首页|Dynamic structures and electrochemical behavior during the formation of trivalent chromium-based conversion coating on Zn

Dynamic structures and electrochemical behavior during the formation of trivalent chromium-based conversion coating on Zn

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  • NSTL
  • Elsevier
The growth processes of trivalent chromium-based conversion (TCC) coatings on galvanized steel at room temperature (298.15 K) were studied using the potential-time curve, polarization curves, electrochemical impedance spectroscopy and scanning electron microscopy. Results display the integrity of bi-layers at stage II around 50 s causes enhanced corrosion resistance and film compactness. The protection of surficial film, dominated by inner Cr(III)-rich barrier layer, is weakened after stage III, where it presents defective bi-layers with the mixed kinetic-diffusion control. Thermodynamic stability, layer growth and structural evolution of the film formation above Zn are discussed by the Pourbaix diagrams, molecular dynamics and schematic models, respectively.

Trivalent chromiumConversion coatingElectrochemical corrosionMicrostructure stabilityOxide formationCORROSION-RESISTANCEIMMERSION TIMEMOLECULAR-DYNAMICSSTAINLESS-STEELFORCE-FIELDCHROMATE COATINGSALUMINUM-ALLOYSOXIDE-FILMSZINCTEMPERATURE

Liu, Xiahe、Wang, Laibin、Wang, Mei、Li, Fenghua、Gao, Junjie、Li, Jiawei

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Northeastern Univ

Chinese Acad Sci

2022

10.1016/j.surfcoat.2021.128041

Surface & Coatings Technology

Surface & Coatings Technology

ISTP
ISSN：0257-8972
年,卷(期)：2022.431
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