Explanation of Salt Spray Test (CCT) Cycles

  • Hot, humid air is created by bubbling compressed air through a bubble (humidifying) tower containing hot deionized water.
  • Salt solution is moved from the 60-gallon reservoir through a filter to the nozzle by a gravity-fed system.
  • When the hot, humid air and the salt solution mix at the nozzle, it is atomized into a corrosive fog. The fog is distributed by the Unifog dispersion system.
  • Strip heaters maintain the programmed set-point temperature of the salt spray test.

 High Humidity Cycle

During the humidity cycle, the chamber operates much like the salt fog cycle, except that deionized water is fed to the atomizer nozzle rather than a salt solution. This creates a 100% relative humidity condition in the exposure zone.

 Dry Cycle

For a low humidity state in the exposure zone of the chamber, air is forced into the exposure zone via a blower motor which directs air over the energized chamber heaters. Chamber temperature is set by the user and controlled by the chamber controller.



 Ambient Cycle:


 Dwell Cycle:

During the Dwell Cycle, no action is taken by any of the chamber components.


Cyclic corrosion test chambers optional cycles

Controlled Humidity Cycle: (Optional)

  • A solid-state humidity sensor reads the current humidity condition and compares that to the humidity set-point in the controller.
  • A mechanism used to control the humidity moves chamber air via a blower motor and passes it over a heater coil in the bottom of the chamber with an atomizer nozzle fogging into the air stream.
  • As humidity is needed, the controller pulses the atomizer nozzle on and off while recirculating the air flow.


 Solution Spray Cycle: (Optional)

Solution is taken from the holding tank via a solution pump and driven through a spray bar header inside the exposure zone onto the parts with multiple spray nozzles.  This is an option depending on the salt spray test you need to run.



 Immersion Cycle: (Optional)

A series of valves, float switches, and a pump move solution from a heated holding tank into the exposure zone via the chamber drain. Once this cycle is over, the process reverses and moves the solution out of the exposure zone and back into the holding tank.