Comparison of cathodic delamination of poly(n‐alkyl methacrylates) on iron

Ochoa, Jesus S. Mondragon; Altin, Abdulrahman; Erbe, Andreas

doi:10.1002/maco.201609289

Cited by 3 publications

(4 citation statements)

References 35 publications

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“…Obviously, the chain packing in PS makes PS more protective than PMMA. Aromatic PS is also more hydrophobic than PMMA, which likely contributes to the lower delamination rate . However, there is not much difference in the delamination rates for cross‐linked PS coatings, which is different from the situation for PMMA .…”

Section: Resultsmentioning

confidence: 98%

Cathodic delamination kinetics of thin polystyrene model coatings bound to zinc via organosilanes

Iqbal

Rechmann

Bashir

et al. 2018

Materials & Corrosion

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The cathodic delamination of poly(styrene) [PS] model coatings from oxide‐covered zinc has been evaluated by scanning Kelvin probe (SKP). Linear and acrylate cross‐linked PS model coatings covalently bound to zinc oxide via ZnOSi bonds have been prepared. PS was prepared by thermally initiated free radical polymerization in the presence of vinyltrimethoxy silane modified zinc. Cross‐linkers ethylene glycol diacrylate (EDA) and hexanediol diacrylate (HDA) were used in some preparations. Resulting polymers are 8–15 nm thick. PS model coatings show a delamination rate of only ≈20% of that of comparable poly(methyl methacrylate) [PMMA] samples. The slower cathodic delamination of PS is attributed to denser chain packing and higher amounts of hydrophobic moieties, leading to a reduction in penetration of corrosive species. As opposed to the situation in PMMA, the addition of HDA increases the delamination rate, due to its flexible chains and hydrophilic groups. The lowest delamination rate is observed in the presence of 25% EDA. Consequently, ester hydrolysis of acrylates accelerates delamination, it is however not the main factor in cathodic delamination of such thin model system.

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Section: Resultsmentioning

confidence: 98%

Cathodic delamination kinetics of thin polystyrene model coatings bound to zinc via organosilanes

Iqbal

Rechmann

Bashir

et al. 2018

Materials & Corrosion

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“…In particular, an investigation of several acrylates on iron showed that PMMA alone is an extremely weak coating, weaker even than PVB. 14 It is therefore expected on that basis that purely linear PMMA does not contribute a lot to slowing down delamination. The additional effect observed in the zinc system may hence be related to crosslinking via side reactions in the polymerization process performed in that work.…”

Section: Resultsmentioning

confidence: 99%

“…4,7 For the progress of cathodic delamination, the rate of oxygen reduction at the surface is crucial, 8,9 but ion transport is important as well. 10 For the particular case of iron and mild steel, polymer covered systems have been the subject of many investigations with the aim of improving resistance to and understanding mechanism of cathodic delamination, 7,[11][12][13][14] however, typically without control of the interfacial bonding between iron and the polymer.…”

mentioning

confidence: 99%

Delamination Kinetics of Thin Film Poly(acrylate) Model Coatings Prepared by Surface Initiated Atom Transfer Radical Polymerization on Iron

Mondragón-Ochoa

Altin

Rechmann

et al. 2018

J. Electrochem. Soc.

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Living radical polymerization is often considered as an unsuitable method of surface modification for reactive metals such as iron. Necessary noble metal catalyst systems may react with the surface to be modified, causing deactivation of the catalyst. Here, surface-initiated atom transfer radical polymerization (SI-ATRP) using the typical Cu I-based catalyst was used to synthesize welldefined poly(methyl methacrylate) thin films grafted on iron. Alkoxy-and chloro-silane initiators were anchored to the metal surface via Si-O-Fe bonds in a metal pretreatment step, yielding a thin cross-linked multilayer sol/gel coating. Except for the precursor's leaving group, the resulting 10s of nm thick polymer layers were almost identical. Assessment of the delamination kinetics of the model coatings by scanning Kelvin probe (SKP) showed the average delamination to be ≈40 % lower in the systems with alkoxyprecursor compared to those with chloro-precursor. In addition, the spread of the measured delamination rates decreased to 1/3 in the alkoxy system, despite identical polymers. The higher delamination rate in the case of chloro-precursors was attributed to residual chloride at the interface. Initiator surface coverage differences may also contribute to stability differences. The ATRP-Cu I-catalyst is consequently also suitable for surface modification of non-noble metals after appropriate pretreatment.

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“…A main aim of this work is to broaden the data basis for understanding the chemical processes during cathodic delamination by comparing systems with well-defined interfacial linkage, − thus broadening the understanding of the chemical processes during cathodic delamination in the presence of weak model top coatings . Deadhesion kinetics with a weak model top coating was characterized by scanning Kelvin probe (SKP) experiments, in line with community standards .…”

Section: Introductionmentioning

confidence: 99%

Molybdate and Phosphate Cross-Linked Chitosan Films for Corrosion Protection of Hot-Dip Galvanized Steel

Fernández-Solis,

Keil,

Erbe

2023

ACS Omega

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Environmentally friendly and sustainable methods to protect hot-dip galvanized (HDG) steel from corrosion are extensively studied. Films of the biopolymer polyelectrolyte chitosan were ionically cross-linked in this work with the wellknown corrosion inhibitors phosphate and molybdate. Layers on this basis are presented as components in a protective system and could, e.g., be applied in pretreatments similar to a conversion coating. For the preparation of the chitosan-based films, a procedure involving sol−gel chemistry and wet-wet application was utilized. Homogeneous films of few micrometers thickness were obtained on HDG steel substrates after thermal curing. Properties of chitosan-molybdate and chitosan-phosphate films were compared with purely passive epoxysilane-cross-linked chitosan, and pure chitosan. Delamination behavior of a poly(vinyl butyral) (PVB) weak model top coating studied by scanning Kelvin probe (SKP) showed an almost linear time dependence over >10 h on all systems. Delamination rates were 0.28 mm h −1 (chitosan-molybdate) and 0.19 mm h −1 (chitosan-phosphate), ca. 5% of a non-cross-linked chitosan reference and slightly higher than of the epoxsyilane cross-linked chitosan. Immersion of the treated zinc samples over 40 h in 5% NaCl solution yielded a 5-fold increase of the resistance in the chitosan-molybdate system, as evidenced by electrochemical impedance spectroscopy (EIS). Ion exchange of electrolyte anions with molybdate and phosphate triggers corrosion inhibition, presumably by reaction with the HDG surface as well described in the literature for these inhibitors. Thus, such surface treatments have potential for application, e.g., in temporary corrosion protection.

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Comparison of cathodic delamination of poly(n‐alkyl methacrylates) on iron

Cited by 3 publications

References 35 publications

Cathodic delamination kinetics of thin polystyrene model coatings bound to zinc via organosilanes

Cathodic delamination kinetics of thin polystyrene model coatings bound to zinc via organosilanes

Delamination Kinetics of Thin Film Poly(acrylate) Model Coatings Prepared by Surface Initiated Atom Transfer Radical Polymerization on Iron

Molybdate and Phosphate Cross-Linked Chitosan Films for Corrosion Protection of Hot-Dip Galvanized Steel

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