| 摘要 |
An electroless gold plating bath includes a water-soluble gold compound, a completing agent, an aldehyde compound, and an amine compound represented by R<SUB>1</SUB>-NH-C<SUB>2</SUB>H<SUB>4</SUB>-NH-R<SUB>2 </SUB>or (CH<SUB>2</SUB>-NH-C<SUB>2</SUB>H<SUB>4</SUB>-NH-CH<SUB>2</SUB>)<SUB>n</SUB>-R<SUB>4 </SUB>(wherein R<SUB>1 </SUB>to R<SUB>4 </SUB>represent -OH, -CH<SUB>3</SUB>, -CH<SUB>2</SUB>OH, -C<SUB>2</SUB>H<SUB>4</SUB>OH, -CH<SUB>2</SUB>N(CH<SUB>3</SUB>)<SUB>2</SUB>, -CH<SUB>2</SUB>NH(CH<SUB>2</SUB>OH), CH<SUB>2</SUB>NH(C<SUB>2</SUB>H<SUB>4</SUB>OH), -C<SUB>2</SUB>H<SUB>4</SUB>NH(CH<SUB>2</SUB>OH), -C<SUB>2</SUB>H<SUB>4</SUB>NH(C<SUB>2</SUB>H<SUB>4</SUB>OH), -CH<SUB>2</SUB>N(CH<SUB>2</SUB>OH)<SUB>2</SUB>, -CH<SUB>2</SUB>N(C<SUB>2</SUB>H<SUB>4</SUB>OH)<SUB>2</SUB>, -C<SUB>2</SUB>H<SUB>4</SUB>N(CH<SUB>2</SUB>OH)<SUB>2 </SUB>or -C<SUB>2</SUB>H<SUB>4</SUB>N(C<SUB>2</SUB>H<SUB>4</SUB>OH)<SUB>2</SUB>, and n is an integer of 1 to 4). The electroless gold plating can be carried out without corrosion of an underlying metal to be plated at a stable deposition rate. Because of the high deposition rate and the immersion and reduction types, thickening of a plated coating is possible in one solution and the color of the coating is not degraded to provide a good appearance while keeping a lemon yellow color inherent to gold.
|
