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A-series sample after 18 months of exposure: (a) macroscopic image, (b) deposit near the sample suspension hole, (c) largest pitting found on the surface of the sample measuring 615 × 736 µm, (d) pitting with deposit, (e) pitting without deposit. Scale bars: 1 mm (b), 100 μm (c), 10 μm (d), 20 μm (e).
