Which metal, if coated onto iron, would prevent the corrosion of iron?
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Mg will protect iron by a galvanic effect, just as zinc protects galvanized steel. It does this because it is more reactive than iron. However, the Mg will eventually all be oxidized, than the iron will start to rust. So just as with galvanizing, the coating will delay the rusting, possibly for decades, but it will not permanently prevent it.
For Cr and Cu, much depends on how thick and how complete the coating is, and what the source of the corrosion is.
Cr is used to protect steel, because it is less reactive than iron, and forms a barrier. However, if the Cr plating has holes in it rust happens there [and since iron swells when it rusts, the Cr film will peel off]. The layer of Cr is acting just like a...
Textbook: Introductory Chemistry
Author: Nivaldo J Tro
The full step-by-step solution to problem: 94P from chapter: 16 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. The answer to “Which metal, if coated onto iron, would prevent the corrosion of iron?(a) Mg(b) Cr(c) Cu” is broken down into a number of easy to follow steps, and 15 words. This full solution covers the following key subjects: iron, metal, coated, corrosion, onto. This expansive textbook survival guide covers 19 chapters, and 2045 solutions. Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. Since the solution to 94P from 16 chapter was answered, more than 311 students have viewed the full step-by-step answer.