Aqueous passivating agent list their use for improving the performance of the antioxidant and corrosion of the plating layer PCB

摘要

The present invention relates to aqueous passivating agent for improving the performance of the antioxidant-corrosion of the plating layer of the PCB. The above aqueous phase passivating agent, 4-12 parts by weight of a corrosion inhibitor, a composite surfactant system of 15-25 parts by weight, 10-20 parts by weight of ion chelating agents, pH adjustment of 6-15 parts by weight agent, 20-40 parts by weight of a builder agent, constituted by the rest of pure water. Is treated passivated the PCB using aqueous passivating agent. The first diluted with deionized water, the dilution ratio is 10 to 100, preferably 100 / 8-100 / 3 times. The pH at 7 to 11, preferably 7.5 to 9.5. A surface tension of 18 ~ 28dyn / cm. In passivation treatment, using the impregnation process, more preferably, in addition to ultrasonic waves of an auxiliary cleaning processes passivation. At a temperature of passivating process is 20 ~ 60 ℃, the processing time is 60 to 150 seconds. After the PCB is treated by aqueous passivating agent of the present invention, the neutral salt spray test, nitric acid vapor test, the mixed gas test, sulfur dioxide tests, comprehensively tested by bonding tensile test, the results plated layer Performance of antioxidant-corrosion can be significantly improved in.