Physical barrier: Isolates the steel substrate from the corrosive medium (water vapor, oxygen).
Electrochemical protection: Zinc has a more negative potential than iron, and acts as a sacrificial anode to corrode preferentially, protecting the steel substrate.
Self-healing: Zinc corrosion products (such as basic zinc carbonate) can fill tiny scratches and provide additional protection.
The core of DX51D steel coil production lies in the hot-dip galvanizing process:
1. Pre-treatment: The substrate of high-quality cold-rolled or hot-rolled steel coil is strictly cleaned (degreasing, pickling, rinsing, and plating) to ensure that the surface is absolutely clean and activated.
2. Hot-dip galvanizing: The steel strip is immersed in molten zinc liquid (about 450℃), and the iron-zinc reaction occurs to form a strong metallurgical bonding layer.
3. Zinc spangle control: By controlling the composition of zinc liquid (such as adding aluminum and antimony) and cooling method, different appearances (such as ordinary zinc spangles, small zinc spangles, and no zinc spangle smooth surface) can be obtained.
4. Post-treatment: It may include chromium passivation, oiling, smooth rolling, etc. to further improve corrosion resistance, processability or surface quality.
Why choose DX51D galvanized steel coil?
- The zinc layer provides strong protection, significantly extending theservice life of steel in harshenvironments (humid, industrialatmosphere, mild chemicalenvironment), effectively reducingmaintenance costs and replacementfrequency.
- From dry indoor environments to rainyoutdoor places, Gl coil Dx5ld canprovide reliable protection, and is an economical and efficient solution tothe challenges of natural rust.
- Good substrate material and zinc layer adhesion ensure that thecoating is not easy to peel off and thesubstrate is not easy to crack during complex deformation, which improvesthe processing yield and production efficiency.
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Q195 Q235 Q345 |
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SGCC SGCH SGC340 SGC400 SGC440 SGC490 SGC570 |
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SGHC SGH340 SGH400 SGH440 SGH490 SGH540 |
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DX51D DX52D DX53D DX54D DX55D DX56D DX57D |
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S220GD S250GD S280GD S320GD S350GD S400GD S500GD S550GD |
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SS230 SS250 SS275 |
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600mm to 1500mm |
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0.125mm to 3.5mm |
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30g/m2 to 275g/m2 |
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3 tons to 6 tons |
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508mm or 610mm |
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Unoil,Dry,Chromate Passivated, Non-chromate Passivated |
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1,500,000MT/year |
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15-25 Days |
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30-275g/m2 |
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3-8 Tons |
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