本文探讨了微量元素提高电容铝箔K值的实质,通过实验征实;K值的提高并不是由于晶粒的细化。K值与位错具有更直接的关系,位错密度高K值也高;同时证实腐蚀首先从位错露头处开始。从实验结果看,K值与金属基体成份不均匀、应力不均匀所引起的微电池作用有密切联系。 This article explored the essence of trace elements to improve the value of the capacitor aluminum foil K, confirmed by experiments; K value is not increased due to grain refinement. K value has a more direct relationship with the dislocation, and the higher the dislocation density, the higher the K value. At the same time, it is confirmed that the corrosion begins with the outcrop of the dislocation. From the experimental results, K values ​​and metal matrix composition is uneven, uneven stress caused by the role of micro-cells are closely linked.