TY - JOUR
T1 - Properties of hybrid sol-gel coatings with the incorporation of lanthanum 4-hydroxy cinnamate as corrosion inhibitor on carbon steel with different surface finishes
AU - Suárez-Vega, Ana
AU - Agustín-Sáenz, Cecilia
AU - O'Dell, Luke A.
AU - Brusciotti, Fabiola
AU - Somers, Anthony
AU - Forsyth, Maria
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/9/30
Y1 - 2021/9/30
N2 - In recent years, sol-gel chemistry has been of increasing interest for the development of hybrid organic-inorganic coatings as conversion coating replacements for carbon steel. They provide passive corrosion protection through the creation of a highly adhered coating with a barrier effect to the ionic movement, however, they do not offer active corrosion protection. Lanthanum 4-hydroxy cinnamate [La(4-OHCin)3] has been extensively studied and has demonstrated corrosion inhibition for carbon steel substrates. In this work, different concentrations of La(4-OHCin)3 have been directly incorporated into two sol-gel formulations with the aim of improving the overall corrosion protection provided by the hybrid coatings. The effect of La(4-OHCin)3 on the structure of the coating has been studied by 29Si MAS NMR. The effect on the corrosion protection of coatings deposited on carbon steel with different surface finishes has been examined by EIS and the surface analysis of these coatings has been characterised with techniques such as SEM-EDX and ATR/FT-IR. The better anticorrosion performance of the coatings containing La(4-OHCin)3 has been demonstrated independently of the surface finish. Also, optimum coating and inhibitor concentrations have been found and a correlation between the structural and morphological properties of the coatings and their anticorrosion performance has been identified.
AB - In recent years, sol-gel chemistry has been of increasing interest for the development of hybrid organic-inorganic coatings as conversion coating replacements for carbon steel. They provide passive corrosion protection through the creation of a highly adhered coating with a barrier effect to the ionic movement, however, they do not offer active corrosion protection. Lanthanum 4-hydroxy cinnamate [La(4-OHCin)3] has been extensively studied and has demonstrated corrosion inhibition for carbon steel substrates. In this work, different concentrations of La(4-OHCin)3 have been directly incorporated into two sol-gel formulations with the aim of improving the overall corrosion protection provided by the hybrid coatings. The effect of La(4-OHCin)3 on the structure of the coating has been studied by 29Si MAS NMR. The effect on the corrosion protection of coatings deposited on carbon steel with different surface finishes has been examined by EIS and the surface analysis of these coatings has been characterised with techniques such as SEM-EDX and ATR/FT-IR. The better anticorrosion performance of the coatings containing La(4-OHCin)3 has been demonstrated independently of the surface finish. Also, optimum coating and inhibitor concentrations have been found and a correlation between the structural and morphological properties of the coatings and their anticorrosion performance has been identified.
KW - Carbon steel
KW - Corrosion inhibitor
KW - Rare-earth carboxylate
KW - Sol-gel coating
KW - Solid-state NMR
UR - http://www.scopus.com/inward/record.url?scp=85105874354&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2021.149881
DO - 10.1016/j.apsusc.2021.149881
M3 - Article
AN - SCOPUS:85105874354
SN - 0169-4332
VL - 561
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 149881
ER -