Hydrogen stress cracking is the same mechanism that is responsible for sulfide stress corrosion cracking in wet H²S environments except that HF acid is generating the __________.
A. Sulfide
B. Caustic
C. Hydrogen
D. Water
Cracking of dissimilar weld metals occurs on the _________ side of a weld between an austenitic and a Ferritic material operating at high temperatures.
A. Austenitic
B. Ferritic
C. Anodic
D. Cathodic
With very few exceptions, cooling water should always be on the ________ side to minimize stagnant areas.
A. Tube
B. Shell
C. Inlet
D. Outlet
Sulfidation of iron-based alloys usually begins at about:
A. 150º F.
B. 250º F.
C. 500º F.
D. 1100º F.
Erosion-corrosion is a description for the damage that occurs when corrosion contributes to erosion by removing protective films or scales, or by exposing the metal surface to further ________ under the combined action of corrosion-erosion.
A. Stress
B. Corrosion
C. Oxidation
D. None of the above
_____________ usually occurs when a colder liquid contacts a warmer metal surface.
A. Brittle fracture
B. Thermal fatigue
C. Thermal shock
D. Stress rupture
In HF service, carbon steel forms a protective fluoride scale in dry concentrated acid. Loss of the protective scale through high _________ or turbulence will result in greatly accelerated corrosion rates.
A. Temperature
B. Pressure
C. Velocities
D. None of the above
A loss in ductility of high strength steels due to the penetration of atomic hydrogen can lead to brittle cracking called hydrogen embrittlement. Which of the following materials is susceptible to HE.
A. Carbon steel
B. 400 Series SS
C. Low alloy steel
D. All of the above
With ammonia stress corrosion cracking weld hardness should not exceed _______ BHN.
A. 237
B. 225
C. 235
D. 218
High strength steels are susceptible to LME when they come in contact with molten ________.
A. Cadmium
B. Zinc
C. Lead
D. Both A and C
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