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Size-dependent electrochemical role of the S phase at the initial corrosion stage of 2024Al alloy has been elucidated by transmission electron microscopy technique. A critical size of about 10nm is identified below which S phases are out of electrochemical function at the initial corrosion stage, when Al20Cu2Mn3 dispersoids play a crucial role. The electrochemical function of S phases becomes remarkable...
The pit initiation and growth processes occurring in austenitic stainless steel are included in the passive region of polarization curve. However, polarization measurements do not yield surface morphological insights, which limit the ability to provide a comprehensive picture of the corrosion process. A quasi-in-situ ex-polarized TEM observation method is designed to elucidate the microstructural...
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