FINAL Flashcards
Relative humidity is measured with a wet candle apparatus. T or F
False
Logarithmic corrosion curve is the most desirable. T or F
False
Mixed metal oxide, High silicon cast-iron and scrap steel or examples of impressed current cathodic protection system and notes. T or F
True
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
What surface preparation is white metal blast?
NACE 1
Carburization occurs when carbon atoms are absorbed into the surface of the metal which develops a softer surface. T or F
False
Which surface preparation is called industrial blast
NACE 8
Which property is a physical property? A tensile strength. B. Hardness. C. Fatigue strength. D. Density.
D density
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
Atmospheric corrosion is most often controlled by design or material selection. T or F
False
Polarization of the cathode usually causes corrosion rates to?
B decrease
Which surface preparation is called brush off blast?
NACE 4
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
Scale formation is not affected by pH
False
As pollutants and contaminants decrease, corrosion rates normally?
Decrease
Airborne salinity is measured with a psychrometer. T or F
False
Potable water is water that has the mineral content removed. T or F
False
Seawater contains
D. Contains about 3.5% sodium chloride
COD is a test used to in directly measure the amount of organic compounds in water. T or F
True
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
I CCP systems often use rectifiers as the DC power source. T or F
True
At high temperatures, reducing environments are less corrosive than oxidizing environments? T or F
False
The primer coat is most often used to provide weather resistance. T or F
False
Mixed metal oxide, high silicone cast-iron and scrap steel are example of Galvanic cathodic protection system anodes?
False
Which of the class cases of corrosive atmospheres would most likely contain sodium chloride? A. Industrial. B. Marine. C. Rural. D. Indoor
B. Marine
COD is a test used to directly measure the amount of organic compounds in water. T or F
False
Which form of corrosion is best remedied by use of lubrication
Fretting
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
Fresh water contains?
B. Contains less than 1% sodium chloride
Cathodic protection is used to mitigate corrosion on the internal surface of below ground structures. T or F
False
Copper-copper sulfite reference electrodes are most commonly used to measure cathodic protection potentials in soil? T or F
True
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
Electrons flow in the metallic path.
True
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
An increase in temperature normally causes corrosion rates to
Increase
Biological oxygen demand is a test used to directly measured them out of oxygen and water. T or F
False
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
Carburization occurs when carbon Atoms are absorbed into the surface of a metal, which develops a higher surface hardness. T or F
True
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
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
The presence of bacteria does not have an effect on the corrosion right.
False
Reduction takes place at the cathode. T or F
True