ゲル粒子を用いた部分置換スズめっき法の開発 [in Japanese] Tin Displacement Plating on Copper Using Alginate Gel Particle [in Japanese]
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Tin displacement plating has been used for improvement of soldering adhesion. Conventional displacement plating methods need a masking process for pattern plating. In the present study, we developed a non masking displacement plating method by using an alginate gel particles. A 10×10<sup>−3</sup> cm<sup>3</sup> sodium alginate solution was dropped into an aqueous solution containing 5 wt% tin sulfate and 0.83 mol dm<sup>−3</sup> thiourea by using a microsyringe. The spherical gel particles were prepared by crosslinking between alginate and Sn<sup>2+</sup>. The average diameter of the gel particles was about 2 mm. A copper sheet was used as a substrate. An alginate gel particle containing electrolytes was attached to the copper surface and left for 30 min at 25°C. A circular tin film formed on the copper substrate with high uniformity and a sharp edge line. The diameter and thickness of the tin film was about 450 μm and 0.4 μm respectively.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 59(6), 415-419, 2008-06-01
The Surface Finishing Society of Japan