Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Sörensen, Paul; Weinell, Claus Erik; Dam‐Johansen, Kim; Kiil, Søren

doi:10.1007/s11998-010-9267-0

Cited by 24 publications

(6 citation statements)

References 49 publications

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“…Radical intermediates have been shown to occur in the ORR. , Here, only a radical reaction can explain all the results without involvement of a complex coupling of polymer degradation and, e.g., zinc oxide dissolution. Previous reports have shown a decrease in delamination rate in the presence of radical scavengers …”

Section: Resultsmentioning

confidence: 88%

Synthesis of Ultrathin Poly(methyl methacrylate) Model Coatings Bound via Organosilanes to Zinc and Investigation of Their Delamination Kinetics

Iqbal

Rechmann

Sarfraz

et al. 2014

ACS Appl. Mater. Interfaces

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Polymer coatings are widely used to protect metals from corrosion. Coating adhesion to the base material is critical for good protection, but coatings may fail because of cathodic delamination. Most of the experimental studies on cathodic delamination use polymers to study the corrosion behavior under conditions where the interfacial chemistry at the metal(oxide)/polymer interface is not well-defined. Here, ultrathin linear and cross-linked poly(methyl methacrylate) [PMMA] coatings that are covalently bound to oxide-covered zinc via a silane linker have been prepared. For preparation, zinc was functionalized with vinyltrimethoxysilane (VTS), yielding a vinyl monomer-covered surface. These samples were subjected to thermally initiated free radical polymerization in the presence of methyl methacrylate (MMA) to yield surface-bound ultrathin PMMA films of 10-20 nm thickness, bound to the surface via Zn-O-Si bonds. A similar preparation was also carried out in the presence of different amounts of the cross-linkers ethylene glycol diacrylate and hexanediol diacrylate. Functionalized and polymer-coated zinc samples were characterized by infrared (IR) spectroscopy, secondary ion mass spectrometry (SIMS), ellipsometry, and X-ray photoelectron spectroscopy (XPS). Coating stability toward cathodic delamination has been evaluated by scanning Kelvin probe (SKP) experiments. In all cases, the covalently linked coatings show lower delamination rates of 0.02-0.2 mm h(-1) than coatings attached to the surface without covalent bonds (rates ∼10 mm h(-1)). Samples with a higher fraction of cross-linker delaminate slower, with rates down to 0.03-0.04 mm h(-1), compared to ∼0.3 mm h(-1) without cross-linker. Samples with longer hydrophobic alkyl chains also delaminate slower, with the lowest observed delamination rate of 0.028 mm h(-1) using hexanediol diacrylate. For the coatings studied here, delamination kinetics is not diffusion limited, but the rate is controlled by a chemical reaction. Several possibilities for the nature of this reaction are discussed; radical side reactions of the oxygen reduction are the most likely path of deadhesion.

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Section: Resultsmentioning

confidence: 88%

Synthesis of Ultrathin Poly(methyl methacrylate) Model Coatings Bound via Organosilanes to Zinc and Investigation of Their Delamination Kinetics

Iqbal

Rechmann

Sarfraz

et al. 2014

ACS Appl. Mater. Interfaces

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show abstract

“…There are two main scenarios: firstly, the delamination of intact, undamaged coatings that are subject to applied cathodic protection; secondly, disbonding of coatings ahead of a through-thickness coating defect. The presence of alkali metal cations is generally essential for failure to occur and it is also accepted that either interfacial alkalisation 16 , or the formation of free radical intermediaries during the step-wise reduction of oxygen 17 , are responsible for coating failure. A correlation of disbonding rate with cation mobility or diffusivity for coatings under cathodic protection was first noted by Leidheiser 18 who found, for model polybutadiene coatings, that ionic diffusion through the film thickness accounted for the observed disbonding kinetics.…”

Section: Coating Adhesionmentioning

confidence: 99%

Advances in corrosion protection by organic coatings: What we know and what we would like to know

Lyon

Bingham

Mills

2017

Progress in Organic Coatings

352

144

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“…P.A. Sørensen et al described antioxidants (i.e., free radical scavengers and peroxide decomposers) have been incorporated into various generic types of coatings to investigate the effect of antioxidants on the rate of cathodic delamination of epoxy coatings on coldrolled steel [110]. Testing using substrates prepared from stainless steel, copper, aluminum, galvanized steel, and brass also showed a reduction in the rate of cathodic delamination when the coating was modified with a free radical scavenger.…”

Section: Determination Of the Anticorrosion And Antioxidant Propertiementioning

confidence: 99%

Relationship between the inhibition and antioxidant properties of the plant and biomass wastes extracts – A Review

Vorobyova¹,

Скіба²,

Shakun³

et al. 2019

Int. J. Corros. Scale Inhib.

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Corrosion inhibitors are the only most widely applied method for corrosion protection of metallic materials and are of particular importance in industry. Nowadays, the synthesis of corrosion inhibitors using traditional multistep reactions is highly restricted because of the increasing demands of "green chemistry". Plant materials and biomass wastes are ideal green candidatures to replace traditional toxic corrosion inhibitors. Literature survey reveals that different extracts of the plant and agro-food wastes contain naturally phytochemical compounds which have antioxidant properties have been effectively employing as sustainable inhibitors for the corrosion of different metals and alloys. Nevertheless, despite the numerous research papers, the reviews in which the correlation between the antioxidant/free radical scavenging activity of the extracts and their inhibition action is explained are not represented in the literature. This paper provides a brief overview of current knowledge in what kind of methods are used to estimate the antioxidant content, which classes of compounds provide higher antiradical activity and poses questions that we need to answer in order to use parameter of the antioxidant activity as a predictive index for performance evaluation of the plants/biomass wastes extracts as corrosion inhibitors. The conclusion is that no single mechanism of antioxidant actions and anticorrosive protection is operative in plant/wastes extracts. The high inhibitory efficiency is predicated on a number of complementary processes working holistically. By developing the theoretical basis and mechanism of action between the anticorrosive and antioxidant properties of plant extracts, it is possible to create predictive tools for selecting plant extract and further obtaining anti-corrosion protection based on it.

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Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Cited by 24 publications

References 49 publications

Synthesis of Ultrathin Poly(methyl methacrylate) Model Coatings Bound via Organosilanes to Zinc and Investigation of Their Delamination Kinetics

Synthesis of Ultrathin Poly(methyl methacrylate) Model Coatings Bound via Organosilanes to Zinc and Investigation of Their Delamination Kinetics

Advances in corrosion protection by organic coatings: What we know and what we would like to know

Relationship between the inhibition and antioxidant properties of the plant and biomass wastes extracts – A Review

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