Modification of zinc powder to improve the corrosion resistance of weldable primers

Bastos, A.C.; Zheludkevich, Mikhail L.; Klüppel, Ingo; Grundmeier, Guido; Ferreira, M.G.S.

doi:10.1016/j.porgcoat.2010.04.021

Cited by 28 publications

(16 citation statements)

References 10 publications

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“…In a bid to improve the corrosion resistance of zinc-rich coatings, researchers have developed various ways to prolong the lifetime of zinc-rich coatings. Such as modification of the zinc particles [12][13][14], fabrication of repairable superhydrophobic surfaces [15], change of shape and size of zinc particles [16,17], changes in the pigment/binder ratio [18,19], and incorporation of metal or nonmetal pigments [20][21][22][23]. Almost all the above studies have been focused on improving the corrosion protection efficiency and barrier properties of zinc-rich coatings, which include extending the diffusion path of corrosive solution, decreasing coating porosity, strengthening the electroconnection of the pigments, and reducing electrochemical activities of zinc particles.…”

Section: Introductionmentioning

confidence: 99%

Interface Characteristics and Anticorrosion Performances of Cold Galvanizing Coatings Incorporated with γ-chloropropyl Triethoxysilane on Hot-Dip Galvanized Steel

Wang

Gao

et al. 2021

Coatings

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The cold galvanizing coatings (CGCs) are used to repair old hot-dip galvanized steel (HDG) in numerous anticorrosion engineering, but poor adhesion of the CGC restricts its large-scale applications in the industries. For the purpose of overcoming the weak adhesion problems of the CGC on HDG, γ-chloropropyl triethoxysilane (CPTES) was added directly into cold galvanizing coatings (CPTES/CGC). Interface characteristics and related corrosion protection behaviors were investigated by the pull-off adhesion test, water contact angle measurements, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and electrochemical tests. The experimental results revealed that, there is an increase by 19.1% of the CPTES/CGC surface free energy when compared with that of CGC. In addition, Si–O–Si and Si–O–Zn bonds were found in the CPTES/CGC, which indicate new network structures formed inside the CPTES/CGC, between the interface of the CPTES/CGC and HDG substrate, resulting in dry adhesion, wet adhesion, and the cathodic protection time of CPTES/CGC increased by 50% and 200% and 300% respectively compared with the CGC.

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Section: Introductionmentioning

confidence: 99%

Interface Characteristics and Anticorrosion Performances of Cold Galvanizing Coatings Incorporated with γ-chloropropyl Triethoxysilane on Hot-Dip Galvanized Steel

Wang

Gao

et al. 2021

Coatings

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“…This spectrum can be numerically fitted by an equivalent electrical circuit (EEC) consisting of a capacitor and a resistor in parallel. The capacitor represents the coating capacitance (Ccoat) and the resistor the pore resistance (Rpore) as commonly described in literature (Walter, 1986;Amirudin and Thieny, 1995;González-García et al, 2007;Bastos et al, 2010;Hauffman et al, 2013). When the barrier is disrupted, the effect of the underlying layers becomes visible.…”

Section: First Self-healing Action: Effect Of Mbtmentioning

confidence: 99%

“…The second one, which is initially less pronounced, shows the effects at the metal-solution interface. A double layer capacitance (Cdl) and a charge transfer resistance (Rct) of the corrosion reaction are commonly used to describe these effects of the passivation layer (Walter, 1986;Amirudin and Thieny, 1995;González-García et al, 2007;Bastos et al, 2010;Hauffman et al, 2013). To account for imperfections of the real systems constant phase elements have generally been used instead of pure capacitances.…”

