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Flashcards in FINAL Deck (107)
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0

Logarithmic corrosion curve is the most desirable. T or F

False

1

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

False

2

Mixed metal oxide, High silicon cast-iron and scrap steel or examples of impressed current cathodic protection system and notes. T or F

True

3

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

Chemical inhibitors

4

What surface preparation is white metal blast?

NACE 1

5

Carburization occurs when carbon atoms are absorbed into the surface of the metal which develops a softer surface. T or F

False

6

Which surface preparation is called industrial blast

NACE 8

7

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

D density

8

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

D. All of the above

9

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

False

10

Polarization of the cathode usually causes corrosion rates to?

B decrease

11

Which surface preparation is called brush off blast?

NACE 4

12

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. Aluminum

13

Scale formation is not affected by pH

False

14

As pollutants and contaminants decrease, corrosion rates normally?

Decrease

15

Airborne salinity is measured with a psychrometer. T or F

False

16

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

False

17

Seawater contains

D. Contains about 3.5% sodium chloride

18

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

True

19

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. +1.1 volts

20

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

True

21

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

False

22

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

False

23

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

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