ろう付用フラックスの電導度測定結果からみたフラックス作用について(第 2 報)

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The phase diagram and specific electrical conductivity of fused salt systems ZnCl_2-SnCl_2,ZnCl_2-NH_4 Cl and ZnCl_2-SnCl_2・2H_2O, which are used generally as flux in soldering, were measured to clear a relation between the structures of these mixed salts and the spread area of Pb-Sn eutectic solder on copper base plate. The results obtained were as follows : 1) The diagram of ZnCl_2-SnCl_2 system is a simple eutectic with no solid solution, and ZnCl_2-NH_4Cl system forms a intermediate compound formation with two simple eutectics. It seems the diagram of ZnCl_2-SnCl_2・2H_2O system is a intermediate compound formation type. 2) The dissociation of ZnCl_2-SnCl_2 system was presumed as follows from the basis of J.D. Mackenzie theory on single zinc-chloride; 3ZnCl_2⟶ZnCl_6^<4->+2Zn, ^<2+>, SnCl_2⟶Sn_2^<2+>+2Cl^- 3) Isotherms of specific conductivity of ZnCl_2-SnCl_2 system deviate negatively from additivity when plotted against composition, and three partial negative deviations were found near the compositions of two eutectics and a intermediate compound in ZnCl_2-NH_4Cl system at just above liquidus temperature for each. 4) The transition temperature obtained from temperature dependence of activation energy for electrical conductivity of ZnCl_2-SnCl_2 or ZnCl_2-NH_4Cl systems coincided with the temperature required for good spreading of the solder on copper plate, using these systems as flux. This result showed that an effective action temperature range of flux is from the liquidus to the transition temperature of itself and, therefore, a recommendable soldering temperature is limitted by these temperatures of flux to be used generally. 5) Th flux action of ZnCl_2-SnCl_2・S2H_2O system could be explained as follows; SnC-l_2・2H_2O⟶SnCl_2+2H_2O ZnCl_2+H_2O⟶Zn(OH)Cl+HCl CuO+2HCl⟶CuCl_2+H_2O Although two equations of the latter were presented by H. H. Manko, the H_2O produced by the dissociation of SnCl_2・2H_2O during heating reacts with ZnCl_2 and forms HCl. The HCl and SnCl_2 act as flux in soldering of the range 180-350℃, and no SnCl_2・2H_2O acts as flux in the form of itself.
社団法人溶接学会の論文
1975-02-05

ろう付用フラックスの電導度測定結果からみたフラックス作用について(第 2 報)

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