Premium
Amino Acid Interleaved Layered Double Hydroxides as Promising Hybrid Materials for AA2024 Corrosion Inhibition
Author(s) -
Stimpfling Thomas,
Vialat Pierre,
HintzeBruening Horst,
Keil Patrick,
Shkirskiy Viacheslav,
Volovitch Polina,
Ogle Kevin,
Leroux Fabrice
Publication year - 2016
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.201501161
Subject(s) - chemistry , corrosion , layered double hydroxides , hydroxide , nuclear chemistry , chromate conversion coating , inorganic chemistry , organic chemistry
Various α‐amino acid (αAA) molecules were screened for their ability to retard the corrosion of AA2024 aluminum alloy substrate. The αAAs screened were L ‐arginine ( L ‐Arg), L ‐asparagine ( L ‐Asn), L ‐cysteine ( L ‐Cys), L ‐cystine, L ‐histidine ( L ‐His), L ‐methionine ( L ‐Met), L ‐phenylalanine ( L ‐Phe), L ‐serine ( L ‐ser), L ‐tryptophan ( L ‐Trp), and L ‐tyrosine ( L ‐Tyr). From their performances compared with that of the reference additives chromate and 2‐mercaptobenzothiazolate (MBT), L ‐Cys and L ‐Phe were selected, and their layered double hydroxide (LDH) interleaved derivatives were further scrutinized. Different LDH phases, namely, LiAl 2 , Mg 2 Al, MgZnAl, and Zn 2 Al, were tested as hosts for the inhibitor αAA substances, and the materials were characterized by XRD, FTIR spectroscopy, and SEM. The efficiencies and durable performances of the hybrid materials as an anticorrosion agents for aluminum alloy 2024 (AA2024) were demonstrated through direct current (DC) polarization measurements, and the evolution of the polarization resistance was recorded. The mechanism of inhibition focused on the most promising hybrid material LDH/ L ‐Cys and was tentatively explained as anion exchange and dissolution of the inorganic framework at the cathodic and anodic corrosion zones, respectively, with the particular occurrence of Cu‐rich intermetallic zones. The obtained results evidence that the LDH/ L ‐CYS assembly embedded in the polymer coating retards the corrosion process of the AA2024 substrate after a prolonged immersion time.