Chapter 6 Environmental Testing Flashcards

1
Q
  1. Identify some of the defects that can be caused by incorrect application temperatures.
A
  • Blistering
  • Pin holing
  • Cratering
  • Dry Spray
  • Mud Cracking
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2
Q
  1. Describe relative humidity.
A

Relative humidity is a measure of the amount of moisture in the air compared to saturation level.

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3
Q
  1. What is the dew point temperature?
A

Dew Point is the temperature at which moisture begins to form on a steel surface.

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4
Q
  1. Name some of the effects wind may have on a coating project.
A
  • Blow abrasives past the boundaries of the abrasive-blast work area to an area where coating are being applied
  • Cause excessive drift or overspray of sprayed coatings
  • Accelerates solvent evaporation after application
  • Contribute to the formation of dry spray
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5
Q
  1. What are some of the common errors when using an electronic hygrometer?
A

Operator-based errors: the reading was taken in direct sunlight, the instrument was left in place too long, or removed before it stabilized
Equipment-based errors: calibration or equipment malfunctions

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6
Q
  1. Explain the process for use of the sling psychrometer.
A

To use the sling psychrometer:
• Saturate the sock with clean water.
• Whirl the instrument rapidly for about 40 seconds.
• Read the wet-bulb temperature.

Repeat the process (spin and read without additional wetting) until the temperature stabilizes

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