API 571: 4.2.14 Erosion/Erosion --
Corrosion Exam Questions and
Answers (Latest Update 2026)
What is erosion? -
correct answer ✅Erosion occurs when solids, liquids and vapours
impact a surface thus mechanically removing surface material.
What is corrosion/erosion? -
correct answer ✅This is where corrosion aids the erosion process
by removing protective films or scales or by exposing the metal
surface to corrosion with the combined action of erosion and
corrosion.
What is mostly affected by erosion, erosion/corrosion? -
correct answer ✅All metals, alloys and refractories (heat resistant
materials)
What does metal loss rates depend on? -
correct answer ✅Velocity and concentration of impacting medium
(particles, liquids, droplets, slurries and two phase flow)
Size and hardness of impacting particles
Hardness and Corrosion resistance of material
Angle of impact.
, API 571: 4.2.14 Erosion/Erosion --
Corrosion Exam Questions and
Answers (Latest Update 2026)
What metal is subject to higher rates of material loss? -
correct answer ✅Softer alloys like copper + aluminium alloys that
are easily worn by mechanical damage can suffer severe material
loss under high velocity conditions.
Does increasing material hardness prevent erosion? -
correct answer ✅Although its common to increase material
hardness to prevent erosion, often it is not always a good indicator
of erosion resistance, design features are particularity important.
What affects metal loss rates? -
correct answer ✅Size, shape, density and hardness of the
impacting medium affect the metal loss rate.
What is the relationship between corrosivity of the environment
and erosion? -
correct answer ✅Increasing the corosivity of the environment may
reduce the stability of protective surface films and increase the
susceptibility of metal loss. Metal may be removed from the surface
as dissolved ions or as solid corrosion product which is
mechanically swept away from the surface.
Corrosion Exam Questions and
Answers (Latest Update 2026)
What is erosion? -
correct answer ✅Erosion occurs when solids, liquids and vapours
impact a surface thus mechanically removing surface material.
What is corrosion/erosion? -
correct answer ✅This is where corrosion aids the erosion process
by removing protective films or scales or by exposing the metal
surface to corrosion with the combined action of erosion and
corrosion.
What is mostly affected by erosion, erosion/corrosion? -
correct answer ✅All metals, alloys and refractories (heat resistant
materials)
What does metal loss rates depend on? -
correct answer ✅Velocity and concentration of impacting medium
(particles, liquids, droplets, slurries and two phase flow)
Size and hardness of impacting particles
Hardness and Corrosion resistance of material
Angle of impact.
, API 571: 4.2.14 Erosion/Erosion --
Corrosion Exam Questions and
Answers (Latest Update 2026)
What metal is subject to higher rates of material loss? -
correct answer ✅Softer alloys like copper + aluminium alloys that
are easily worn by mechanical damage can suffer severe material
loss under high velocity conditions.
Does increasing material hardness prevent erosion? -
correct answer ✅Although its common to increase material
hardness to prevent erosion, often it is not always a good indicator
of erosion resistance, design features are particularity important.
What affects metal loss rates? -
correct answer ✅Size, shape, density and hardness of the
impacting medium affect the metal loss rate.
What is the relationship between corrosivity of the environment
and erosion? -
correct answer ✅Increasing the corosivity of the environment may
reduce the stability of protective surface films and increase the
susceptibility of metal loss. Metal may be removed from the surface
as dissolved ions or as solid corrosion product which is
mechanically swept away from the surface.
