Formation method of positive foil for capacitor of spot welding machine

The invention discloses a formation method of a positive foil for a capacitor of a spot welding machine. The formation method comprises the steps of boiling, four-stage formation, thermal processing,phosphoric acid processing, repairing, formation, post-processing and drying. The formation method has an innovative point that citric acid and an ammonium salt solution thereof are employed in boiling to form a boiling processing liquid, short-time boiling processing is performed, low-temperature formation is performed, the prepared positive foil oxide film basically does not contain a porous aluminum hydroxide outer layer, has the characteristics of low loss, current impact resistance and good temperature rising resistant characteristic, is equivalent stable in lifetime characteristic and issuitably used for fabricating the capacitor of the spot welding machine, and a convention positive foil cannot be compatible. 本发明公开了种点焊机电容器用阳极箔的化成方法，包括煮沸处理、四级化成、热处理、磷酸处理、再修复化成、后处理、烘干。其创新点在于:煮沸处理采用柠檬酸及其铵盐溶液组成煮沸处理液、短时间煮沸处理，然后低温