Copper foil for printed circuit board and its surface treatment method
A printed circuit board and surface treatment technology, applied in the secondary treatment of printed circuits, printed circuits, printed circuits, etc., can solve the problem of insufficient adhesion, heat discoloration, poor rust resistance, and insufficient coating thickness. And other issues
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Embodiment (1
[0057] The rough side of the electrolytic copper foil with a thickness of 35 μ is roughened in advance by a well-known method, and the glossy side of the electrolytic copper foil is placed in the electrolyte (A) with a current density of 0.4A / dm 2 , energized for 3 seconds for cathodic electrolysis, washed with water and placed in electrolyte (B), 0.6A / dm 2 , Cathodic electrolysis for 3 seconds, washed with water, and dried.
[0058] Electrolyte (A) Electrolyte (B)
[0059] ZnSO 4 ·7H 2 O 25g / l Na 2 Cr 2 o 7 2H 2 O 5g / l
[0060] CH 3 COONa·3H 2 O 10g / l K 2 HPO 4 10g / l
[0061] Ethylenethiourea 1g / l pH 8.0
[0062] PH 4.0 Temperature 30°C
[0063] Temperature 30°C
[0064] Table 1 shows the measurement results of heat discoloration resistance, solder wettability, and rust resistance of the glossy surface of the copper foil.
[0065] Then, the copper foil was laminated on a substrate impregnated with FR-4 glass and epoxy resin, and press-molded u...
Embodiment (2
[0069] After the rough side of the electrolytic copper foil with a thickness of 35 μ is roughened in advance by a well-known method, the glossy side of the electrolytic copper foil is placed in the electrolyte (A) of the embodiment (1), and the current density is 0.7A / dm 2 1. Cathodic electrolysis in 3 seconds of energization time, and other treatments are exactly the same as in embodiment (1).
[0070] Table 1 shows the results of measuring the glossy surface properties of the copper foil in the same manner as in Example (1).
Embodiment (3
[0072] After the rough side of the electrolytic copper foil with a thickness of 35 μ is roughened in advance by a known method, the glossy side of the electrolytic copper foil is placed in the electrolyte (A) of the embodiment (1), and the current density is 0.4A / dm 2 1. Cathodic electrolysis in 2 seconds of energization time, and other treatments are exactly the same as in embodiment (1).
[0073] Table 1 shows the results of measuring the glossy surface properties of the copper foil in the same manner as in Example (1).
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