Characterization of Chromate Conversion Coating Formation and Breakdown Using Electrode Arrays | Zendy

W. Zhang | Zendy; Belinda Hurley | Zendy; R. G. Buchheit | Zendy

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Characterization of Chromate Conversion Coating Formation and Breakdown Using Electrode Arrays

Author(s) -

W. Zhang,

Belinda Hurley,

R. G. Buchheit

Publication year - 2002

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/1.1485774

Subject(s) - coating , chromate conversion coating , anode , corrosion , electrode , polarization (electrochemistry) , cathodic protection , materials science , electrochemistry , cathode , analytical chemistry (journal) , metallurgy , chemical engineering , composite material , chemistry , chromatography , engineering

concentrations in the coating continued to increase during this electrochemically quiescent period, suggesting continued CCC evolution. Conversion-coated arrays were subject to anodic potentiodynamic polarization in 0.5 M NaCl until all elements on the array exhibited coating breakdown and substrate pitting. Breakdown potentials were found to increase with coating time up to 120 s, indicating anodic inhibition in CCC corrosion protection. Breakdown was found to be more difficult on electrodes that were net cathodes during coating formation. Results also showed that the NaF and K3Fe~CN!6 in commercial CCC bath formulations strongly contributed to coating corrosion resistance. Without Fv, the Al surface passivated quickly during coating formation, and a nonprotective film formed. Without Fe~CN!3 62 , CCCs exhibited lower breakdown potentials.

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