Failure analysis of printed circuit boards in the main telephone system of marine product factory

Masamitsu Watanabe, Masaaki Takaya, Morihiko Matsumoto, Jun'ichi Sakai

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    Abstract

    The failure of the main telephone system in a marine product factory due to copper sulfide (Cu2S) creep was analyzed by the measurement of hydrogen sulfide (H2S) in the atmosphere, elemental analysis with energy dispersive X-ray spectroscopy, and cross-sectional observation of vias in the printed circuit boards. Indoor H2S concentrations were higher than outdoor ones and these corresponded to the G2 and/or G3 levels defined in ISA S71.04-1985. The chemical composition of the copper sulfide creep indicates that it consisted of copper, oxygen, and sulfur. Cross-sectional observation and elemental mapping analysis showed that Cu2S creep initiated not at the edge of the organic coating (organic solder preservative, OSP) inside the vias but mainly at defects in the organic coating covering the copper.

    Original languageEnglish
    JournalEngineering Failure Analysis
    DOIs
    Publication statusAccepted/In press - 2015 Jul 27

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    Keywords

    • Copper
    • Hydrogen sulfide
    • Printed circuit board
    • Sulfide creep
    • Via

    ASJC Scopus subject areas

    • Materials Science(all)
    • Engineering(all)

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