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Chromium plated sheet coil is a kind of steel plate with a layer of chromium on its surface. In order to prevent the steel plate from being corroded and prolong its service life, a layer of metal chromium is coated on the surface of the steel plate. Chromium is a commonly used and effective anti-corrosion method.
Chromium plating method:
The insoluble anode made of lead and lead-antimony alloys only plays the role of transmitting electrons and conducting current. The chromium ion concentration in the electrolyte depends on the addition of chromium compounds to the plating bath regularly.
The chromium plating coil is made of low carbon structural thin steel plate, but the chromium plating layer is very thin (< 1.3 um), and the process is the same as that of tinplate.
Characteristics of chrome plated sheet:
The structure of chromium plated coil has four layers: steel substrate, metal chromium layer, hydrated chromium oxide layer and oil film. Because the substrates are the same, the mechanical properties are the same as tinplate, but they have their own characteristics in application.
1. The cost is about 10% lower than that of tinplate, and the appearance gloss is not as good as that of tinplate.
2。 The corrosion resistance is inferior to tinplate, the coating is thin and the pinhole rate is high, so the inner and outer surfaces should be coated when used。
3. The adhesion of chrome-plated sheet to organic coatings is 3-6 times stronger than that of tin-plated sheet. Sulfur corrosion resistance is also stronger than tinplate.
4。 Chromium plated sheets can not be soldered by tin, but can only be welded by overlapping resistance welding or bonding。
秒速时时彩投注5. The coating is thin and tough, and can be easily broken, so it is not suitable to wash the tank. It can be used in deep-drawing tank.
6。 Chromium-plated sheets have high temperature resistance。 Generally, the color and hardness of chromium-plated sheets do not change significantly at 5000 C, but begin to soften at 7000 C。