Question 1

Which of the following alkanolamine systems is the least aggressive in causing amine corrosion?

Accepted Answer

A)  Monoethanolamine (ME
A)  
B)  Diglycolamine (DG
A)  
C)  Diethanolamine (DE
A)  
D)  Methyldiethanolamine (MDE
A)

Question 2

__________ is a change in the microstructure of certain carbon steels and 0.5 Mo steels after long term operation in the 800º F to 1100º F range.

Accepted Answer

A)  Graphitization 
B)  Softening 
C)  Temper Embrittlement 
D)  Creep

Question 3

The loss in strength from spheroidization (Softening) is usually accompanied by a(n) _________ in ductility, which allows for deformation at stress concentrations.

Accepted Answer

A)  Increase 
B)  Decrease 
C)  Reduction 
D)  Yield

Question 4

Sulfide stress cracking (SSC) is defined as cracking of metal under the combined action of tensile stress and corrosion in the presence of _________ and _________.

Accepted Answer

A)  Sulfur, Oxide 
B)  Hydrogen, water 
C)  H₂S, Oxygen 
D)  Water, H₂S

Question 5

Cracks that are typically straight, non-branching, and devoid of any associated plastic deformation are likely associated with which type of failure?

Accepted Answer

A)  Stress corrosion cracking 
B)  Brittle fracture 
C)  Thermal fatigue 
D)  Temper embrittlement

Question 6

Amine stress corrosion cracking is a term applied to the cracking of steels under the combined actions of ________ and __________ in aqueous alkanolamine systems used to remove/absorb H₂S and/or CO₂ and their mixtures from various gas and liquid hydrocarbon streams.

Accepted Answer

A)  Temperature, pressure 
B)  Pressure, stress 
C)  Temperature, corrosion 
D)  Tensile stress, corrosion

Question 7

The signature mark of a fatigue failure is a _______ type fingerprint that has concentric rings.

Accepted Answer

A)  Eyebrow 
B)  Half-Moon 
C)  Radii 
D)  Clam Shell

Question 8

A form of corrosion caused by living organisms such as bacteria, algae or fungi is _______ .

Accepted Answer

A)  HIC 
B)  SOHIC 
C)  MIC 
D)  None of the above

Question 9

In order for PASCC to occur the material must be ______.

Accepted Answer

A)  PWHT 
B)  Non-PWHT 
C)  Sensitized 
D)  Austenitic

Question 10

_________ is a change in the microstructure of certain carbon steels and 0.5Mo steels after long-term operation in the 800º F to 1100º F range that may cause a loss in strength, ductility and/or creep resistance.

Accepted Answer

A)  Embrittlement 
B)  Carburization 
C)  Graphitization 
D)  Sensitization

Question 11

Which of the following materials is not susceptible to SCC?

Accepted Answer

A)  Carbon steel 
B)  300 Series SS 
C)  Low alloy steel 
D)  Both A and C

Question 12

The dewpoint of hydrochloric acid depends on the concentration of hydrogen chloride. It is typically about _________.

Accepted Answer

A)  180º F 
B)  160º F 
C)  130º F 
D)  110º F

Question 13

________ is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles.

Accepted Answer

A)  Condensate corrosion 
B)  Cavitation 
C)  Dew-Point corrosion 
D)  Atmospheric corrosion

Question 14

_________ corrosion rates are found in a gas oil desulfurizers and hydrocrackers than naphtha desulfurizers and hydrocrackers by a factor of almost "2".

Accepted Answer

A)  Lower 
B)  Higher 
C)  Sulfidation 
D)  Hydrogen corrosion

Question 15

Soil corrosion of carbon steel can be minimized through the use of special backfill, coatings and _______.

Accepted Answer

A)  Cathodic protection 
B)  Resistivity 
C)  Temperature 
D)  None of the above

Question 16

What is the chemical symbol for butane of butylenes?

Accepted Answer

A)  C₂ 
B)  C3 
C)  C4 
D)  CH4

Question 17

Components that have been carburized may have a change in the level of ________.

Accepted Answer

A)  Carbon 
B)  Chromium 
C)  Ferromagnetism 
D)  Stress

Question 18

High temperature H₂ / H₂S corrosion damage is minimized by using alloys with high _________ content.

Accepted Answer

A)  Carbon 
B)  Molybdenum 
C)  Chromium 
D)  Stainless

Question 19

Cracks connecting hydrogen blisters are referred to as ________.

Accepted Answer

A)  SOHIC 
B)  HIC 
C)  SCC 
D)  None of the above

Question 20

Steel cleanliness and _______ have a significant influence on toughness and resistance to brittle fracture.

Accepted Answer

A)  Composition 
B)  Alloy 
C)  Grain size 
D)  None of the above

Exam 1: Corrosion and Materials