Waterborne chitosan–epoxysilane hybrid pretreatments for corrosion protection of zinc

Fernández-Solis, Christian; Erbe, Andreas

doi:10.1116/1.4944828

Cited by 9 publications

(22 citation statements)

References 61 publications

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“…A double logarithmic plot, in the style shown elsewhere, 8,12 confirmed that the progress of the delamination front scaled linearly with time t after an initiation phase where delamination progress scaled with an exponent > 1. (The fast initial delamination may be caused by the preparation method of the artificial defect used here.)…”

Section: Resultsmentioning

confidence: 78%

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Cyclodextrins as Carriers for Organic Corrosion Inhibitors in Organic Coatings

Altin

Rohwerder

Erbe

2017

J. Electrochem. Soc.

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Coatings are widely applied on metal surfaces for protection against corrosion. Once a coating is damaged and a defect is filled by aqueous solutions, delamination of the coating initiates further materials degradation. Cathodic delamination can be suppressed by adding active additives to the coating matrix. In this study, the impact was investigated of β-cyclodextrin inhibitor complex (β-CD [Inh]) additives in polyvinylbutyral model coatings on the cathodic delamination of coatings on zinc, using the scanning Kelvin probe (SKP). With the presence of the β-CD [Inh] in the coating, a decrease was observed of the delamination rate to 1/4 of that in the reference system without β-CD [Inh]. Release experiments using UV-Vis spectroscopy showed that in the presence of cyclodextrins, the released concentration of the inhibitor 2-mercaptobenzothiazole from the coating increased. The increase was most pronounced under alkaline conditions, where the released concentration within 24 h increased by a factor of 6 compared to a reference system without β-CD. Zinc and its alloys are industrial products for cathodic corrosion protection of steel components. They are hence used in a variety of applications, e.g. in metallic coatings.1 On the other hand, zinc may corrode itself actively, which is why a protection of the metal is needed. A straightforward way to protect non-noble metals such as zinc against corrosion is the application of organic coatings. 2-4

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Section: Resultsmentioning

confidence: 78%

“…7 (On the other hand, the presence of water and electrolytes is not sufficient for fast coating failure. 8 ) A further consequence is that the coating may start to delaminate, exposing more free metal surface. 9 The fastest mechanism of coating delamination initiated from a defect is cathodic delamination.…”

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confidence: 99%

Cyclodextrins as Carriers for Organic Corrosion Inhibitors in Organic Coatings

Altin

Rohwerder

Erbe

2017

J. Electrochem. Soc.

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“…47,48 For the measurements, the polymer-grafted samples were covered with a ≈1 μm thick, spin-coated PVB top layer to avoid electrolyte spreading above the PMMA modified surface. 4,49 Sample sets were assessed simultaneously in the SKP chamber, i.e. exposed to the same environment with the aim to avoid interference due to variations of oxygen partial pressure or relative humidity.…”

Section: Stability Of Polymer Layers-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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“…Our group has recently investigated the possibility to use the biopolymer chitosan as ingredient in passive corrosion protection systems on zinc to limit ion mobility along the interface [11]. The cyclic oligosaccharide β-cyclodextrin was used to enhance corrosion inhibitor availability by incorporation into a model coating on zinc and into a zinc oxide based pretreatment [12,13].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical contrast switching between black and white appearance of gelatin-covered zinc

Ksiazkiewicz¹,

Fernández-Solis²,

Erbe³

2020

J. Phys. Mater.

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Zinc and its alloys are widely used in the surface protection of metallic structural materials. Thus, zinc is an interesting and relevant candidate material for preparing stimuli-responsive surfaces. In this work, the switching of the optical appearance of zinc between black and white by an applied electrode potential is demonstrated. The zinc surface was covered by gelatin films and subjected to cyclic voltammetry (CV) in a chloride-containing electrolyte which induced pitting corrosion on the zinc surface. Between the different parts of the CV cycles, a reversible change in optical appearance was observed. During the oxidative half-cycles, the surfaces appear white, and during the reductive half-cycles, the surfaces appear brown to black, i.e. dark. Surface characterisation by x-ray photoelectron spectroscopy (XPS) and infrared (IR) spectroscopy shows that the gelatin coating is slightly oxidised during intial stages of the process, but remains intact and present at the surface. Raman spectra prove the presence of ZnO at the interface. Surface analysis shows only minor differences in composition between the black and white surfaces. Based on the available characterisation data, the white appearance associated with anodic currents is attributed to the formation of a non-passivating ZnO. The black appearance associated with cathodic currents is attributed to reduction of surface-confined zinc species, including ZnO and Zn 2+ . The role of the gelatin is presumably to prevent diffusion of the dissolution products into solution by complex formation and by acting as a diffusion barrier; gelatin will also affect the morphology of the reduction products. A similar switching was observed when gelatin was added to chloride electrolyte; surface analysis showed gelatin adsorption in this case. The black/white switching may, e.g. be useful for surfaces self-indicating corrosion potentials of galvanised steel.

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Waterborne chitosan–epoxysilane hybrid pretreatments for corrosion protection of zinc

Cited by 9 publications

References 61 publications

Cyclodextrins as Carriers for Organic Corrosion Inhibitors in Organic Coatings

Cyclodextrins as Carriers for Organic Corrosion Inhibitors in Organic Coatings

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

Electrochemical contrast switching between black and white appearance of gelatin-covered zinc

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