Solder flux composition
AssigneeInternational Standard Electric Corporation
InventorDaniel F. T. Roberts
Life of this patent
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Abstract
A solder flux composition comprises a mixture of sarcosine and tartronic or tartaric acid dissolved in water and an aliphatic alcohol. Typically the acid-sarcosine weight ratio lies within the range 90:10 to 30:70 and the solution may contain between 5 and 20 weight percent of solids. The flux is employed for tin/lead soldering of a range of metals and alloys including copper, nickel and nickel-iron. Bidegradation of the flux is inhibited by the inclusion of lead carbonate, phenol or salicylic acid in the composition.
Claims14
A solder flux composition, including an amount of tartronic acid or tartaric acid and an amount of sarcosine dissolved in a solvent comprising water or a miscible mixture of water and one or more aliphatic alcohols, wherein the weight ratio of said amount of acid to said amount of sarcosine is from 90:10 to 30:70 and said amount of sarcosine is sufficient to suppress the de-wetting effects of the decomposition products of said acid produced by heating said flux to soldering temperatures.
Dependencies are inferred from the claim text.