(1. 北京科技大學(xué) 北京市腐蝕、磨蝕與表面技術(shù)重點(diǎn)實(shí)驗(yàn)室，北京 100083；
2. 廣西賀州市桂東電子科技有限責(zé)任公司，賀州 542800)
摘 要: 采用堿洗除去鋁箔表面的富鉛層，在其表面沉積出高度彌散的錫晶核，通過掃描電鏡觀察鋁箔表面沉積錫晶核的分布，并對(duì)鋁箔腐蝕后的表面形貌以及對(duì)腐蝕孔孔徑大小進(jìn)行統(tǒng)計(jì)。結(jié)合極化曲線測(cè)量鋁箔的腐蝕電位，研究電沉積彌散錫晶核對(duì)高壓陽極鋁箔電解腐蝕特性的影響。結(jié)果表明：沉積錫晶核的電流密度越大，鋁箔表面得到的錫晶核面密度越高，晶核越細(xì)小；彌散的錫晶核能夠和鋁基體組成腐蝕微電池，有效地引導(dǎo)鋁箔腐蝕發(fā)孔，提高鋁箔發(fā)孔的均勻性，從而提高鋁箔的比電容；相對(duì)于表面富鉛的鋁箔，電沉積彌散錫晶核的鋁箔表面微電池?cái)?shù)量顯著下降，使得腐蝕電位提高，鋁箔表面未沉積錫晶核處表面活性低，從而導(dǎo)致鋁箔的腐蝕減薄減少。
關(guān)鍵字: 電解電容器；高壓鋁箔；錫晶核；比電容
（1. Beijing Key Laboratory for Corrosion, Erosion and Surface Technology,
University of Science and Technology Beijing, Beijing 100083, China;
2. Guangxi Hezhou Guidong Electronics Technology Company Limited, Hezhou 542800, China）
Abstract:The trace amount of lead at the surface of Al foils was removed by alkaline washing, and then, the tin nuclei were electrodeposited on the surface. The surface morphologies of the Al foils electrodeposited tin nuclei were observed by scanning electron microscopy. The size distribution of pits was calculated and the corrosion potential was analyzed by polarization curve. The influence of electrodepositing tin nuclei on the etching ability was studied. The results show that the surface density of the tin nuclei increases with the current density increase, and accompany with the volume of nuclei decreasing. The tin nuclei can form a lot of micro-batteries with Al foils so as to effectively initiate pitting, which promote the uniform distribution of pits and increase the specific capacitance of etched Al foils. Compared with lead-riched Al foils at the surface, the numbers of micro-batteries of the Al foils electrodeposited tin nuclei are far less than that of the lead-riched Al foils at the surface, which can decrease the corrosion thickness of the Al foils.
Key words: electrolytic capacitor; high voltage aluminum foil; tin nuclei; specific capacitance
