Semiconducting Behavior of Carbon Steel and Epoxyresin Varnish in Different Solutions

The semiconducting behavior of 20 carbon steel in acid,alkali and salt solutions was studied by utilizing potential-capacitance and Mott-Schottky analysis methods.The results showed that the capacitance variation of space charge layer of 20 carbon steel in different solutions methods was different.The carbon steel showed p-type semiconducting behavior in 5% sulfuric acid and 5% sodium sulfate solution.However,the carbon steel showed n-type semiconducting behavior in 5% sodium hydroxide and formed two space charge layers.The epoxy resin varnish showed semiconducting behavior in different electrolyte solutions and exhibitea transformation from insulating state to semiconducting state.