LAUSR

Atmospheric corrosion behavior of tin under an alternating current electric field (ACEF) was investigated by electrochemical and surface analysis techniques. The results indicated that the corrosion rate of tin increased with increased amplitude and frequency of ACEF, which could be attributed to the destruction of tin surface film, and the acceleration of the migration of ions and the asymmetry polarization of tin. Furthermore, tin corrosion was more severe under a square wave ACEF than a sinusoidal wave ACEF with the same amplitude and frequency, which could be explained by the duration for the maximum disturbance potential of the square wave ACEF being longer than that for the sinusoidal wave ACEF. Under ACEF, the contribution of leakage current to the tin corrosion rate was much greater than that of electric field gradient, which could be attributed to the leakage current not only accelerating the migration of ions, but also promoting the damage of the tin surface film and causing the asymmetry polarization of tin.