Composition and corrosion protection of hexafluorozirconic acid treatment on steel

Khun, Nay Win; Frankel, G. S.

doi:10.1002/maco.201508255

Cited by 22 publications

(25 citation statements)

References 41 publications

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“…On the other hand, the Zr-based treatment increases the corrosion potential in the delaminated area which can leads to a lower oxygen reduction rate, hence decreasing the hydroxyl ion formation at the delamination front in the cathodic region [18,48]. It is good to mention that the results presented here are in full agreement with the work of Khun et al who studied the effect of the hexafluorozirconic acid pretreatment on cathodic delamination of epoxy coating from carbon steel substrates and showed that the treatment can improve delamination and corrosion resistance of carbon steel at neutral pH, reporting this to be due to better interfacial adhesion [28,29].…”

Section: Skpsupporting

confidence: 82%

“…This is promising for industrial application aiming for a robust and reproducible process. Khun et al [28,29] studied the effect of hexaflurozirconic acid treatment on corrosion protection and adhesion strength of polyurethane and epoxy coatings applied on carbon steel and zinc showed that the Zr-based pretreatment resulted in enhanced corhttp://dx.doi.org/10.1016/j.porgcoat.2016.11.016 0300-9440/© 2017 Elsevier B.V. All rights reserved. rosion protection and adhesion performance of the organic coatings [34].…”

Section: Introductionmentioning

confidence: 99%

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The influence of a Zr-based conversion treatment on interfacial bonding strength and stability of epoxy coated carbon steel

Sababi

Terryn

Mol

2017

Progress in Organic Coatings

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Section: Skpsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

The influence of a Zr-based conversion treatment on interfacial bonding strength and stability of epoxy coated carbon steel

Sababi

Terryn

Mol

2017

Progress in Organic Coatings

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“…63 Volta potential profiles of the uncoated carbon steel and epoxy-coated steel with different pre-treatment time in Zr-conversion bath are presented in Fig. 13.…”

Section: Adhesion Strength and Delamination Mechanism Of The Substratmentioning

confidence: 99%

“…At shorter formation times (60 s), the TecTalis coating contained Cu, Cu 2 O and CuO. 63 At longer times (180 s) the content of CuO decreased, indicating that prolonged treatment promotes the formation of Cu 2 O in the ZrO 2 layer. The behavior on alloys can be different as discussed below.…”

mentioning

confidence: 96%

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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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Effect of powder size on the long‐term corrosion performance of pure aluminium coatings on mild steel by cold spraying

Xiao-hui

et al. 2016

Materials & Corrosion

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To achieve the long‐term corrosion protection of mild steel under corrosive environment, pure aluminium coatings were cold sprayed (CS) on mild steel with three different powder sizes, namely within the three following classes 85–100, 60–75 and 40–50 µm. The as‐sprayed samples were exposed to the atmosphere for 11 years. The long‐term corrosion behaviour of the sprayed steels was studied by atmospheric exposure, immersion tests as well as electrochemical measurements in 3.5 wt% sodium chloride (NaCl) solution. It was found that the coatings with coarse powder reduced the long‐term corrosion resistance of the samples. The deteriorated corrosion resistance of the sprayed samples was ascribed to the penetration of the corrosive medium (oxygen, water and electrolyte) through the porosity defects of coatings and with coarse powder. These results provide a guide for the design of cold sprayed corrosion‐resistance pure Al coatings for engineering applications.

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Composition and corrosion protection of hexafluorozirconic acid treatment on steel

Cited by 22 publications

References 41 publications

The influence of a Zr-based conversion treatment on interfacial bonding strength and stability of epoxy coated carbon steel

The influence of a Zr-based conversion treatment on interfacial bonding strength and stability of epoxy coated carbon steel

Review—Conversion Coatings Based on Zirconium and/or Titanium

Effect of powder size on the long‐term corrosion performance of pure aluminium coatings on mild steel by cold spraying

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