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Which of the following metals would make the best sacrificial anode for an iron structure? O Au Cr O Mg O Ni Cu

Which of the following metals would make the best sacrificial anode for an iron structure? O Au Cr O Mg O Ni Cu

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Question:** Which of the following metals would make the best sacrificial anode for an iron structure? **Options:** - ○ Au - ○ Cr - ○ Mg - ○ Ni - ○ Cu **Explanation:** In the context of cathodic protection for preventing corrosion of iron structures, the best sacrificial anode is a metal that is more reactive (more anodic) than iron. This means it will corrode in place of the iron. - **Au (Gold):** Not suitable as it is noble and less reactive. - **Cr (Chromium):** Less suitable, not commonly used for this purpose. - **Mg (Magnesium):** Highly suitable due to its high reactivity and common use as a sacrificial anode. - **Ni (Nickel):** Less suitable as it is more noble than iron. - **Cu (Copper):** Not suitable because it is less reactive and can cause galvanic corrosion of iron. Therefore, **Mg (Magnesium)** is the ideal choice for a sacrificial anode for iron structures.
Transcribed Image Text:**Question:** Which of the following metals would make the best sacrificial anode for an iron structure? **Options:** - ○ Au - ○ Cr - ○ Mg - ○ Ni - ○ Cu **Explanation:** In the context of cathodic protection for preventing corrosion of iron structures, the best sacrificial anode is a metal that is more reactive (more anodic) than iron. This means it will corrode in place of the iron. - **Au (Gold):** Not suitable as it is noble and less reactive. - **Cr (Chromium):** Less suitable, not commonly used for this purpose. - **Mg (Magnesium):** Highly suitable due to its high reactivity and common use as a sacrificial anode. - **Ni (Nickel):** Less suitable as it is more noble than iron. - **Cu (Copper):** Not suitable because it is less reactive and can cause galvanic corrosion of iron. Therefore, **Mg (Magnesium)** is the ideal choice for a sacrificial anode for iron structures.
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