On the Effects of Atmospheric Particles Contamination and Humidity on Tin Corrosion

L. D’Angelo, V. Verdingovas, L. Ferrero, E. Bolzacchini, R. Ambat

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Abstract

The effects of hygroscopic atmospheric particles are investigated in relation to the corrosion of tin. Surface insulation resistance test boards were directly contaminated both with ambient particles sampled in the field at Milan, Italy, and with pure saline particles generated in the laboratory. An innovative particle deposition device was used to uniformly coat circular spots on to the test board surfaces. Deliquescence and crystallization of the water-soluble compounds were detected by observing the impedance response to varying relative humidity (RH) conditions with a gradual and continuous ramps. The effects of the adsorption/desorption kinetics and of the temperature on the deliquescence and crystallization RH values were also investigated. Leakage current measurements at 5-V dc highlighted the ability of atmospheric particles to promote corrosion and electrochemical migration at RH levels far below condensing conditions (100% RH).
Original languageEnglish
JournalIEEE Transactions on Device and Materials Reliability
Volume17
Issue number4
Pages (from-to)746-757
ISSN1530-4388
DOIs
Publication statusPublished - 2017

Keywords

  • Atmospheric measurements
  • Corrosion
  • Atmospheric corrosion
  • Crystallization
  • Deliquescence
  • Leakage current
  • Surface insulation resistance

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