Hexacyanoferrate‐Intercalated Layered Double Hydroxides as Nanoadditives for the Detection of Early‐Stage Corrosion of Steel: The Revival of Prussian blue. Issue 21 (20th May 2020)

• Record Type: Journal Article
• Authors: Wilhelm, Manon; Quevedo, Marcela C.; Sushkova, Alesia; Galvão, Tiago L. P.; Bastos, Alexandre; Ferreira, Mário; Tedim, João
• Is Part Of: European journal of inorganic chemistry. Issue 21(2020)
• Page Start: 2063
• Page End: 2073
• Publication Date: 2020-05-20
• Subjects: Controlled release -- Corrosion -- Intercalations -- Layered double hydroxides -- Sensors; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.202000144
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : 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. Abstract : Hexacyanoferrate ions intercalated in layered double hydroxides are released under controlled conditions and allow detection of corrosion onset in carbon steel by the formation of Prussian blue. The intercalation of hexacyanoferrate in LDHs limits the detrimental corrosion acceleration effect associated with hexacyanoferrate, when available in solution.