磷酸三甲酯添加剂对铝箔腐蚀隧道孔形成的影响  

Effect of trimethyl phosphate additives on etched tunnel formation of aluminum foils

作　　者：翟开勇 李慧斌 梁力勃 ZHAI Kaiyong;LI Huibin;LIANG Libo(Guangxi Hezhou Guidong Electronic Technology Co.,Ltd.,Hezhou542800,Guangxi Zhuang Autonomous Region,China)

机构地区：[1]广西贺州市桂东电子科技有限责任公司,广西贺州542800

出　　处：《电子元件与材料》2024年第5期544-550,共7页Electronic Components And Materials

基　　金：广西科技重大专项(桂科AA23062025);广西重点研发计划(桂科AB21196006)。

摘　　要：目前,铝电解电容器通过电化学腐蚀发孔工艺来制造阳极铝箔,以获得高面密度的隧道孔,从而提升比表面积和比电容。然而,腐蚀发孔过程中出现严重的孔并和隧道孔分布不均匀的问题,严重限制了阳极铝箔的比电容提升。为解决该问题,通过在腐蚀发孔溶液中添加磷酸三甲酯(TMP)来调控隧道孔的形核位点。适宜浓度的TMP一方面能够降低腐蚀发孔溶液的表面张力,改善阳极铝箔和腐蚀发孔溶液的润湿性;另一方面,润湿性的改善直接导致铝箔表面均匀溶解的阻力降低,从而显著降低隧道孔形核的阻力,最终改善腐蚀铝箔的比表面积。通过形貌表征和统计分析发现,在添加质量分数1%TMP的腐蚀发孔溶液中,铝箔腐蚀发孔时的隧道孔分布均匀性得到了显著改善,相较于没有添加TMP的空白样品,比表面积提升了约50%。本项研究为制造高性能的阳极铝箔提供了一种新的思路和方法。Anode aluminum foils used in the aluminum electrolytic capacitors are typically produced through the electrochemical tunnel etching process,which aims to create a high density of etched tunnels in order to increase the specific surface area and specific capacitance.However,the presence of the merged tunnels and uneven distribution of tunnels severely hinder the improvement of the specific capacitance for the etched aluminum foil.To address this issue,the nucleation sites of tunnels were controlled by adding trimethyl phosphate(TMP)as an additive into the etchant.The addition of an appropriate concentration of TMP has dual effects.Firstly,it reduces the surface tension of the etchant and improves the wettability between the aluminum foil and etchant.Secondly,this improved wettability directly decreases the dissolution resistance of the aluminum foil surface,leading to a significant reduction in the nucleation resistance of etched tunnels.As a result,the specific surface area of the etched aluminum foil is substantially increased.The morphology characterization and statistical analysis results confirm that the addition of 1%(mass fraction)TMP in the etchant greatly improves the uniformity of tunnel distribution during the electrochemical etching process.Moreover,the specific surface area of the etched aluminum foil is enhanced by approximately 50%compared to the blank sample.This research provides novel insights for the production of high-performance anode aluminum foils and demonstrates the efficacy of using TMP as an additive to regulate the formation of the etched tunnels.

关 键 词：铝箔 磷酸三甲酯 润湿性 点蚀 比电容 铝电解电容器 

分 类 号：TM535[电气工程—电器]