FINAL Flashcards
0
Q
Relative humidity is measured with a wet candle apparatus. T or F
A
False
1
Q
Logarithmic corrosion curve is the most desirable. T or F
A
False
2
Q
Mixed metal oxide, High silicon cast-iron and scrap steel or examples of impressed current cathodic protection system and notes. T or F
A
True
3
Q
Which of the following is the most common preventative measure for Internal Corrosion? A. Protective coatings B. Cathodic protection C. Chemical inhibitors D. Material selection T. Structural design
A
Chemical inhibitors
4
Q
What surface preparation is white metal blast?
A
NACE 1
5
Q
Carburization occurs when carbon atoms are absorbed into the surface of the metal which develops a softer surface. T or F
A
False
6
Q
Which surface preparation is called industrial blast
A
NACE 8
7
Q
Which property is a physical property? A tensile strength. B. Hardness. C. Fatigue strength. D. Density.
A
D density
8
Q
Galvanic anode back fill serves which of the following purposes? A lower the circuit resistance. B. Promote uniform consumption of the anode. Letter see. Retain moisture. D. All of the above
A
D. All of the above
9
Q
Atmospheric corrosion is most often controlled by design or material selection. T or F
A
False
10
Q
Polarization of the cathode usually causes corrosion rates to?
A
B decrease
11
Q
Which surface preparation is called brush off blast?
A
NACE 4
12
Q
This material strong and light; easily welded but a bit more expensive than carbon steel it has outstanding low temperature properties when it is anodized. A. Aluminum. B. Sink. C. Magnesium. D. Carbon steel.
A
A. Aluminum
13
Q
Scale formation is not affected by pH
A
False
14
Q
As pollutants and contaminants decrease, corrosion rates normally?
A
Decrease
15
Q
Airborne salinity is measured with a psychrometer. T or F
A
False
16
Q
Potable water is water that has the mineral content removed. T or F
A
False
17
Q
Seawater contains
A
D. Contains about 3.5% sodium chloride
18
Q
COD is a test used to in directly measure the amount of organic compounds in water. T or F
A
True
19
Q
Which of the following potentials is the most cathodic? A. +1.1 V. B. +0.2 V. C. -0.8 V. D. -0.9 V.
A
A. +1.1 volts
20
Q
I CCP systems often use rectifiers as the DC power source. T or F
A
True
21
Q
At high temperatures, reducing environments are less corrosive than oxidizing environments? T or F
A
False
22
Q
The primer coat is most often used to provide weather resistance. T or F
A
False
23
Q
Mixed metal oxide, high silicone cast-iron and scrap steel are example of Galvanic cathodic protection system anodes?
A
False
24
Which of the class cases of corrosive atmospheres would most likely contain sodium chloride? A. Industrial. B. Marine. C. Rural. D. Indoor
B. Marine
25
COD is a test used to directly measure the amount of organic compounds in water. T or F
False
26
Which form of corrosion is best remedied by use of lubrication
Fretting
27
Halide attack occurs when gaseous products from carbides react with hydrogen and High temperatures to form small ruptures in the metal surface. T or F
False
28
Fresh water contains?
B. Contains less than 1% sodium chloride
29
Cathodic protection is used to mitigate corrosion on the internal surface of below ground structures. T or F
False
30
Copper-copper sulfite reference electrodes are most commonly used to measure cathodic protection potentials in soil? T or F
True
31
Which of the following potentials is the most anodic? A. +1.1 V. B. +0.2 V. C. -0.8 V. D. -0.95 V
D. -0.95 V
32
Electrons flow in the metallic path.
True
33
Atmospheric Corrosion rates ... A. Are affected by geographical location. B. Not affected by geographical location. C. Uniform across United States. D. None of the above. E. All of the above
Are affected by geographical location
34
An increase in temperature normally causes corrosion rates to
Increase
35
Biological oxygen demand is a test used to directly measured them out of oxygen and water. T or F
False
36
Nitriding is a process in which ammonia is used to make active nitrogen available to pass on to the metal surface which results in a hard surface. T or F
True
37
Carburization occurs when carbon Atoms are absorbed into the surface of a metal, which develops a higher surface hardness. T or F
True
38
This material is very heat resistant, Corrosion resistant and extremely brittle so it is used for electrical insulators, sandblast nozzles, and high temperature containers. A. Ceramic. B plastic. C. Concrete. D. Titanium
A. Ceramic
39
Natural waters normally have a pH range of? A. 1.0 to 4.5. B. 4.5 to 8.5. C. A .5 to 11.5. D. Let him .5 to 14
B. 4.5 to 8.5
40
The presence of bacteria does not have an effect on the corrosion right.
False
41
Reduction takes place at the cathode. T or F
True
42
Heat treatment does not affect the mechanical properties of metal. T or F
False
43
Airborne salinity is measured with a wet candle apparatus. T or F
True
44
Impress anode back fill serves which of the following purposes? A. Lowers the circuit resistance. B. Promote uniform consumption of the anode C. Extend the life of the anode by being consumed. D. All of the above
D. All of the above
45
Which of the classifications of corrosive atmospheres would most likely contain sulfur and nitrogen oxides? A. Industrial. B. Marine. C. Rural. D. Indoor
A. Industrial
46
The topcoat is primary used to provide adhesion to the substrate. T or F
False
47
Which property is a physical property? A. Ductility. B. Optical behavior. C. Last Tuesday. D. Shear strength
B. Optical behavior
48
Electrons are consumed at the anode. T or F
False
49
Which components will result in the lowest corrosion rate? A. A small anode and a large cathode. B. A large anode and small cathode
B. A large anode and a small cathode
50
Which property is a mechanical property? A castability. B. Magnetic capabilities. C. Ductility. D. Electrical conductivity
C. Ductility
51
This material strong and inexpensive therefor used to build structures such as bridges but is susceptible to freeze thaw cycles? A. Concrete B. Cast-iron. C. Carbon steel D. Ceramic
Concrete
52
Coatings increase the amount of current needed to achieve cathodic protection. T or F
False
53
This material has good electrical and thermal conductivity, low atmospheric corrosion, is very ductile and is attacked by Ammonia, sulfides and erosion corrosion? A. Copper. B. Aluminum. C. Titanium. D. Carbon steel
A. Copper
54
Which surface preparation is called near white blast?
