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Intro To Corrosion > FINAL > Flashcards

FINAL Flashcards

0
Q

Relative humidity is measured with a wet candle apparatus. T or F

A

False

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1
Q

Logarithmic corrosion curve is the most desirable. T or F

A

False

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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

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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

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4
Q

What surface preparation is white metal blast?

A

NACE 1

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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

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6
Q

Which surface preparation is called industrial blast

A

NACE 8

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7
Q

Which property is a physical property? A tensile strength. B. Hardness. C. Fatigue strength. D. Density.

A

D density

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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

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9
Q

Atmospheric corrosion is most often controlled by design or material selection. T or F

A

False

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10
Q

Polarization of the cathode usually causes corrosion rates to?

A

B decrease

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11
Q

Which surface preparation is called brush off blast?

A

NACE 4

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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

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13
Q

Scale formation is not affected by pH

A

False

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14
Q

As pollutants and contaminants decrease, corrosion rates normally?

A

Decrease

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15
Q

Airborne salinity is measured with a psychrometer. T or F

A

False

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16
Q

Potable water is water that has the mineral content removed. T or F

A

False

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17
Q

Seawater contains

A

D. Contains about 3.5% sodium chloride

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18
Q

COD is a test used to in directly measure the amount of organic compounds in water. T or F

A

True

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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

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20
Q

I CCP systems often use rectifiers as the DC power source. T or F

A

True

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21
Q

At high temperatures, reducing environments are less corrosive than oxidizing environments? T or F

A

False

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22
Q

The primer coat is most often used to provide weather resistance. T or F

A

False

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23
Q

Mixed metal oxide, high silicone cast-iron and scrap steel are example of Galvanic cathodic protection system anodes?

A

False

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24
Q

Which of the class cases of corrosive atmospheres would most likely contain sodium chloride? A. Industrial. B. Marine. C. Rural. D. Indoor

A

B. Marine

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25
Q

COD is a test used to directly measure the amount of organic compounds in water. T or F

A

False

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26
Q

Which form of corrosion is best remedied by use of lubrication

A

Fretting

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27
Q

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

A

False

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28
Q

Fresh water contains?

A

B. Contains less than 1% sodium chloride

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29
Q

Cathodic protection is used to mitigate corrosion on the internal surface of below ground structures. T or F

A

False

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30
Q

Copper-copper sulfite reference electrodes are most commonly used to measure cathodic protection potentials in soil? T or F

A

True

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31
Q

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

A

D. -0.95 V

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32
Q

Electrons flow in the metallic path.

A

True

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33
Q

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

A

Are affected by geographical location

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34
Q

An increase in temperature normally causes corrosion rates to

A

Increase

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35
Q

Biological oxygen demand is a test used to directly measured them out of oxygen and water. T or F

A

False

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36
Q

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

A

True

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37
Q

Carburization occurs when carbon Atoms are absorbed into the surface of a metal, which develops a higher surface hardness. T or F

A

True

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38
Q

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

A. Ceramic

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39
Q

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

A

B. 4.5 to 8.5

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40
Q

The presence of bacteria does not have an effect on the corrosion right.

A

False

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41
Q

Reduction takes place at the cathode. T or F

A

True

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42
Q

Heat treatment does not affect the mechanical properties of metal. T or F

A

False

43
Q

Airborne salinity is measured with a wet candle apparatus. T or F

A

True

44
Q

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

A

D. All of the above

45
Q

Which of the classifications of corrosive atmospheres would most likely contain sulfur and nitrogen oxides? A. Industrial. B. Marine. C. Rural. D. Indoor

A

A. Industrial

46
Q

The topcoat is primary used to provide adhesion to the substrate. T or F

A

False

47
Q

Which property is a physical property? A. Ductility. B. Optical behavior. C. Last Tuesday. D. Shear strength

A

B. Optical behavior

48
Q

Electrons are consumed at the anode. T or F

A

False

49
Q

Which components will result in the lowest corrosion rate? A. A small anode and a large cathode. B. A large anode and small cathode

A

B. A large anode and a small cathode

50
Q

Which property is a mechanical property? A castability. B. Magnetic capabilities. C. Ductility. D. Electrical conductivity

A

C. Ductility

51
Q

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

A

Concrete

52
Q

Coatings increase the amount of current needed to achieve cathodic protection. T or F

A

False

53
Q

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

A. Copper

54
Q

Which surface preparation is called near white blast?

