In situ pH responsive fluorescent probing of localized iron corrosion |
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Affiliation: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, PR China;2. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, PR China;3. Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, PR China |
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Abstract: | A fast and versatile method has been demonstrated to detect the early stage of iron corrosion in situ, with minimum external perturbation, by using a pH sensitive fluorescence dye. The decreasing fluorescence intensity inside corrosion pits induced by hydrogen ions produced during iron corrosion is used as a signal indicator. Identification of corrosion pits (with resolution of <1 μm) and quantification of corrosion rate based on local hydrogen concentration were achieved. The developed technique has been applied to show that surface roughness, under a constant current condition, influences the corrosion of iron. Corrosion occurs preferentially adjacent to local topographic features. |
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Keywords: | A Iron C Interfaces C Pitting corrosion |
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