Chemical palladium plating solution
An electroless plating, palladium salt technology, applied in liquid electroless plating, metal material coating process, coating, etc., can solve the problem of difficult to control thickness and other problems, and achieve the advantages of shortened life, excellent solder bonding, and reduced production cost. Effect
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Embodiment 1
[0040] Bath composition
[0041] PdCl 2 Mass concentration / g·L -1 2
[0042] Ethylenediamine volume concentration / mL·L -1 50
[0043] Citric acid / g·L -1 20
[0044] NaH 2 PO 2 ·H 2 O mass concentration / g·L -1 12
[0045] Thiourea / mg / L 25
[0046] The pH of the plating solution was adjusted to 9.78 with hydrochloric acid, and a 20×30mm nickel-plated printed circuit board was immersed in the plating solution for 30 minutes, and the temperature of the plating solution was 50°C. As a result, a smooth palladium film having an average thickness of 0.65 µm was produced. The palladium film was observed under a 640-fold optical microscope, and no cracks were observed. At the same time, when the plating solution was cooled, the measured pH was 9.58, with little change in pH. The MTO of palladium is greater than 3.
Embodiment 2
[0048] Bath composition
[0049] PdCl 2 Mass concentration / g·L -1 0.2
[0050] Ethylenediamine volume concentration / mL·L -1 5
[0051] Mass concentration of isopropanolamine / g·L -1 2
[0052] NaH 2 PO 2 ·H 2 O mass concentration / g·L -1 2
[0053] Thiourea / mg / L 15
[0054] The pH of the plating solution was adjusted to 9.8 with hydrochloric acid, and the 20×30mm pre-nickeled printed circuit board was immersed in the plating solution for 30 minutes, and the temperature of the plating solution was 50°C. As a result, a smooth palladium film having an average thickness of 0.15 µm was produced. The palladium film was observed under a 640-fold optical microscope, and no cracks were observed. At the same time, when the plating solution was cooled, the measured pH was 9.66, with little change in pH. The MTO of palladium is greater than 4.
Embodiment 3
[0056] Bath composition
[0057] PdCl 2 Mass concentration / g·L -1 0.6
[0058] Ethylenediamine volume concentration / mL·L -1 15
[0059] Triethanolamine / g·L -1 20
[0060] NaH 2 PO 2 ·H 2 O mass concentration / g·L -1 4
[0061] Bismuth nitrate / mg / L 20
[0062] The pH of the plating solution was adjusted to 9.88 with hydrochloric acid, and a 20×30mm nickel-plated printed circuit board was immersed in the plating solution for 30 minutes, and the temperature of the plating solution was 50°C. As a result, a smooth palladium film with an average thickness of 0.45 µm was produced. The palladium film was observed under a 640-fold optical microscope, and no cracks were observed. At the same time, when the plating solution was cooled, the measured pH was 9.53, with little change in pH. The MTO of palladium is greater than 6.
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