INTERVIEW QUESTIONS
CORROSION
1. What is Galvanic series?
Answer: To describe the tendency to corrode in a given environment common metals and alloys are arranged on a qualitative scale called the galvanic series.
Eg:
18-8 stainless steel is passive in a a water and it is on the top on the top of
the table of the galvanic series in sea water environment.
2. What is a sacrificial anode?
Answer: Sacrificial
anode is related to corrosion protection. Protection by galvanic action is
provided by connecting the structure to be protected to a sacrificial anode.
The sacrificial anode to be replaced periodically.
3. What
is passivation?
Answer: Passivation
refers to the formation of a thin, high resistance oxide layer which reduces
the corrosion current by two or three orders of magnitude.
4. What are the common methods that are adopted in piping to avoid corrosion?
Answer: Wrapping
and Coating, Painting and Cathodic Protection.
5. For the grid blasting (For the surface preparation for painting)of stainless steel material which grid material is most preferred?
Answer: Aluminum
Oxide
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