We fabricated silver–carbon nanotube (Ag–CNT) composite plating films and prepared samples after a H2S gas corrosion test. After corrosion, although the elastic modulus of Ag film increased 1.9 times, there was no marked difference in the mechanical characteristic of Ag–CNT film. At a low load, for the Ag–CNT film after corrosion, there was no polarity and the contact resistance was low and ohmic, although the contact resistance of Ag film after corrosion was high and polar. Therefore, Ag–CNT film can be considered as a promising material for next-generation electrical contact applications.