Effect of seawater and salt-rich air on the dielectric properties of BaTiO3 and Ni-BaTiO3 MLCC
BaTiO3 ceramic and 82 nF Ni-BaTiO3 MLCC were placed in seawater and salt-rich air.Impedance ana-lyzer,SEM and EDS were used to investigate the properties and corrosion mechanism of BaTiO3 ceramic and 82 nF MLCC after treatment for 0h,24 h,48 h and 72 h.The results show that when BaTiO3 ceramic is placed in seawater,the relative dielectric constant and dielectric loss of BaTiO3 ceramic increase at different low frequen-cies(102-103 Hz),and the increase amplitude is huge.Obvious protective film is generated on the surface of the ceramic in 24 h.The variation range of dielectric properties within 72 h is small,and there is no obvious protec-tive film on the surface,but there are certain corrosion traces.The high frequency(105-106 Hz)capacitance val-ue and dielectric loss of 82 nF MLCC placed in seawater and salt-rich air for 72 h changes significantly,which is caused by salt immersion in the internal crystallization,but there is also no protective film on its surface,which may be related to the oxide coating on the capacitor surface.
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