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    • 19. 发明专利
    • Electrolytic corrosion of solder
    • 焊膏电解腐蚀
    • JPS5770299A
    • 1982-04-30
    • JP14405080
    • 1980-10-15
    • Fuji Electric Co Ltd
    • SAGA MISAOMATSUZAKI KAZUOTAKAYAMA TOKIO
    • C25F3/02H05K3/07
    • H05K3/07
    • PURPOSE: To subject a solder to electrolytic corrosion at a high speed without selectively corroding alloy components thereof, in subjecting the solder as anode to electrolytic corrosion in an electrolyte, by containing a phenol sulfonate of Sn and Pb in said electrolyte.
      CONSTITUTION: A side of a silicon base board of a flip chip element 4 having a bump on a copper wiring 2 of a print wiring base board 1 is fixed through an electrode and a surface of the copper wiring 2 and a side surface of the silicone base board are coated with a synthetic resin such as a vinyl resin or the like. Said print wiring base board and a solder plate 8 are immersed in an electrolyte in an electrolytic tank 10 and the print base board is used as an anode to carry out electrolytic treatment. In this case, as the electrolyte, an aqueous solution containing tin phenol sulfonate, lead phenol sulfonate and phenol sulfonic acid is used. A dissolving speed of the solder to be removed by corrosion is fast and selective corrosion of Sn and Pb constituting the solder is reduced as well as, by adjusting electrolytic current density, the dissolving speed of the solder can be freely controlled.
      COPYRIGHT: (C)1982,JPO&Japio
    • 目的:通过在所述电解质中含有Sn和Pb的苯酚磺酸盐,使焊料在高速下无腐蚀其合金成分,使焊料作为阳极在电解液中进行电解腐蚀。 构成:在印刷布线基板1的铜布线2上具有突起的倒装芯片元件4的硅基板的一侧通过电极和铜布线2的表面和硅线的侧面固定 基板涂覆有合成树脂如乙烯基树脂等。 将所述印刷布线基板和焊料板8浸渍在电解槽10中的电解质中,并将印刷基板用作阳极进行电解处理。 在这种情况下,作为电解质,使用含有苯酚磺酸锡,苯酚磺酸铅和苯酚磺酸的水溶液。 通过腐蚀除去的焊料的溶解速度快,并且构成焊料的Sn和Pb的选择性腐蚀也降低,并且通过调节电解电流密度,可以自由地控制焊料的溶解速度。