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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.

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Chemical resistance of electroless-deposited nickel–tin–phosphorus (Ni–Sn–P) with a high Sn content (>30 at. %) and Ni–P layer on a cold-rolled commercial steel plate (SPCC) against a 5% aq solution of sodium hypochlorite (NaClO aq), which was used as a disinfectant solution, was examined. After immersion of Ni–Sn–P and Ni–P layers at 25 °C for 72 h to NaClO aq, the surface of the Ni–P layer showed a clearly corroded surface. On the other hand, the Ni–Sn–P layers were not corroded, so the Ni–Sn–P layers have chemical resistance properties against NaClO aq. The importance of the Sn addition to Ni layers for NaClO chemical resistance was confirmed. In addition, the chemical resistance of the Ni–Sn–P layers against hydrogen sulfide (H2S) gas and nitrogen acid (HNO3) vapor was also determined.