Study on the no rosin flux applicable to Sn-9Zn/Cu

Based on uniform design method, correlations between five flux components and Sn-9Zn/Cu wetting were studied. Take lauric acid, propylene glycol, decanol, polyethylene glycol 2000 and zinc chloride as independent variables Xi, wetting spreading area as function Y in the experiment. Every variable is divided into fifteen levels. Using computer software UST4.0, the experimental data were gradually statistical regression analyzed and a polynomial equation was obtained. The result of variance analysis showed that the polynomial equation is significant. The results showed: the interaction term of lauric acid X₁ and polyethylene glycol 2000 X₄, or lauric acid X₁ and zinc chloride X₅ was positively related to the wetting spreading area Y; the interaction term of propylene glycol X₂ and zinc chloride X₅ or decanol X₃ and zinc chloride X₅ was positively related to the spreading area Y too. The first order term of propylene glycol X₂, the interaction term of lauric acid X₁ and propylene glycol X₂, quadratic term of decanol X₃, and quadratic term of zinc chloride X₅ was negatively related to the wetting spreading area Y. The results also showed the trend graphs which indicate the influence of five flux components on the wetting spreading area visually.