Conclusions
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1.
Pickling increases the instability of manganin, as a result of hydrogen absorption by metal. This corroborates the “hydrogen” theory on the instability of precision resistance alloys advanced by us.
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2.
The immersion of the alloy in oil contributes to the removal of adsorbed hydrogen and facilitates hydrogen diffusion from the alloy, increasing its stability.
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3.
Intensive agitation of oil at the metal surface by means of ultrasonic vibrations has a considerable stabilizing effect.
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Reference
V. S. Mes'kin and E. A. Al'ftan, Fizika metallov i metallovedeniye, Vol. 10, No. 1, 1960.
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Mes'kin, V.S., Al'ftan, E.A. Methods of stabilizing alloys for precise resistances. Met Sci Heat Treat 3, 366–367 (1961). https://doi.org/10.1007/BF00810409
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DOI: https://doi.org/10.1007/BF00810409