Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode________________?
Correct answer: D. All A, B. & C.
- A. Occurs higher in the electro-chemical series of metals
- B. Is exemplified by magnesium plate
- C. Is much cheaper than the cathodic base material to be guarded against corrosion
- D. All A, B. & C.
Explanation
A sacrificial anode must be more readily oxidized than the protected pipeline, such as magnesium, and is usually inexpensive relative to the structure. Thus statements A, B, and C describe the method as intended.
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