2022
DOI: 10.3389/fmats.2022.877728
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Effect of a Fast Potential Change on the Early Stage of Zinc Passivation in a Saturated Calcium Hydroxide Solution

Abstract: The fast and sharp corrosion potential change from the active state to the passive state, that pure zinc plates immersed in calcium hydroxide saturated solutions with and without chlorides spontaneously exhibit at the early stage of passivation, was studied. The corrosion behavior was investigated by corrosion potential monitoring, anodic polarization curves and electrochemical impedance spectroscopy. The zinc surface was characterized by scanning electron microscopy and X-ray energy dispersive spectroscopy. E… Show more

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“…In the case that chloride anions are present in the simulated concrete pore solution (or in the real concrete), the formation of a passive layer of corrosion products from Ca[Zn(OH) 3 ] 2 •2H 2 O may be slowed down [198]; however, according to another source, chloride anions may accelerate the passivation process, but with the formation of a less protective (porous) passive layer of calcium hydroxyzincate [199]. According to other authors, chloride anions may cause passivation due to the formation of corrosion products based on ZnCl 2 •4Zn(OH) 2 [186], or Zn 5 (OH) 8 Cl 2 •H 2 O (simonkolleite), which has a significant volume compared to other zinc corrosion products and therefore may disturb the concrete cover [200,201].…”
Section: Corrosion Performancementioning
confidence: 99%
“…In the case that chloride anions are present in the simulated concrete pore solution (or in the real concrete), the formation of a passive layer of corrosion products from Ca[Zn(OH) 3 ] 2 •2H 2 O may be slowed down [198]; however, according to another source, chloride anions may accelerate the passivation process, but with the formation of a less protective (porous) passive layer of calcium hydroxyzincate [199]. According to other authors, chloride anions may cause passivation due to the formation of corrosion products based on ZnCl 2 •4Zn(OH) 2 [186], or Zn 5 (OH) 8 Cl 2 •H 2 O (simonkolleite), which has a significant volume compared to other zinc corrosion products and therefore may disturb the concrete cover [200,201].…”
Section: Corrosion Performancementioning
confidence: 99%