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Method for visualizing under-coating corrosion utilizing pH indicators before visible damage

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Fig. 4 serves as a proof of concept where a metal sample (cleaned by mechanical abrasion grit size P120) is exposed to the procedure in the presence of phenolphthalein in brine adjusted to pH = 9 with NaOH (see S1 for time lapse animation)
Fig. 4. Background subtracted images (bottom), unsubtracted images (top). Green color indicates regions of low pH while red indicates an increase in pH
Fig. 7. The image of the monitored region, marked by the blue square (left). The normalized green intensity in the region as a function of time (right)
Fig. 9. Posterized images of the white plate with phenolphthalein indicator. The red square and the curve shows the visibly corroding region and its green intensity as a function of time while the black square and the curve shows a region without visible c

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