(中南大學(xué) 材料科學(xué)與工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 采用掃描電子顯微鏡、 透射電鏡分析和腐蝕量試驗(yàn), 研究了高溫退火對(duì)鋁箔第二相形貌及分布和對(duì)陰極箔腐蝕性能的影響。 結(jié)果表明： 3003合金中第二相粒子呈條狀時(shí), 其周圍基體中的位錯(cuò)密度分布不均, 尖角部位位錯(cuò)密度高, 成為優(yōu)先腐蝕的區(qū)域, 導(dǎo)致陰極箔腐蝕形貌不均, 易發(fā)生剝落腐蝕； 第二相粒子呈球狀且彌散分布時(shí), 陰極箔的腐蝕均勻性好, 無(wú)剝落腐蝕； 在630℃高溫下退火, 第二相發(fā)生溶解, 并在空冷時(shí)重新析出, 重新析出的第二相數(shù)目減少, 形狀細(xì)小且彌散分布在基體中, 從而提高了鋁箔的抗腐蝕性能和腐蝕均勻性。 630℃退火4h為最佳工藝。
關(guān)鍵字: 陰極鋁箔； 高溫退火； 腐蝕性能
YOU Jiang-hai, ZHOU Zhuo-ping
（School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract:The effects of high temperature annealing on the morphology and distribution of second phases and on the corrosion property of cathode aluminium foil were investigated by means of mass loss experiment, SEM and TEM. The results show that when the second phase particle has high aspect ratio, the dislocation density in the sharp corner region is very high, so the corrosion of the matrix near this region is preferential and the denudation will take place easily; when the second phase particle is spherical and is distributed dispersedly, the corrosion of cathode aluminium foil is uniform and the denudation will not take place. While the foil is annealed at high temperature, the second phases have small aspect ratio and distribute dispersedly. Therefore, the corrosion resistance and the corrosion uniformity of cathode aluminium foil can be improved by annealing at 630℃ for 4h.
Key words: electrolytic capacitor cathode foils； annealing； corrosion property
