Patent ID: 11946153
Assignee: ISHIHARA CHEMICAL CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A copper or copper alloy electroplating bath comprising two or more electrolytes, wherein the electrolytes include: nitric acid and at least one nitrate salt in combination, wherein the nitrate salt is at least one selected from the group consisting of magnesium nitrate, calcium nitrate, barium nitrate, zinc nitrate, silver nitrate, copper(II) nitrate, nickel nitrate, aluminum nitrate, iron(III) nitrate, and ammonium nitrate, wherein the bath is prepared by a method comprising adding the nitric acid and nitrate salt to the bath in a ratio of the nitric acid to the nitrate salt (nitric acid/nitrate salt (weight ratio)) in a range from 0.5/1 to 10/1, and wherein an addition amount of the nitrate salt in the method is from 128.7 g/L to 177.7 g/L.