Flashcards in FINAL Deck (107)
Logarithmic corrosion curve is the most desirable. T or F
Relative humidity is measured with a wet candle apparatus. T or F
Mixed metal oxide, High silicon cast-iron and scrap steel or examples of impressed current cathodic protection system and notes. T or F
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
What surface preparation is white metal blast?
Carburization occurs when carbon atoms are absorbed into the surface of the metal which develops a softer surface. T or F
Which surface preparation is called industrial blast
Which property is a physical property? A tensile strength. B. Hardness. C. Fatigue strength. 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
Polarization of the cathode usually causes corrosion rates to?
Which surface preparation is called brush off blast?
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.
Scale formation is not affected by pH
As pollutants and contaminants decrease, corrosion rates normally?
Airborne salinity is measured with a psychrometer. T or F
Potable water is water that has the mineral content removed. T or F
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
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
At high temperatures, reducing environments are less corrosive than oxidizing environments? T or F
The primer coat is most often used to provide weather resistance. T or F
Mixed metal oxide, high silicone cast-iron and scrap steel are example of Galvanic cathodic protection system anodes?
Which of the class cases of corrosive atmospheres would most likely contain sodium chloride? A. Industrial. B. Marine. C. Rural. D. Indoor
COD is a test used to directly measure the amount of organic compounds in water. T or F
Which form of corrosion is best remedied by use of lubrication
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
Fresh water contains?
B. Contains less than 1% sodium chloride