NACE 2
55
At high temperatures, oxidizing environments are less corrosive than reducing environments. T or F
True
56
A decrease in pH normally causes the corrosion rate of steel to
Increase
57
Copper copper sulfate reference electrodes are most commonly used to measure cathodic protection potentials in salt water. T or F
False
58
Electrons are given up at the cathode?
False
59
Airborne salinity is measured with Climat coupons. T or F
False
60
Silver-silver chloride reference electrode are most commonly used to measure cathodic protection potentials in salt water. T or F
True
61
Electrons flow in the metallic path. T or F
True
62
Which form of corrosion is most affected by changes in vapor pressure?
Cavitation
63
Oxidation takes place at the cathode. T or F
False
64
Reduction takes place at the cathode?
True
65
Cathodic protection polarizes the potential of the protective surface in the negative direction. T or F
True
66
Potable water is fresh water that has been sanitized. T or F
True
67
The TDS contains information about the health hazards of the coating. T or F
False
68
At high temperatures, oxidizing environments are more corrosive then reducing environments. T or F
False
69
Galvanic CP systems often use rectifiers is the DC power source. T or F
False
70
Which is used to predict the scaling index for the Great Lakes waters? A. Langelier saturation index. B. Larson-skold index. C. Steph-Davis index. D. Ryznar stability index
A. Larson-Skold Index
71
Which of the following classifications of corrosive atmospheres would most likely contain organic and inorganic dust? A. Industrial. B. Marine C. Rural. D. Indoor
C. Rural
72
Chemical oxygen demand is used to indirectly measure the amount of oxygen in the water. T or F
False
73
Electrons flow in the electrolyte. T or F
False
74
Hydrogen attack occurs when chlorides and halides interfere with the formation of protective oxide or breakdown existing oxides to increase corrosion. T or F
False
75
Dezincification and graphitic are examples of which form of corrosion
Dealloyying
76
At high temperatures, reducing environments are more charoset and oxidizing environments. T or F
True
77
Atmospheric corrosion rates are not affected by airborne salinity. T or F
False
78
Relative humidity is measure with the psychrometer. T or F
True
79
COD is a test used to indirectly measure the amount of organic compounds in water. T or F
True
80
This metal has a very low corrosion rights with caustics and also has low atmospheric rest rates. It is too expensive to use and it's pure form so it is alloyed with many other metals where does also provides resistance to SCC. Is sometimes used plate other metals to provide corrosion protection.
Nickel
81
The MSDS contains information about the health hazards of the coding. T or F
True
82
BOD is a test used to directly measured the organic compounds in water. T or F
False
83
Which surface prep is called industrial blast?
NACE 8
84
The negative wire of the Cathodic protection rectifier should always be connected to-A. The structure under protection. B. The ground bed anodes. C. The electrical ground. D. The lightning rod
A. The structure under protection
85
Which prep is called commercial blast?
NACE3
86
Brackish water
Contains 1 to 2.5% sodium chloride
87
The topcoat is primarily used to provide weather resistance. T or F
True
88
Polymeric Materials are not subject to Atmospheric corrosion. T or F
False
89
Which surface prep is called brushoff blast
NACE 4
90
Coatings reduce the amount of current needed to achieve cathodic protection. T or F
True
91
This material strong and inexpensive therefore used to build structures such as bridges. It is attacked by acids and susceptible to freeze-thaw cycles
Concrete
92
Electrons are given up at the anode? T or F
True
93
The presence of bacteria does not have an effect on the corrosion rate. T or F
False
94
Corrosion inhibitors mitigate internal corrosion by stopping all chemical reactions. T or F
False
95
Carburization occurs when gas some carbides react with hydrogen at high temperatures to form small ruptures and the metal surface. T or F
False
96
A parabolic corrosion curve is the most desirable. T or F
True
97
An increase in pH normally causes the corrosion rate of steel to
Decrease
98
As pollutants and contaminants increase, corrosion rates normally
Increase
99
Polarization of the cathode usually causes corrosion rights to
Decrease
100
Which is the following the most common preventative measure for underground corrosion. E. Protective coatings. B. Cathodic protection. C. Chemical inhibitors. D. Material selection. E. Structural design
Cathodic protection
101
Heat treatment does not affect the mechanical properties of a metal. T or F
False
102
This material is divided into two groups with a large variety of properties. one group Will soften when heated; the other will harden when heated? A. Plastic. B. Rubber. C. Ceramic. D. Aluminum
A. Plastic
103
This is the lowest cost first material which is quite brutal susceptible to graphitization. It is also difficult to well but has excellent erosion corrosion resistance to do it's hardness
Cast-iron
104
Distilled or demineralized water is fresh water that has been sanitized. T or F
False
105
TOW is measured when - A the humidity is greater than 80%. B. The movie is less than 80%. C. The temperature is greater than 0°C. D. The temperature is less than 0°C. E. Both A and C. F. Both B and C
E. Both A & C
106
This material is used batteries because it's corrosion properties and sulfuric acid. It is also a toxic metal that can be hazardous if it's fumes or dust are ingested.
Lead
