Marianne Seter

New 'green' corrosion inhibitors based on rare earth compounds

A series of rare earth organic compounds pioneered by our group have been shown to provide a viable alternative to the use of chromates as corrosion inhibitors for some steel and aluminium applications. For example we have shown that the lanthanum 4-hydroxy cinnamate offers excellent corrosion mitigation for mild steel in aqueous environments while rare earth diphenyl phosphates offer the best protection in the case of aluminium alloys. In both cases the protection appears to be related to the formation of a nanometre thick interphase occurring on the surface that reduces the electrochemical processes leading to metal loss or pitting. Very recent work has indicated that we may even be able to address the challenging issue of stress corrosion cracking of high strength steels. Furthermore, filiform corrosion can be suppressed when selected rare earth inhibitor compounds are added as pigments to a polymer coating. There is little doubt from the work thus far that a synergy exists between the rare earth and organic inhibitor components in these novel compounds. This paper reviews some of the published research conducted by the senior author and colleagues over the past 10 years in this developing field of green corrosion inhibitors.

Dual active ionic liquids and organic salts for inhibition of microbially influenced corrosion

We describe a series of novel compounds designed to combat the bacterial growth that leads to microbially induced corrosion on steel in the marine environment. A synergistic effect of the ionic components in these dual active organic salts is demonstrated.

Cetrimonium Nalidixate as a Multifunctional Inhibitor to Combat Biofilm Formation and Microbiologically Influenced Corrosion

Microbial infection of surfaces and the formation of biofilms is a pervasive problem that appears in diverse fields from medical implants to corrosion of marine structures. We show here, for the first time, the multifunctional inhibitory effects of an environmentally friendly organic salt, cetrimonium nalidixate, a dual active compound based on concepts emerging from the active ionic liquids field. This salt when incorporated into a polyurethane coating leads to complete inhibition of microbiologically influenced corrosion in the presence of several bacteria strains commonly found in marine environments.

Chiral rings from BINOL dicarboxylic acids and alkane ditin(IV) linkers

Abstract The first series of building blocks for metal-organic frameworks (MOFs) utilizing the (S)-2,2′-diethoxy-1,1′-binaphthyl-6,6′-dicarboxylic acid ligand linked with a number of α,ω-bis(chlorodiorganostannyl) alkane spacers and α,ω-bis(dichloroorganostannyl) alkane spacers has been synthesized and characterized. The new compounds have been shown to form monomeric chiral rings with the potential to generate large coordination networks. The potential formation of chiral supramolecular and polymeric materials from the chiral precursors was explored by investigating the structures that form as a result of the hypervalency available at metal centers. These chiral compounds were built using the concept that stemmed from the construction of MOFs. The ‘pre-organized’ chiral rings synthesized here can potentially find use in chiral catalysis, enantioselective synthesis and in designing chiral polymers.