Abstract
In this paper the allotropic transition of β to α-Sn (so called tin pest) was characterized by electrical resistance measurements. The aim was to compare the ability and sensitivity of the usually applied optical observations by the electrical measurements. Samples were prepared from 99Sn1Cu alloy. The samples were inoculated by InSb and were stored at −18°C for 40 days. The transition was checked by optical microscopy on the surface of the samples and electrical resistance of the samples was measured by a microhmmeter. Cross-sections were also prepared to compare the resistance change with the amount of transformed tin in the samples. It was found that the electrical resistance measurement is a much more sensitive characterization method of tin pest growth than any kind of optical observation. It was also observed that in the case of InSb inoculator the nature of the process differs from the results of α-Sn inoculator.
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