| 摘要 |
PURPOSE:To improve corrosion resistance by incorporating specific weight % of dimethylformamide and viscosity imparting agent such as high molecular polysaccharide into a water soluble zinc chloride flux. CONSTITUTION:3-10% Dimethylformamide and 0.8-4% viscosity imparting agent consisting of high molecular polysaccharide such as D-mannite are incorporated into the water soluble zinc chloride flux. The corrosion resistance of the soft solder is largely improved by the dimethylformamide incorporated therein without deteriorating the joining characteristic of said metal and the deterioration of said metal with elapse of time owing to corrosion is decreased. The high molecular polysaccharide is required to be incorporated therein at 0.8% as a lower limit in order to render the necessary viscosity to the soft solder. The joining characteristic in the case of using the conventional inorg. flux is assured and the corrosion resistance is improved by the above-mentioned method. |
