| 摘要 |
The present invention relates to a brass-plated high carbon steel wire having applied thereto an aqueous zinc phosphate solution having a pH of from about 2 to about 3 and containing (1) a total of from about 28 to 32 grams per liter of phosphoric acid, (2) from about 8 to 11 grams per liter of free phosphoric acid, (3) from about 8 to 12 grams per liter of Zn+2 which may be derived from the group consisting of zinc oxide, zinc phosphate or mixtures thereof, and (4) wherein the mole ratio of total phosphoric acid to free phosphoric acid ranges from 2.5:1 to 04.0:1. In accordance with the present invention, the zinc phosphate coating on the brass-plated steel cord inhibits corrosion and adhesion of the wire to rubber after vulcanization is improved.
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