US 11,898,253 B2
Process for producing tinned copper wires
Mingmao Li, Jiangxi Province (CN); Shijun Tang, Jiangxi Province (CN); Shihong Tang, Jiangxi Province (CN); Mingbiao Zhu, Jiangxi Province (CN); and Wenjing Wang, Jiangxi Province (CN)
Assigned to JIANGXI ADVANCED COPPER INDUSTRY RESEARCH INSTITUTE
Filed by Jiangxi Advanced Copper Industry Research Inst, Jiangxi Province (CN)
Filed on Mar. 30, 2021, as Appl. No. 17/301,240.
Claims priority of application No. 202010255916.7 (CN), filed on Apr. 2, 2020.
Prior Publication US 2021/0310111 A1, Oct. 7, 2021
Int. Cl. C23C 4/08 (2016.01); C23C 4/123 (2016.01); B23K 35/02 (2006.01); B23K 35/30 (2006.01); B23K 35/362 (2006.01); C23C 4/16 (2016.01); C23C 4/18 (2006.01); B23K 101/32 (2006.01); B23K 103/12 (2006.01); B23K 101/34 (2006.01)
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
OG exemplary drawing
 
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 %.