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Continuous modification of AK11 silumin with multicomponent salt on base of NaCl

Pezda J.

Archives of Foundry Engineering

2007

Vol. 7, iss. 4

151-154

Sodium belongs to the most effective modifying agents. The sodium can be brought into metal bath in metallic form or in form of chemical compounds comprising sodium, the most often in form of NaF. In the both above mentioned cases action of sodium is of very short duration, (what constitutes its main disadvantage), as lasting for about 15-20 minutes, mainly due to its evaporation from metal bath. Prolongation of modifying agent's action can be accomplished due to technology of continuous introduction of sodium to metal bath. That technology is based on continuous electrolysis of sodium salt, occurring directly in melting pot with liquid alloy. Application of solid electrolyte - conducting sodium ions (ionic conductance) - and simultaneously maintaining solid state of aggregation in melting and superheating temperature of alloy, i.e. 600÷800°C is indispensable for such process. Suitable sodium salt which is placed in retort produced from solid electrolyte shall undergo dissociation, and next electrolysis, in result of applied direct current. Sodium ions arisen during the dissociation of sodium salts and electrolysis are "conveyed" through retort walls made from solid electrolyte. In contact with liquid alloy as cathode, sodium ions pass to atomic state, modifying the alloy. The paper discusses results of initial study concerning process of continuous modification of AK11 silumin with use of multicomponent sodium salt on base of NaCl, shows results of tensile strength Rm and measurement of voltage drop for the alloy in solid state. Values of those parameters have confirmed obtained modification effect of investigated alloys. Assurance of stable run of continuous modification process brings about necessity of a further research aimed at optimization of parameters of the process.