Jan-2026 Pass Your API-571 Exam at the First Try with 100% Real Exam [Q18-Q36]

NEW QUESTION 18
Ammonium chloride corrosion is the general or localized corrosion, often pitting, normally occurring under ammonium chloride or amine salt deposits. All commonly used materials are susceptible to ammonium chloride corrosion. A small amount of _________ can lead to very aggressive corrosion.

NEW QUESTION 19
Cadmium and lead will cause LME on _____________.

NEW QUESTION 20
Mechanical fatigue can cause cracks that initiate from the surface and often form a:

NEW QUESTION 21
Stainless steels have higher coefficients of thermal expansion than carbon steel or low alloy steel or nickel based alloys and are more likely to see _________.

NEW QUESTION 22
__________ caustic concentrations and ________ temperatures increase the likelihood and severity of cracking with caustic embrittlement.

NEW QUESTION 23
Carbonate stress corrosion cracking usually occurs at welds or cold worked areas that __________.

NEW QUESTION 24
______ is most likely found in hard welds and heat affected zones and in high strength components.

NEW QUESTION 25
At which of the following temperatures would the highest atmospheric corrosion rates be expected?

NEW QUESTION 26
___________ cracking has been a major problem in coke drum shells.

NEW QUESTION 27
Cracks connecting hydrogen blisters are referred to as ________.

NEW QUESTION 28
Alloy 400 is susceptible to LME when it comes in contact with molten ________.

NEW QUESTION 29
With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the water evaporates quickly.

NEW QUESTION 30
Characteristic stress corrosion cracks have many branches and may be visually detectable by a __________ appearance on the surface.

NEW QUESTION 31
Nitriding layers are magnetic. Therefore, _________ should be checked for magnetism as an initial screening for nitriding.

NEW QUESTION 32
__________ is usually found in aqueous environments or services where water is sometimes or always present, especially where stagnant or low-flow conditions allow the growth of microorganisms.

NEW QUESTION 33
Atmospheric corrosion:

NEW QUESTION 34
SSC is a form of ________ stress corrosion cracking.

NEW QUESTION 35
The severity of hydrochloric acid corrosion ________ with _________ HCl concentration and increasing temperatures.

NEW QUESTION 36
Corrosion under insulation mitigation is best achieved by: