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The metastable pitting of Al–5wt%Mg microelectrode (diameter 50μm) after aging at 150°C for 10h has been investigated under a constant potential in deaerated 0.6M NaCl solution (pH 3.5). Current transients (pA size) associated with the dissolution of nanoscale β-phase precipitates have been detected. Taking the cathodic current of H 2 evolution inside the pit into account, the average volume...
Current transient measurements and electrochemical noise (EN) method have been used to characterize the metastable pitting events for Al–Mg–Si microelectrodes (diameter 50μm) in deaerated neutral 0.5M NaCl solution. The results are compared with those obtained by atom force microscopy and scanning electron microscopy. The pit numbers determined by shot noise analysis at open circuit potential and...
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