Influence of phosphate ion on the morphology, adhesion strength, and corrosion performance of zirconium-based surface treatment

Ghanbari, Ali; Attar, M.M.

doi:10.1007/s11998-015-9694-z

Cited by 7 publications

(6 citation statements)

References 29 publications

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“…The surface free energy, calculated by the van Oss–Chaudhury–Good method, was calculated to be 18.8 mJ m −2 (Table 1). The surface energy value is significantly lower in comparison to the control surface and other reported surfaces further confirming the low adhesive nature of the super surface prepared herein 36–39…”

Section: Resultssupporting

confidence: 73%

Engineering a nanostructured “super surface” with superhydrophobic and superkilling properties

et al. 2015

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We present a nanostructured “super surface” fabricated using a simple recipe based on deep reactive ion etching of a silicon wafer. The topography of the surface is inspired by the surface topographical features of dragonfly wings. The super surface is comprised of nanopillars 4 μm in height and 220 nm in diameter with random inter-pillar spacing. The surface exhibited superhydrophobicity with a static water contact angle of 154.0° and contact angle hysteresis of 8.3°. Bacterial studies revealed the bactericidal property of the surface against both gram negative (Escherichia coli) and gram positive (Staphylococcus aureus) strains through mechanical rupture of the cells by the sharp nanopillars. The cell viability on these nanostructured surfaces was nearly six-fold lower than on the unmodified silicon wafer. The nanostructured surface also killed mammalian cells (mouse osteoblasts) through mechanical rupture of the cell membrane. Thus, such nanostructured super surfaces could find applications for designing self-cleaning and anti-bacterial surfaces in diverse applications such as microfluidics, surgical instruments, pipelines and food packaging.

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Section: Resultssupporting

confidence: 73%

Engineering a nanostructured “super surface” with superhydrophobic and superkilling properties

et al. 2015

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“…Pull-off tests, cathodic disbonding tests and EIS measurements indicated that a Zr-based coating on mild steel significantly improved adhesion of an epoxy topcoat. 56 The Zr coating increased the surface roughness (from 70 to 98 nm), which improved the adhesion of an organic topcoat and cathodic disbonding resistance as measured by EIS during 192 h in 3.5 wt% NaCl.…”

Section: Adhesion Strength and Delamination Mechanism Of The Substratmentioning

confidence: 96%

“…The pH of 4.0 was used in the vast majority of reports. 6,36,37,42,51,52,[55][56][57]61,62,65,68,75,[85][86][87][88]94,98,108,109 although conversion was carried out at pH between 1.5 and 6. 30,32,46,48,49,53,64,66,[68][69][70]77,78,82,90,95,99,106,107,110 More extensive and thicker coating formation at pH 4.0 than at 2.9 was noticed for Gardabond X4707 coating on AA6060.…”

Section: Conversion Bath Parametersmentioning

confidence: 99%

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Review—Conversion Coatings Based on Zirconium and/or Titanium

Milošev

Frankel

2018

J. Electrochem. Soc.

156

113

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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...

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“…The environmentally acceptable non-chromate based conversion coatings i.e. phosphate [13][14][15][16][17], molybdate [18], zirconium [19] and rare earth metal salts [20][21][22][23] have been considered in this regard.…”

Section: Introductionmentioning

confidence: 99%

Improved performance of cerium conversion coatings on steel with zinc phosphate post-treatment

Ramezanzadeh

Vakili

Amini

2015

Journal of Industrial and Engineering Chemistry

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Influence of phosphate ion on the morphology, adhesion strength, and corrosion performance of zirconium-based surface treatment

Cited by 7 publications

References 29 publications

Engineering a nanostructured “super surface” with superhydrophobic and superkilling properties

Engineering a nanostructured “super surface” with superhydrophobic and superkilling properties

Review—Conversion Coatings Based on Zirconium and/or Titanium

Improved performance of cerium conversion coatings on steel with zinc phosphate post-treatment

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