The delamination of polymeric coatings from electrogalvanised steel – a mechanistic approach.

Fürbeth, W.; Stratmann, M.

doi:10.1016/s0010-938x(00)00047-0

Cited by 176 publications

(175 citation statements)

References 19 publications

Supporting

Mentioning

167

Contrasting

Unclassified

Order By: Relevance

“…This process, which is termed cathodic delamination, is recognized as one of the primary mechanism of coating failure on steel. [129][130][131][132][133] Cathodic delamination dramatically decreases with increased surface roughness of the underlying steel substrate, as shown by the SKP technique. 103 Adhesion strength of the conversion coating is dependent on the substrate pre-treatment, as shown by blister test for acetoacetate coatings on various conversion coatings on AA2024-T3.…”

Section: Adhesion Strength and Delamination Mechanism Of The Substratmentioning

confidence: 95%

Review—Conversion Coatings Based on Zirconium and/or Titanium

Milošev

Frankel

2018

J. Electrochem. Soc.

156

113

View full text Add to dashboard Cite

There is a growing interest in conversion coatings based on titanium and/or zirconium as the result of the health and environmental issues associated with legacy chromate and phosphate conversion coatings. Any alternative technology should be environmentally friendly and cost effective, and also able to achieve comparable corrosion resistance and paint adhesion for ferrous and non-ferrous substrates. Conversion coatings based on titanium or zirconium seem to fulfill many of these requirements and thus offer a great potential for further applications. This literature review summarizes the scientific results in this rapidly growing area of research. Following the description of composition of conversion bath and deposition mechanism, the effects of process parameters for conversion baths such as pH, temperature, immersion time and agitation are presented together with coating characteristics. The effects of the type of substrate and substrate pre-treatment are explored for the most-studied substrates: Al alloys, zinc-coated steels and steels. Properties such as composition, morphology and thickness are summarized. The corrosion performance of the conversion coatings is discussed, as well as adhesion of organic coatings and delamination mechanism for a full coating system including substrate/coating/top-coat. Metals used in the construction of products and facilities in most applications, including industrial, infrastructure, transportation, construction, consumer goods, etc., are primarily selected from three groups: steels, zinc-coated (galvanized) steels, and aluminum alloys (AA).1 All of these materials require protection to prevent environmental degradation, and the most common approach to protection against corrosion is a multilayer coating system. Metal components are treated by a series of processes to create this coating system: cleaning, surface pre-treatment, and application of organic coating layers including primer and topcoat. Surface pre-treatments include anodizing (for aluminum alloys) and conversion coatings, which are the focus of this review. Conversion coatings are formed by immersion of a component in a chemical bath and reaction of the metal substrate with the components in the bath to form a layer that coats the surface. These layers provide some corrosion protection by acting as a barrier to the environment or releasing corrosion-inhibiting species. However, their primary role is to improve the adhesion of subsequently applied paint layers.The most important conversion coatings used for corrosion protection and adhesion promotion of ferrous and non-ferrous metal substrates are chromate conversion coatings (CCCs) and phosphate coatings. CCCs are highly corrosion protective. They consist of a backbone of chromium oxide/hydroxide with Cr in the 3+ oxidation state and also contain compounds with Cr in the 6+ oxidation state. 2-5The Cr(VI) provides the characteristic of self-healing, which is the ability to reform a protective coating after it has been breached by a mechanical or chemical proces...

show abstract

Section: Adhesion Strength and Delamination Mechanism Of The Substratmentioning

confidence: 95%

Review—Conversion Coatings Based on Zirconium and/or Titanium

Milošev

Frankel

2018

J. Electrochem. Soc.

156

113

View full text Add to dashboard Cite

show abstract

“…[35][36][37][38] In cathodic delamination, a delamination front headed by a region of oxygen reduction and followed by a region of metal dissolution propagates at the coating/metal interface. [38][39][40][41] Silanes covalently bound to the interface can significantly slow down delamination. 42 Ion migration to balance the electronic current through the solid is an important part of the mechanism.…”

mentioning

confidence: 99%

Waterborne chitosan–epoxysilane hybrid pretreatments for corrosion protection of zinc

Fernández-Solis

Erbe

2016

Biointerphases

View full text Add to dashboard Cite

Biopolymer-based systems are extensively studied as green alternatives for traditional polymer coatings, e.g. in corrosion protection. Chitosan-epoxysilane hybrid films are presented in this work as a chitosan-based protective system, which could e.g. be applied in a pretreatment step. For the preparation of the chitosan-epoxysilane hybrid systems, a sol-gel procedure was applied. The function of the silane is to ensure adhesion to the substrate. On zinc substrates, homogeneous thin films with thickness of 50 − 70 nm were obtained after thermal curing. The hybrid-coated zinc substrates were characterized by infrared (IR) spectroscopy, ellipsometry and X-ray photoelectron spectroscopy (XPS). As model corrosion experiments, linear polarization resistance was measured, and cathodic delamination of the weak polymer coating poly(vinylbutyral) [PVB] was studied using scanning Kelvin probe. Overall, chitosanepoxysilane hybrid pretreated samples showed lower delamination rates than unmodified chitosan coatings and pure PVB. Electrochemical impedance spectroscopy (EIS) confirmed a reduced ion permeability and water uptake by chitosan-epoxysilane films compared to that of a non-modified chitosan coating. Even though the coatings are hydrophobic and contain water, they slow down cathodic delamination by limiting ion transport.

show abstract

“…Fürbeth et al [32,36] described the delamination of Zn coated with a model polymer coating by the cathodic delamination mechanism presented in Fig. 11a.…”

Section: Origin Of the Electrochemical Response For The Cathodic Drivmentioning

confidence: 99%

Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics

Shkirskiy

Volovitch

Vivier

2017

Electrochimica Acta

View full text Add to dashboard Cite

To cite this version:V Shkirskiy, P Volovitch, Vincent Vivier. Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics. Electrochimica Acta, Elsevier, 2017, 235, pp.442-452 AbstractLocal Electrochemical Impedance Mapping (LEIM) methodology was adopted to quantify the propagation of electrochemically active regions with a micrometric precision. The method consisted in the use of the gradient modulus of the admittance map as a parameter for the spatial quantification. Numerical simulations were used to optimize the experimental conditions, namely the AC frequency, the distance between the local bi-probe and the working electrode, and the distances between the probes for the local bi-probe used for the local current mapping. This analysis was reinforced by experimental verifications on coated electrodes. The quantitative LEIM methodology was successfully applied to follow the delamination kinetics on Zn coated with the polyvinyl butyral polymer in NaCl solutions. At 1 kHz, the LEIM response only reflected the position of the anodic front beneath the polymer because oxygen reduction reaction was diffusion limited and hence, independent of the applied potential. This novel LEIM methodology completes the set of usual tools used to investigate the delamination mechanisms on metal substrates.

show abstract

The delamination of polymeric coatings from electrogalvanised steel – a mechanistic approach.

Cited by 176 publications

References 19 publications

Review—Conversion Coatings Based on Zirconium and/or Titanium

Review—Conversion Coatings Based on Zirconium and/or Titanium

Waterborne chitosan–epoxysilane hybrid pretreatments for corrosion protection of zinc

Development of quantitative Local Electrochemical Impedance Mapping: an efficient tool for the evaluation of delamination kinetics

Contact Info

Product

Resources

About