(北京科技大學(xué) 材料學(xué)系， 北京 100083)
摘 要: 采用立方織構(gòu)定量檢測以及掃描電子顯微鏡下觀察腐蝕結(jié)構(gòu)等手段， 對比了不同微量Mg元素含量的高壓電解電容器陽極鋁箔在織構(gòu)和腐蝕結(jié)構(gòu)上的差別， 研究了Mg含量對高壓電解電容器陽極鋁箔比電容的影響。 分析表明： Mg含量從0.0001%提高到0.0014%時(shí)， Mg會(huì)更多富集于鋁箔表面， 促使腐蝕形成的氧化膜中出現(xiàn)含Mg的復(fù)合氧化物微小顆粒， 進(jìn)而引起腐蝕隧道的側(cè)向發(fā)展； 頻繁的側(cè)向發(fā)展可導(dǎo)致表層腐蝕組織剝落， 進(jìn)而使鋁箔在500V的比電容從7.3×10-3F/m2降低到4.3×10-3F/m2。
關(guān)鍵字: 電解電容器；鋁箔； 腐蝕； 鎂
high voltage aluminum foil
（Department of Materials, University of Science and Technology Beijing,
Beijing 100083, China）
Abstract:The cube texture and corrosion structure of aluminum anode foil for high voltage electrolytic capacitor containing trace Mg were investigated based on quantitative cube texture analysis and microstructure observation under scanning electron microscope. The effect of Mg content on specific capacity of the foils was also studied. It is deduced that the difference on corrosion structure is related to the content of trace Mg. When Mg content is increased from 0.0001% to 0.0014%, Mg will concentrate severely on the surface layer and will lead to the formation of oxide particles containing Mg. The complex oxide particles can result in development of etching tunnel in side directions. The surface corrosion layer will flake off and the specific capacity of the foils at 500V will be reduced from 7.3×10-3F/m2 to 4.3×10-3 F/m2, if the frequency of the side development of etching tunnel is high enough.
Key words: electrolytic capacitor; aluminum foil; corrosion; Mg
