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In this application the coating metal sacrifices itself to protect the underlying metal. The coating metal needs to have only a slightly higher reactivity than the metal it is protecting. Otherwise it will be used up prematurely. The "half-reaction potential" for metallic zinc is about -0.76 volts, that for magnesium about -2.37.

Current prices for zinc are around US$1800 per metric tonne and for magnesium around US3300. A higher price would only exacerbate the effect of faster loss.

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12y ago

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