CPC C23C 4/08 (2013.01) [B23K 35/0227 (2013.01); B23K 35/302 (2013.01); B23K 35/362 (2013.01); C23C 4/123 (2016.01); C23C 4/16 (2013.01); C23C 4/18 (2013.01); B23K 2101/32 (2018.08); B23K 2101/34 (2018.08); B23K 2103/12 (2018.08)] | 6 Claims |
1. A process for producing a tinned copper wire, comprising:
subjecting a copper wire sequentially to activation treatment, a first hot tinning treatment, a first cooling, a second hot tinning treatment, and a second cooling to obtain a tinned copper wire,
wherein:
the first hot tinning treatment is carried out in a first molten tin liquid at a first temperature;
the second hot tinning treatment is carried out in a second molten tin liquid at a second temperature;
the first temperature is higher than the second temperature;
the first temperature is at least 38° C. higher than the melting point of tin; and
the second temperature is at least 8° C. higher than the melting point of tin;
wherein the first temperature is 320° C., and wherein the second temperature is 245° C.;
the second molten tin liquid for the second hot tinning treatment comprises a rare metal in an amount of 0.08 wt %, and the rare metal is composed of indium, bismuth and nickel at a mass ratio of 1:1:1;
the first hot tinning treatment is carried out with the first molten tin liquid comprising copper contamination from the copper wire in an amount of zero wt % to 2.0 wt %, and wherein the second hot tinning treatment is carried out with the second molten tin liquid comprising copper contamination from the copper wire in an amount of zero wt % to 0.7 wt %
the first molten tin liquid for the first hot tinning treatment comprises phosphorus in an amount of 0.1 wt %.
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