Patent ID: 9339883
Filing Date: 2016-05-17
CPC Classification: B23K

Claim Text:
1. A soldering method, comprising: 1) forming a molten solder in a solder bath; 2) forming a dynamic flow of the molten solder from the solder bath; and 3) contacting an object to be soldered with the dynamic flow of the molten solder; wherein: a surface of the molten solder comprises a reduction layer; an oxygen content of the molten solder is below 10 ppm; the reduction layer comprises a nonionic surfactant, an antioxidant, and ammonium metaphosphate; the nonionic surfactant is selected from nonylphenol ethoxylates, polyoxyethylene sorbitan monolaurates, or a mixture thereof; the antioxidant is selected from phytic acid, malic acid, citric acid, or a mixture thereof; and the reduction layer comprises between 59 and 80 wt. % of the nonionic surfactant, between 15 and 40 wt. % of the antioxidant, and between 0.5 and 5 wt. % of ammonium metaphosphate.