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 It has been over 10 years since zinc alloy plating was introduced as a surface treatment method with high corrosion resistance. Not only the excellent corrosion resistance but also the appropriate color and appearance are now required. As a process that meets the market need, we recommend the zinc-cobalt-iron ternary alloy plating. Using the ternary alloy of zinc-cobalt-iron as undercoat, the black chromate film with a high-level of corrosion resistance can be obtained.
Why is it zinc-cobalt-iron?
It is said that only 1% of cobalt co-deposited in the film has an equal effect to improve corrosion resistance to 10% of nickel. Strong resistance to sulfur dioxide, which has been recently energed as an issue, is another characteristic of zinc-cobalt-iron alloy plating. Although the zinc-cobalt alloy undercoat provides the black chromate film with the excellent corrosion resistance, adding iron further promotes its rust-proof property. It has been confirmed that, compared to binary alloy (zinc-iron or zinc-cobalt), the appearance and co-deposion rate are stable in a wider range of current density by the cobalt-iron interaction in electrodeposition. |
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| Zinc-cobalt-iron ternary alloy plating "EBALOY ZCF" |
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The black film with the excellent corrosion resistance can be obtained by the chromate treatment. |
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Zincate-base bath with good throwing power. |
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The alloy ratio is stable in the wide range of current density. |
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Common equipment and processes for zinc plating can be used. |
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Either treatment method of racks or barrels can be used. |
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Equal properties and torque coefficient to the common zinc plating. |
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No problem to use the common wastewater treatment because of no use of the strong chelating agent. |
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