Corrosion resistance of the magnesium-aluminum-zinc color-coated sheet manufactured by SINOWELL METAL is five to twenty times of that of Al-Zn alloy coated steel sheet. Owning to its high activity, magnesium element provides “self-healing” function of steel section, is able to protect cut section of steel sheets effectively, solve the problem that the color-coated steel sheets purchased by customers in coastal areas are apt to rust and the problem that service life of the color-coated sheets used in steel structure works, electrical power works, purification works, photo voltaic works and refrigeration works is short. It brings the vast number of users with new selections and relies and provides more business opportunities to elites in the industry.
Introduction of magnesium-aluminum-zinc color-coated sheet product
The magnesium-aluminum-zinc color-coated sheet is to add Al, Mg and Si in previous Zn-coated sheets. Compounding effect of these additives improves corrosion resistance. Namely, the Mg with obvious effect and Si are added except the Al previously used, in order to improve anti-rust effect. Si improves machining ability of Al coating layer whiling enhancing corrosion resistance effect by compounding with Mg.
Excellent anti-rust performance! Not to mention its excellent anti-rust performance at straight sections, its anti-rust and alkali-resisting performance at end faces is also very excellent.
Outstanding machining ability! Except the bend-forming and stretching section will not get rusty easily, surface of the machined surface also has very less scratches and is very nice-looking. Its welding and paint properties are very good also. It has the coating adherence that can withstand strict machining, has higher coating hardness and outstanding resistance to damage, too.
It is widely used in construction, road protection, multi-layers parking garage,storage facility, automotive electro-mechanical equipment and other metal forming fields and can be used to produce various steel accessories,corrosion-resistance components, keel ceilings, perforated panels and cable bridges, etc. The components which are originally manufactured with hot-dipping galvanized steel sheet or hot-dipping galvanized-55% aluminum alloy steel sheet will have better and higher corrosion resistance if they are manufactured by magnesium-aluminum-zinc sheet. The later galvanizing or later coating operation can be omitted if the components which are previously subjected to later galvanizing or later coating operation are manufactured by magnesium-aluminum-zinc sheet, in order to reduce coat and shorten time of delivery.
The salt spray test results show that 700 hours are required when SST corrosion area of 70g magnesium-aluminum-zinc sheet reaches to 5% and only 100 hours are required for 100g Al-Zn alloy coated sheet which is available on market.
From the view of coating reduction speed, the magnesium-aluminum-zinc coated sheet has excellent corrosion resistance which is equally to 15 times of hot-dipping galvanized steel sheet and 5-8 times of hot-dipping galvanized-55% Al-Zn alloy coated steel sheet. When the substrate at end section of magnesium-aluminum-zinc coated sheet is exposed, slight red rust will be produced initially and then the coating ingredients around cutting face will start to dissolve subsequently, in order to form a layer of compact protective film which is primarily composed of zinc hydroxide, alkaline zinc chloride and magnesium hydrate, etc. This process will last for several months and then the cutting face will be covered completely, in order to prevent corrosion reaction of end face. The resistance of magnesium-aluminum-zinc coated sheet to red rust at straight sections is superior to that of stainless steel. Besides, it also has outstanding corrosion resistance at bend-forming sections and cylindricalstretching sections, too.
Copyright Reserved with SInowell Metal
Leave a Reply