Section: First Self-healing Action: Effect Of Mbtmentioning

confidence: 99%

A Multiple-Action Self-Healing Coating

et al. 2016

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This article describes a self-healing coating for corrosion protection of metals, which combines two different types of self-healing mechanisms in one coating with multiple-healing functionality. 2-Mercaptobenzothiazole (MBT) was loaded into layered double hydroxide (LDH) carriers that were mixed into an acrylated polycaprolactone polyurethane-based shape-recovery coating and applied on hot-dip galvanized steel (HDG). The effect of triggered release of MBT on the protection of HDG became visible when samples with manually applied defects in the coating were immersed in 0.05 M NaCl solution (first, autonomous-healing mechanism). The shape recovery (second, non-autonomous-healing mechanism) was triggered by heating the samples for 2 min to 60°C. SEM-EDX and Raman spectroscopy proved the presence of MBT in the LDH, in the MBT-loaded LDH in the coating and the released MBT on the HDG surface in the damaged area after being in contact with a solution containing corrosive ions. Electrochemical impedance spectroscopy and scanning vibrating electrode technique demonstrate the corrosion protection effect of MBT in the coating with a defect and the restoration of the barrier properties of the coating after defect closure. This way, the independent mechanisms of this multi-action self-healing coating could be demonstrated.

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“…Anticorrosive pigments are added to the organic coatings to obtain long-term corrosion protection (Chang et al ., 2012; Weng et al ., 2010). These pigments are able to enhance the corrosion-protection properties of the coatings through three main protection mechanisms including barrier, inhibitive and sacrificial mechanisms (Alvarez et al ., 2016; Bastosa et al ., 2010; Deya et al ., 2002; Dhoke and Khanna, 2009a, 2009b; Kouloumbi et al ., 1977; Williams et al ., 2012). Among these mechanisms, anticorrosive pigments with inhibitive action have been used to obtain coatings with longer corrosion protection service life.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical studies on the corrosion performance of new advanced anticorrosive pigments

Ahmed

El-Gawad

Elshami

et al. 2017

PRT

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Purpose This study aims to synthesize a series of new anticorrosive pigments using a new technique called “core-shell”. This technique is based on depositing thin surface layer of expensive, efficient anticorrosive pigment on a cheap extender. This extender forms the bulk of the new pigments. The new pigments were constructed on cores of either waste silica fume or kaolin comprising 80-85 per cent of their chemical structure, and the ferrite shell was about of 20-15 per cent. Electrochemical studies were undertaken on two series of pigments for comparison between ferrites/silica fume and ferrites/kaolin pigment to show their performance, as the shells are different. Design/methodology/approach The different ferrites/silica fume and ferrites/kaolin pigments were characterized using different analytical and spectrophotometric techniques, such as X-ray fluorescence (XRF) and transmission electron microscopy (TEM). Immersion test and electrochemical impedance measurements were done in 3.5 per cent NaCl. Findings The tests revealed that paint films containing Sr ferrite/silica and Ca ferrite/kaolin were the most effective in corrosion prevention. Practical implications Silica fumes have a large array of uses. These pigments can be applied in various industries such as painting, wooding coating, anti-corruption coating, powder coating, architectural paint and waterproof paints. Treated kaolin can be applied in many industries besides pigment manufacture and paint formulations; it can be applied as a reinforcing filler in rubber, plastics and ceramic composites. Originality/value The new pigments are considered ecofriendly materials, because using them converts a waste product and a natural ore to useful marketable product, leading to reducing cost and saving the environment at the same time.

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Modification of zinc powder to improve the corrosion resistance of weldable primers

Cited by 28 publications

References 10 publications

Interface Characteristics and Anticorrosion Performances of Cold Galvanizing Coatings Incorporated with γ-chloropropyl Triethoxysilane on Hot-Dip Galvanized Steel

Interface Characteristics and Anticorrosion Performances of Cold Galvanizing Coatings Incorporated with γ-chloropropyl Triethoxysilane on Hot-Dip Galvanized Steel

A Multiple-Action Self-Healing Coating

Electrochemical studies on the corrosion performance of new advanced anticorrosive pigments

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