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Hexacyanoferrate‐Intercalated Layered Double Hydroxides as Nanoadditives for the Detection of Early‐Stage Corrosion of Steel: The Revival of Prussian blue
Author(s) -
Wilhelm Ma,
Quevedo Marcela C.,
Sushkova Alesia,
Galvão Tiago L. P.,
Bastos Alexandre,
Ferreira Mário,
Tedim João
Publication year - 2020
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202000144
Subject(s) - prussian blue , layered double hydroxides , chemistry , corrosion , intercalation (chemistry) , dielectric spectroscopy , scanning electron microscope , inorganic chemistry , polarization (electrochemistry) , fourier transform infrared spectroscopy , electrochemistry , nuclear chemistry , chemical engineering , materials science , hydroxide , electrode , composite material , organic chemistry , engineering
This work describes the synthesis and characterization of Zn‐Al and Mg‐Al layered double hydroxides (LDHs) intercalated with hexacyanoferrate. X‐ray diffraction, infrared spectroscopy and scanning electron microscopy indicated a successful intercalation of hexacyanoferrate in the sub‐micrometer sized platelet‐like particles. Release studies of hexacyanoferrate from LDHs found that the anion is released depending on the concentration of NaCl and under alkaline conditions. When placed in contact with carbon steel under corrosive conditions, the formation of Prussian blue was detected. Furthermore, the application of potentiodynamic polarization and electrochemical impedance spectroscopy revealed that hexacyanoferrate has a detrimental effect on the corrosion of carbon steel, while when intercalated in LDHs this effect is minimized. Overall, these findings open perspectives for the application of these materials as smart nanoadditives in coatings for corrosion detection.