Corrosion Engineering
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A list of questions related to corrosion engineering which are surely going to boggle your heads !
- 1.Rusting of iron is a typical example for
- A.
Chemical corrosion
- B.
Electrochemical corrosion
- C.
Physical reaction
- D.
None of these
- 2.Pitting factor of unity represents ____ corrosion.
- A.
Uniform
- B.
Galvanic
- C.
Inter granular
- D.
Fretting
- 3.Passivity in stainless steel is due to the formation of
- A.
Sulphide film
- B.
Carbide film
- C.
Oxide film
- D.
Chloride film
- 4.Iron pipe carrying water is more anodic to copper. This is due to
- A.
Concentration cell
- B.
Galvanic cell
- C.
Electrolytic cell
- D.
Leclanche cell
- 5.The tip and morphology of the crack due to SCC phenomenon will be
- A.
Sharp and transgranular
- B.
Blunt and intergranular
- C.
Blunt and transgranular
- D.
None of these
- 6.Which of the following metal can be used for cathodic protection of steel
- A.
Al
- B.
Cu
- C.
Ag
- D.
Au
- 7.In zinc – aluminium galvanic couple, when exposed to acidic solutions
- A.
Zinc dissolves
- B.
Aluminium dissolves
- C.
Both dissolve
- D.
None of these
- 8.The equation for uniform corrosion is given by :
- A.
Mpy = 534/(DAT)
- B.
Mpy = 584/(DAT)
- C.
Mpy = (DAT) / 534
- D.
Mpy = (DAT) / 584
- 9.Typical example for anodic metallic coating is
- A.
Zn on Steel
- B.
Cu on Steel
- C.
Au on steel
- D.
All of these
- 10.Pourbaix diagram is a graphical plot of
- A.
E Vs pH
- B.
E Vs Log i
- C.
E Vs time
- D.
Current Vs Potential
- 11.The terminology used for uniform corrosion of nickel and nickel base alloys is
- A.
Tarnishing
- B.
Fogging
- C.
Dulling
- D.
None of these
- 12.Knife line attack in IGC refers to
- A.
Low temperature HAZ
- B.
High temperature HAZ
- C.
Weld zone
- D.
Base metal
- 13.Pilling – Bedworth ratio is pertinent to
- A.
Internal oxidation
- B.
High temperature sulphidation
- C.
Catastrophic oxidation
- D.
High temperature oxidation
- 14.
- A.
Pitting
- B.
Gasket
- C.
Uniform
- D.
Fretting
- 15.The sensitization caused in stainless steel for IGC to occur is _____ to corrosive medium
- A.
The prerequisite before exposure
- B.
Post treatment after exposure
- C.
Mere thermal cycle without exposure
- D.
None of these
- 16.The main cause for the IGC attack in SS is the formation of ____ at the grain boundary.
- A.
Chromium carbide precipitate
- B.
Titanium carbide
- C.
Molybdenum carbide
- D.
Tungsten carbide
- 17.Experimental setup for stress corrosion cracking should involve ___ application of ultimate tensile stress.
- A.
100%
- B.
0%
- C.
Less than 100%
- D.
None of these
- 18.The formation of horse-shoe pit is one of the methods of recognizing the occurrence of ____ corrosion.
- A.
Pitting
- B.
Galvanic
- C.
Erosion
- D.
Intergranular
- 19.The phenomenon of corrosion that occurs on rail roads is _____
- A.
Crevice
- B.
Corrosion fatigue
- C.
High temperature oxidation
- D.
Fretting
- 20.Catastrophic oxidation is exhibited by metals obeying ____ rate law kinetics.
- A.
Logarithmic
- B.
Parabolic
- C.
Linear
- D.
Cubic
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