ウォータドロップ試験における電気化学反応電気量よるマイグレーション感受性評価

抄録

Electrochemical migration is the phenomenon that the electric circuits are shorted by anode dissolution or cathode extraction on a conductor metal surface, when an electric field is done under humidity environment. The growth of an electrochemical migration is largely influenced by a kind of the conductor materials, the insulation resistance between the conductors, or the strength of electric field, because this electrochemical migration is based on the electricity chemical reaction on the surface of conductor material. Noticing to that an electrochemical migration is the electricity chemical reaction associated with transfer of electric charge on a conductor metal surface, in this research it examines about an electrochemical migration evaluation method from an electric charge volume based on potential distribution between a conductor. A current concentration degree in an edge department of an electrode can be made 2 times of electrode parallel departments, by using a electrode with trapezoidal shape. And then, by this current concentration, an occurent place of an electrochemical migration is fixed and the state of voltage potential is difficult to be influenced by other electrode parts. Now, considerating the critical current value for electrochemical reaction instead of the critical voltage potential, electric charge for occurrence of migration can be calculated by leak current above an critical current value. It is conceivable that a case as a standard evaluation scale is possible, to become the criticism value that an electric charge volume reflected insulation resistance between conductors or surface condition of a conductor.