What are corrosion chambers usually used for?
The standard relative humidity chamber (RHC) creates a local, 80 litre, environment whereby the relative humidity (RH) can be adjusted within 1% and we have an optional sample heater working from room temperature to 115˚C, both can be automatically controlled.
The RHC can also act as a light enclosure with light source either integral or piped in via semi flexible fibre optic tube. The light sources can be optionally controlled in terms of intensity and wavelength for Surface Photovoltage Spectroscopy. We have both DC and AC SPV modes.
For metals the RHC would be used to measure the corrosion potential (changes in electrochemical potential) under standard condition.
[For example measuring specific metal samples versus varying RH levels both on cleaned surfaces and surfaces covered with a thin chemical layer.]
For some insulating surfaces (or dielectric) RH control is necessary to dissipate surface charge.
For some solar cells the surface and interface trapping constants are very sensitive to cell temperature, i.e. Voc and solar cell fill factor is affected. For some organic semiconductors control of RH during measurement is required. We have also encountered other forensic projects where RH control is required.
Lastly the chambers are sufficiently large (and the bottom is an optical table with mounting holes) to permit mounting of other equipment and easy mounting/dismounting of samples.