Electrode Potential Analysis on Tungsten Contacts Surface Film

The main content of tungsten contacts is tungsten (W), i.e. electrode potential analysis on tungsten contacts surface film can be available from tungsten analysis.
Standard electrode potential is a kind of equilibrium electrode potential, and each substance has this feature.
Standard electrode potential refers to: placing a substance in a solution containing its ions, if the ion concentration in the solution is 1g / L, the potential difference between the substance and standard hydrogen electrode is standard electrode potential. If negative value of standard electrode potential is bigger, the metal will be more active; If the positive value is larger, the metal will be less lively.

At the temperature of 25 ℃, the standard electrode potential of several metals table

From the above table, which shows that the potential difference between the electrode W and Cu is 0.54V, in a condition of high temperatures and high humidity, the contacts material’s electrochemical corrosion is prone to appear. Whereas the phenomenon on W and Ni corrosion is more slight than W and Cu, W and Ag, because the potential difference between the electrodes W and Ni is only 0.03V, whose electrochemical corrosion is not easy to take place. So, the right amount of Ni can be added to tungsten contacts to increase its oxidation resistance capacity, that is to say, reducing the likelihood of its surface film formation.

 

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