Corrosion Technician Exam Questions
And Answers Already Graded A+
What are the 9 forms of of corrosion? CORRECT ANSWERS 1: General
2 Localized
3. Galvanic
4. Environmental
5. Flow-assisted
6. Entergranular
7. Dealloying
8. Fretting
9. High-temperature oxidation
List the 3 types of localized corrosion CORRECT ANSWERS 1. Pitting
2. Crevice
3. Filiform
List the four types of environmental cracking CORRECT ANSWERS 1. Stress corrosion
cracking
2. Hydrogen-induced cracking and sulfide stress cracking
3. Liquid metal embrittlement
4. Corrosion fatigue
List the 3 types of flow-assisted corrosion CORRECT ANSWERS 1. Erosion-corrosion
2. Impingement
3. Cavitation
What combination will result in more than one form of corrosion within a system?
CORRECT ANSWERS Metals used in structures/equipment and a wide range of
environments
Even a single alloy exposed to different environments at different points within a system
can undergo _______ CORRECT ANSWERS More than one type of attack
________ is attack that proceeds more or less uniformly over the exposed surface with
appreciable localization of attack CORRECT ANSWERS General corrosion
Two other names for general corrosion are _______________ CORRECT ANSWERS
General attack corrosion and uniform corrosion
For round bars or wires, corrosion proceeds radially inward at essentially a uniform rate
around the entire circumference. The result is ______________________ CORRECT
ANSWERS A bar or wire of progressively smaller diameter
, Pipe and tubing that suffer from general corrosion are CORRECT ANSWERS Thinned
from one side, or the other, or both
General attack corrosion can be recognized by CORRECT ANSWERS A roughening of
the surface and by the presence of corrosion products
Why may corrosion products not always be present with general corrosion? CORRECT
ANSWERS They can be soluble or can be removed by wind, rain, and other forces
An electrochemical process taking place on the surface of the material CORRECT
ANSWERS general attack corrosion
With general corrosion, the anodes and cathodes are caused by... CORRECT
ANSWERS Minor differences in composition or orientation between small areas on the
metal surface
List three kinds of general corrosion rates CORRECT ANSWERS 1. linear
2. decreasing with time
3. increasing with time
When corrosion rates are __________ or ___________, long-term projections of
corrosion damage are possible. CORRECT ANSWERS Linear, decrease with time
When corrosion rates ______________, it is more difficult to predict long-term
corrosion. CORRECT ANSWERS Increasing with time
General attack corrosion is usually measured in terms of CORRECT ANSWERS
Penetration rates per unit of time in millimeters per year or mils per year
Experimental measurement of general attack corrosion is usually made by measuring
________________ and calculating ________________. CORRECT ANSWERS
Weight loss, the equivalent loss of metal thickness
_________ and _____________ steels perform well in a wide variety of environments,
including, atmospheric pressure, immersion in natural waters and many chemicals, and
underground. CORRECT ANSWERS carbon, low-alloy steels
True or false? Aluminum and aluminum alloys may be used where localized corrosion
does NOT occur. CORRECT ANSWERS True
Rates of uniform corrosion of aluminum can be very high in ______________
environments. CORRECT ANSWERS alkiline
True or false? Protective coatings are particularly effective in controlling uniform
corrosion. CORRECT ANSWERS True
And Answers Already Graded A+
What are the 9 forms of of corrosion? CORRECT ANSWERS 1: General
2 Localized
3. Galvanic
4. Environmental
5. Flow-assisted
6. Entergranular
7. Dealloying
8. Fretting
9. High-temperature oxidation
List the 3 types of localized corrosion CORRECT ANSWERS 1. Pitting
2. Crevice
3. Filiform
List the four types of environmental cracking CORRECT ANSWERS 1. Stress corrosion
cracking
2. Hydrogen-induced cracking and sulfide stress cracking
3. Liquid metal embrittlement
4. Corrosion fatigue
List the 3 types of flow-assisted corrosion CORRECT ANSWERS 1. Erosion-corrosion
2. Impingement
3. Cavitation
What combination will result in more than one form of corrosion within a system?
CORRECT ANSWERS Metals used in structures/equipment and a wide range of
environments
Even a single alloy exposed to different environments at different points within a system
can undergo _______ CORRECT ANSWERS More than one type of attack
________ is attack that proceeds more or less uniformly over the exposed surface with
appreciable localization of attack CORRECT ANSWERS General corrosion
Two other names for general corrosion are _______________ CORRECT ANSWERS
General attack corrosion and uniform corrosion
For round bars or wires, corrosion proceeds radially inward at essentially a uniform rate
around the entire circumference. The result is ______________________ CORRECT
ANSWERS A bar or wire of progressively smaller diameter
, Pipe and tubing that suffer from general corrosion are CORRECT ANSWERS Thinned
from one side, or the other, or both
General attack corrosion can be recognized by CORRECT ANSWERS A roughening of
the surface and by the presence of corrosion products
Why may corrosion products not always be present with general corrosion? CORRECT
ANSWERS They can be soluble or can be removed by wind, rain, and other forces
An electrochemical process taking place on the surface of the material CORRECT
ANSWERS general attack corrosion
With general corrosion, the anodes and cathodes are caused by... CORRECT
ANSWERS Minor differences in composition or orientation between small areas on the
metal surface
List three kinds of general corrosion rates CORRECT ANSWERS 1. linear
2. decreasing with time
3. increasing with time
When corrosion rates are __________ or ___________, long-term projections of
corrosion damage are possible. CORRECT ANSWERS Linear, decrease with time
When corrosion rates ______________, it is more difficult to predict long-term
corrosion. CORRECT ANSWERS Increasing with time
General attack corrosion is usually measured in terms of CORRECT ANSWERS
Penetration rates per unit of time in millimeters per year or mils per year
Experimental measurement of general attack corrosion is usually made by measuring
________________ and calculating ________________. CORRECT ANSWERS
Weight loss, the equivalent loss of metal thickness
_________ and _____________ steels perform well in a wide variety of environments,
including, atmospheric pressure, immersion in natural waters and many chemicals, and
underground. CORRECT ANSWERS carbon, low-alloy steels
True or false? Aluminum and aluminum alloys may be used where localized corrosion
does NOT occur. CORRECT ANSWERS True
Rates of uniform corrosion of aluminum can be very high in ______________
environments. CORRECT ANSWERS alkiline
True or false? Protective coatings are particularly effective in controlling uniform
corrosion. CORRECT ANSWERS True
