Abstract
The corrosion propagation and kinetics of shrinkage defects in ductile iron in NaCl solution were investigated by in-situ observation based on time-lapse microscopy and confocal laser scanning microscopy. Immersion experiments reveal that shrinkage defects endure notably harsher corrosion compared to the matrix, exhibiting an average depth increase of 52.38μm within a single day. The depth loss rate, a crucial indicator for corrosion kinetics, inversely correlates with the square root of immersion time, underscoring the substantial role of shrinkage defects in expediting early-stage corrosion. The corrosion process predominantly involves longitudinal extension, with sharply shaped defects experiencing the most significant depth increases.
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