Microstructures of high copper amalgams after corrosion in various solutions

J. H. Chern Lin, S. J. Marshall, G. W. Marshall

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Five copper rich amalgam systems were studied to detect corrosion induced microstructural changes after immersion in various solutions for 2.5 years. The solutions were artificial saliva, 10 times concentrated artificial saliva, and a one to one ratio of 1% Na2S and Ringer's solution. Surface corrosion products were removed by metallographic polishing and microstructures were studied by SEM/EDS and x-ray diffraction. Preferential corrosion attack occurred in the eta prime Cu6Sn5 reaction product in both blended and single particle systems. Copper appeared to be preferentially released, resulting in insoluble tin containing corrosion products. In addition, phase mixtures of copper and tin containing products were often found in the corroded samples. In more concentrated solutions the extent of corrosion was more pronounced. The corrosion process also enhanced the gamma 1 to beta 1 transformation.

Original languageEnglish
Pages (from-to)176-181
Number of pages6
JournalDental Materials
Volume3
Issue number4
DOIs
Publication statusPublished - 1987 Aug

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Dentistry(all)
  • Mechanics of Materials

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