Degradation mechanism of metal–polymer composites undergoing electrolyte induced delamination

Abstract

This research was focused on the study of delamination phenomena in metal-polymer laminates used in containers. The selected material was an electrolytic chromium coated steel (ECCS), protected by polyethylene teraphthalate (PET). The study employed an acetic acetate medium, which has been proved to degrade the PET coating depriving it from its protective capacity. The experiments consisted of electrolyte induced delamination of the PET by anodic-cathodic polarisation. The main objective was to investigate the degradation mechanisms in order to explain how the presence of electrochemical activity in the delamination cross-section front detaches the PET coating and leads to subsequent propagation of this delamination. Finally, specific delamination models were proposed for the electrochemical conditions investigated, and the degradation was characterised by SEM. The induced delamination experiments applied to the ECCS-PET composite in an acetic acetate medium allowed to discriminate between the delamination processes proper for anodic polarisation and those for cathodic polarisation.

Electrophoretic deposition of linear polyethylenimine and composite films

“…12 Polymers are of special interest for the surface modification of materials. [13][14][15] Polyethylenimine (PEI) has been widely used as a coating material for particles of various materials, such as hydroxyapatite for chromatography of biomolecules, 16 magnetic particles for biomedical and other applications, 17,18 platinum nanoparticles for catalysis 19 and carbon nanotubes for application in sensors. 20 Several investigations were focused on the fabrication of composite films by combined electrochemical methods, based on electrophoresis of PEI and electrosynthesis or electrophoretic deposition (EPD) of metal oxides and hydroxides.…”

Local delamination on heavily deformed polymer–metal interfaces: evidence from microscopy

“…The polymer-metal laminate studied here is a laminate of electrolytically chromium-coated steel (ECCS) with PET as previously used for corrosion susceptibility research [1]; to study effects of microstructure and heat treatments on corrosion and to study electrolyte-induced delamination [12][13][14]; and to show the corrosion inhibiting effect [3] of the chromium layer and the PET layer, and to test several polymer coatings' quality [4]. The pre-rolled steel substrate has a thickness of 0.225 mm and has been electrolytically coated with a Cr layer with a thickness varying between 6 and 15 nm, similar to that examined by Boelen et al [1].…”

Effects of nanoparticles on the corrosion resistance of fluoropolymer coatings on mild steel

“…7 However, all organic coatings are permeable to corrosive species such as oxygen, water and ions to some extent in practice. [8][9][10][11] In the last few years, investigations of the preparation of fluoropolymer coatings have been considered due to its characteristic of the fluoropolymer coatings, such as weather resistance, excellent chemical resistance, low surface energy and so on. 12,13 Nevertheless, there have been few reports about fluoropolymer coatings modified by nanoparticles so far.…”

“…7 However, all organic coatings are permeable to corrosive species such as oxygen, water and ions to some extent in practice. 8-11…”