveals a complete rust through of the steel and it requires a replacement or repair of the dump body. The solution to this problem is the galvanizing coating which is metallurgical bonded to the steel at the molecule level through a series of zinc-iron alloy layers that has turned against the accelerating the rusting process and providing long term corrosion protection of steel.
The history of galvanizing goes back to 1742 when a French chemist named Melouin described in a presentation to the French Royal Academy, a method of coating iron by dipping it in molten zinc. In 1836 another French chemist, Sorel , obtained a patent for a means of coating iron with zinc after first cleaning it with sulfuric acid and fluxing it with ammonium chloride. For over 140 years galvanizing has had a proven history of commercial success as a method of corrosion protection in a myriad of application worldwide.
Hot dipped galvanizing is the process of applying a zinc coating to fabricated iron or steel material by immersing the material in a bath consisting primarily of molten zinc. The simplicity of the galvanizing process is a distinct advantage over other methods of providing corrosion protection. Corrosion resistance for the steel sheets provided by the zinc coating process and it proportional to the thickness of zinc coating layer selected taking into consideration the life expectancy of products and environment conditions and the quality of the surface desired .The durability of products can be improved by painting or coil coating .
Hot dip galvanizing method, provides protection against corrosive materials for steel far superior to that provided by any other method. Hot dipped galvanizing or barrier protection is perhaps the oldest and widest used method of corrosion protection. It acts by providing a barrier protection between the electrolytes in the environment and iron or steel .The two most important properties of barrier protection are adhesion the base metal and abrasion resistance.
The galvanized process is more than just a barrier coating ; it actually becomes part of the steel surface and is anodic to the steel substrate. Because zinc reacts with the atmosphere, the galvanized coating is constantly changing. Zinc reacts with the environment to form protective zinc oxides, zinc hydroxides and zinc carbonates. The zinc carbonates over time provide a stable base to apply paint for aesthetic reasons. Zinc coating offers dual protection :
Coating metallurgical bonds to steel providing barrier protection.
- Sacrifices itself to protect the underlying steel.
Furthermore, galvanizing for protection of iron and steel is favored because of its low cost, the ease of application, and the extended maintenance-free service that it provides. Several other zinc methods attempt to prevent rusting of mild steel, first sacrificial coating knowing as cathodic protection, and second zinc rich paint. Neither method can compete with the hot dipped galvanizing process.
