Can a potentiostat be used to measure corrosion? Why also used to measure corrosion, potentiostat is only a few thousand, and electrochemical workstation to tens of thousands?

Do impedance you now have a potentiostat, so you also need a frequency generator, if there should be used together can make another, the sea potentiostat and frequency generator are not good, if the general measurement that can be, to high precision data, potentiostat first AMTEK, frequency generator preferred Solartron