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<p>Streaking corrosion (SC) of AA7075-T6, characterized by the rapid dissolution of an altered surface layer (ASL) formed through mechanical surface treatments, is investigated. Utilizing in situ high-resolution reflected light microscopy, we reveal that SC initiates preferentially on intermetallic particles (IMP) or pre-existing pits. Optical evidence of galvanic interactions between propagating streaks and connected IMPs is observed. Concurrent in situ open circuit potential (OCP) measurements show a characteristic pattern that correlate with SC initiation, progression, and termination. This work demonstrates the effectiveness of a simple in situ optical-electrochemical setup in tracking dynamic local corrosion processes and directly linking OCP transients to specific corrosion events.</p>

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Intermetallic particles trigger streaking corrosion in AA7075-T6

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月25日

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  • Marlon Mopon Jr.,
  • Arjan Mol,
  • Santiago J. Garcia

摘要

Streaking corrosion (SC) of AA7075-T6, characterized by the rapid dissolution of an altered surface layer (ASL) formed through mechanical surface treatments, is investigated. Utilizing in situ high-resolution reflected light microscopy, we reveal that SC initiates preferentially on intermetallic particles (IMP) or pre-existing pits. Optical evidence of galvanic interactions between propagating streaks and connected IMPs is observed. Concurrent in situ open circuit potential (OCP) measurements show a characteristic pattern that correlate with SC initiation, progression, and termination. This work demonstrates the effectiveness of a simple in situ optical-electrochemical setup in tracking dynamic local corrosion processes and directly linking OCP transients to specific corrosion events.