本发明涉及一种表层镀锡药芯银钎料的制备方法，包括以下步骤：一、将银基钎料丝轧制成钎料带，接着将钎料带的内表面进行粗糙化处理或压花处理，然后将钎料带进行退火处理；二、将水溶性氯化亚锡或硫酸亚锡、柠檬酸钠和硫脲分别加入水，加热搅拌溶解，然后按一定比例混合并搅拌均匀，最后加入氯化钛水溶液，并用氨水调节PH值为8‑10，制备得到化学镀锡溶液；三、将烘干后的钎料带利用化学镀锡溶液进行镀锡处理，然后将镀锡后的钎料带旋转卷制成搭接缝呈螺旋状的管状结构，并在卷制过程中将银钎剂加入管内形成药芯，最后通过轧制或拉拔制造成药芯银钎料。本发明制得药芯银钎料的钎剂均匀性好，生产效率高，生产成本低且不易漏粉，焊接时工艺性好。

The present invention relates to a method for preparing tin-plated silver cored silver solder on the surface, including the following steps: 1. Rolling silver-based solder wire into solder ribbon, and then roughening or pressing the inner surface of the solder ribbon Flower treatment, and then annealing the solder tape; 2. Add water-soluble stannous chloride or stannous sulfate, sodium citrate and thiourea to water, heat and stir to dissolve, then mix and stir evenly according to a certain proportion, and finally Add the titanium chloride aqueous solution, and adjust the pH value with ammonia water to 8-10 to prepare the electroless tin plating solution; 3. Use the electroless tin plating solution for the tin-plated solder strip after drying, and then the tin-plated solder The material strip is rotated and wound into a spiral tubular structure with lap joints, and the silver flux is added into the tube to form a core during the rolling process, and finally the core silver brazing material is manufactured by rolling or drawing. The flux-cored silver solder prepared by the invention has good uniformity, high production efficiency, low production cost, low powder leakage, and good manufacturability during welding.