Corrosion Engineering Chapter 1 questions with
answers
Destruction of a metal by a chemical or electrochemical reaction with its environment - **
VERIFIED ANSWERS **✔✔What is Corrosion
Natural State - ** VERIFIED ANSWERS **✔✔Metals usually exist in their?
Wet and Dry - ** VERIFIED ANSWERS **✔✔Two Types of Corrosion
Electrochemical effects , environmental effects , and metallurgical effects - ** VERIFIED
ANSWERS **✔✔Ability of a metal to resist corrosion depends on three factors
higher corrosion - ** VERIFIED ANSWERS **✔✔Many grains result in a
Simultaneously - ** VERIFIED ANSWERS **✔✔Anodic and Cathodic reactions occur
Hydrogen Evolution - ** VERIFIED ANSWERS **✔✔2H+ 2e -> H2
Oxygen Reduction(Acidic Solution) - ** VERIFIED ANSWERS **✔✔O2 + 4H+ + 4e ->
2H20
Oxygen Reduction(Neutral or Basic Solution) - ** VERIFIED ANSWERS **✔✔O2 + 2H2O
+ 4e -> 4OH-
Metal Ion Reduction - ** VERIFIED ANSWERS **✔✔M3+ + 1e -> M2+
, Metal deposition - ** VERIFIED ANSWERS **✔✔M+ + 1e -> M
Less - ** VERIFIED ANSWERS **✔✔Is pure water more or less corrosive than impure or
natural waters?
mpy = 54W/DAT where w= wt loss (mg)
D= density (g/cm^3)
A= area in^2 - ** VERIFIED ANSWERS **✔✔What is the equation for mils per year
increases - ** VERIFIED ANSWERS **✔✔As corrosion rate increases, oxidizing power
Increase it - ** VERIFIED ANSWERS **✔✔Increasing temperature will do what to the
corrosion rate?
10 Celcius - ** VERIFIED ANSWERS **✔✔How much temp rise does it take for a double in
reaction rate?
Different parts of the metal are at different temperatures - ** VERIFIED ANSWERS
**✔✔What are differential temperature cells?
Putting two metals in contact with one another - ** VERIFIED ANSWERS **✔✔What is
galvanic coupling?
Most reactive metal will be attacked while passivating the less reactive metal - ** VERIFIED
ANSWERS **✔✔How does galvanic coupling work?
A cell where the aerated electrode becomes the cathode and the deaerated electrode
becomes the anode. - ** VERIFIED ANSWERS **✔✔What is a differential aeration cell?
answers
Destruction of a metal by a chemical or electrochemical reaction with its environment - **
VERIFIED ANSWERS **✔✔What is Corrosion
Natural State - ** VERIFIED ANSWERS **✔✔Metals usually exist in their?
Wet and Dry - ** VERIFIED ANSWERS **✔✔Two Types of Corrosion
Electrochemical effects , environmental effects , and metallurgical effects - ** VERIFIED
ANSWERS **✔✔Ability of a metal to resist corrosion depends on three factors
higher corrosion - ** VERIFIED ANSWERS **✔✔Many grains result in a
Simultaneously - ** VERIFIED ANSWERS **✔✔Anodic and Cathodic reactions occur
Hydrogen Evolution - ** VERIFIED ANSWERS **✔✔2H+ 2e -> H2
Oxygen Reduction(Acidic Solution) - ** VERIFIED ANSWERS **✔✔O2 + 4H+ + 4e ->
2H20
Oxygen Reduction(Neutral or Basic Solution) - ** VERIFIED ANSWERS **✔✔O2 + 2H2O
+ 4e -> 4OH-
Metal Ion Reduction - ** VERIFIED ANSWERS **✔✔M3+ + 1e -> M2+
, Metal deposition - ** VERIFIED ANSWERS **✔✔M+ + 1e -> M
Less - ** VERIFIED ANSWERS **✔✔Is pure water more or less corrosive than impure or
natural waters?
mpy = 54W/DAT where w= wt loss (mg)
D= density (g/cm^3)
A= area in^2 - ** VERIFIED ANSWERS **✔✔What is the equation for mils per year
increases - ** VERIFIED ANSWERS **✔✔As corrosion rate increases, oxidizing power
Increase it - ** VERIFIED ANSWERS **✔✔Increasing temperature will do what to the
corrosion rate?
10 Celcius - ** VERIFIED ANSWERS **✔✔How much temp rise does it take for a double in
reaction rate?
Different parts of the metal are at different temperatures - ** VERIFIED ANSWERS
**✔✔What are differential temperature cells?
Putting two metals in contact with one another - ** VERIFIED ANSWERS **✔✔What is
galvanic coupling?
Most reactive metal will be attacked while passivating the less reactive metal - ** VERIFIED
ANSWERS **✔✔How does galvanic coupling work?
A cell where the aerated electrode becomes the cathode and the deaerated electrode
becomes the anode. - ** VERIFIED ANSWERS **✔✔What is a differential aeration cell?