A

NACE 2

55
Q

At high temperatures, oxidizing environments are less corrosive than reducing environments. T or F

A

True

56
Q

A decrease in pH normally causes the corrosion rate of steel to

A

Increase

57
Q

Copper copper sulfate reference electrodes are most commonly used to measure cathodic protection potentials in salt water. T or F

A

False

58
Q

Electrons are given up at the cathode?

A

False

59
Q

Airborne salinity is measured with Climat coupons. T or F

A

False

60
Q

Silver-silver chloride reference electrode are most commonly used to measure cathodic protection potentials in salt water. T or F

A

True

61
Q

Electrons flow in the metallic path. T or F

A

True

62
Q

Which form of corrosion is most affected by changes in vapor pressure?

A

Cavitation

63
Q

Oxidation takes place at the cathode. T or F

A

False

64
Q

Reduction takes place at the cathode?

A

True

65
Q

Cathodic protection polarizes the potential of the protective surface in the negative direction. T or F

A

True

66
Q

Potable water is fresh water that has been sanitized. T or F

A

True

67
Q

The TDS contains information about the health hazards of the coating. T or F

A

False

68
Q

At high temperatures, oxidizing environments are more corrosive then reducing environments. T or F

A

False

69
Q

Galvanic CP systems often use rectifiers is the DC power source. T or F

A

False

70
Q

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

A. Larson-Skold Index

71
Q

Which of the following classifications of corrosive atmospheres would most likely contain organic and inorganic dust? A. Industrial. B. Marine C. Rural. D. Indoor

A

C. Rural

72
Q

Chemical oxygen demand is used to indirectly measure the amount of oxygen in the water. T or F

A

False

73
Q

Electrons flow in the electrolyte. T or F

A

False

74
Q

Hydrogen attack occurs when chlorides and halides interfere with the formation of protective oxide or breakdown existing oxides to increase corrosion. T or F

A

False

75
Q

Dezincification and graphitic are examples of which form of corrosion

A

Dealloyying

76
Q

At high temperatures, reducing environments are more charoset and oxidizing environments. T or F

A

True

77
Q

Atmospheric corrosion rates are not affected by airborne salinity. T or F

A

False

78
Q

Relative humidity is measure with the psychrometer. T or F

A

True

79
Q

COD is a test used to indirectly measure the amount of organic compounds in water. T or F

A

True

80
Q

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.

A

Nickel

81
Q

The MSDS contains information about the health hazards of the coding. T or F

A

True

82
Q

BOD is a test used to directly measured the organic compounds in water. T or F

A

False

83
Q

Which surface prep is called industrial blast?

A

NACE 8

84
Q

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

A. The structure under protection

85
Q

Which prep is called commercial blast?

A

NACE3

86
Q

Brackish water

A

Contains 1 to 2.5% sodium chloride

87
Q

The topcoat is primarily used to provide weather resistance. T or F

A

True

88
Q

Polymeric Materials are not subject to Atmospheric corrosion. T or F

A

False

89
Q

Which surface prep is called brushoff blast

A

NACE 4

90
Q

Coatings reduce the amount of current needed to achieve cathodic protection. T or F

A

True

91
Q

This material strong and inexpensive therefore used to build structures such as bridges. It is attacked by acids and susceptible to freeze-thaw cycles

A

Concrete

92
Q

Electrons are given up at the anode? T or F

A

True

93
Q

The presence of bacteria does not have an effect on the corrosion rate. T or F

A

False

94
Q

Corrosion inhibitors mitigate internal corrosion by stopping all chemical reactions. T or F

A

False

95
Q

Carburization occurs when gas some carbides react with hydrogen at high temperatures to form small ruptures and the metal surface. T or F

A

False

96
Q

A parabolic corrosion curve is the most desirable. T or F

A

True

97
Q

An increase in pH normally causes the corrosion rate of steel to

A

Decrease

98
Q

As pollutants and contaminants increase, corrosion rates normally

A

Increase

99
Q

Polarization of the cathode usually causes corrosion rights to

A

Decrease

100
Q

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

A

Cathodic protection

101
Q

Heat treatment does not affect the mechanical properties of a metal. T or F

A

False

102
Q

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

A. Plastic

103
Q

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

A

Cast-iron

104
Q

Distilled or demineralized water is fresh water that has been sanitized. T or F

A

False

105
Q

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

A

E. Both A & C

106
Q

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.

A

Lead

Intro To Corrosion (4 decks)

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