Hybrid Zinc-Rich Paint Coatings

Gergely, András; Pászti, Zoltán; Bertóti, I.; Mihály, Judith; Drotár, Eszetr; Törók, Tamás I.

doi:10.1016/b978-0-12-411467-8.00006-4

Cited by 8 publications

(9 citation statements)

References 92 publications

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“…By the comparison of these two types of nanotubes, the scope of the study is to delineate preferable quantities of the nanotubes applicable within zinc‐rich paints to enhance active and passive corrosion prevention ability. Favorable compositions of the PDAMIPs and hybrid paints are discussed in the 2nd part 18.…”

Section: Methodsmentioning

confidence: 99%

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MenD from Bacillus subtilis: A Potent Catalyst for the Enantiocomplementary Asymmetric Synthesis of Functionalized α‐Hydroxy Ketones

et al. 2013

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The thiamine diphosphate‐dependent enzyme 2‐succinyl‐5‐enolpyruvyl‐6‐hydroxy‐3‐cyclohexene‐1‐carboxylate synthase (MenD) catalyzes a Stetter‐like 1,4‐addition of α‐ketoglutarate to isochorismate in the biosynthesis of menaquinone (vitamin K). Here, we describe the carboligation potential of MenD from Bacillus subtilis (BsMenD) for the nonphysiological 1,2‐addition of decarboxylated α‐ketoglutarate (succinylsemialdehyde) and various benzaldehyde derivatives. Furthermore, we engineer BsMenD variants for the enantiocomplementary asymmetric synthesis of functionalized α‐hydroxy ketones. Wild type BsMenD shows an excellent chemo‐ as well as high (R)‐selectivity for the carboligation of α‐ketoglutarate as the donor, and different benzaldehyde derivatives as acceptor yielding (R)‐α‐hydroxy ketones with up to >99 % ee. By engineering (S)‐selective BsMenD variants, based on the recently developed S‐pocket concept, we provide access to most of the corresponding (S)‐α‐hydroxy ketones with up to 98 % ee. In particular, benzaldehyde and meta‐substituted derivatives were converted with high enantioselectivities (ee of 91–98 % (S)). The significantly higher (S)‐selectivity of BsMenD variants than recently published MenD variants from Escherichia coli, could be attributed to a second‐shell residue next to the S‐pocket. A glycine residue, adjacent to the major S‐pocket residues I476 and F477 (standard numbering), is assumed to result in higher structural flexibility in the S‐pocket region of BsMenD, which in turn could result in improved stabilization of the antiparallel orientation of the acceptor.

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Section: Methodsmentioning

confidence: 99%

“…Therefore, this study is focused on nano and microstructure, spectroscopic and electrochemical properties of the PDAMIPs. In the 2nd part 18, corrosion protection of the hybrid coatings is discussed.…”

Section: Introductionmentioning

confidence: 99%

MenD from Bacillus subtilis: A Potent Catalyst for the Enantiocomplementary Asymmetric Synthesis of Functionalized α‐Hydroxy Ketones

et al. 2013

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“…Therefore, researches have been performed to develop ZRC with long‐time cathodic protection by partial substitution of zinc pigments with conductive fillers. Carbon nanotubes (CNTs) were added to the ZRC for improving the electrical contact between the particles . It was found that the CNTs could provide higher electrical conductivity with a lower zinc concentration.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, considerable amount of papers have reported that the graphene/polymer composite possesses enhanced barrier properties that are beneficial for high anticorrosion performances . Unlike carbon nanotubes that can only provide similar mechanical benefits, these lightweight sheets can reduce oxygen permeability of host membranes . It also should be noted that the graphene process outstanding electrical conductivity, which can increase the conductivity of coatings when doped into the polymer matrixes.…”

Section: Introductionmentioning

confidence: 99%

Effect of graphene on the electrochemical protection of zinc‐rich coatings

Song

Qian

2018

Materials & Corrosion

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The effect of graphene on electrochemical protection of zinc‐rich coatings was studied by electrochemical impedance spectroscopy (EIS) and the monitoring of open circuit potential (OCP) versus time of immersion. The obtained results show that addition of 2.5 wt% graphene to zinc‐rich coating prolongs the lifetime of cathodic protection to mild steel immersion in sodium chloride solution. On the basis of these consistent finds, two protective mechanisms of graphene are assumed. On the one hand, the embedded graphene could serve as electrical conduction paths between zinc particles. On the other hand, the more distributed graphene may lead to the galvanic corrosion of mild steel.

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“…Many efforts have been focused to solve the high insolubility of CPs in coatings formulations, in order to improve the dispersion and efficiency of CPs as anticorrosive additive. As an example, Gergely et al have recently studied the corrosion protection of zinc‐rich epoxy paint coatings with highly dispersed PPy‐deposited alumina monohydrate particles , achieving a well‐balanced active/passive function in the hybrid coating containing zinc and PPy. Hou et al studied the incorporation of different size of PAni nanoparticles to an epoxy paint, obtaining good results with nanoparticles doped with FeCl 2 .…”

Section: Introductionmentioning

confidence: 99%

Soluble polythiophenes as anticorrosive additives for marine epoxy paints

Martí

Armelín

Iribarren

et al. 2013

Materials and Corrosion

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This study compares the resistance against corrosion of a marine epoxy primer modified with Zn 3 (PO 4 ) 2 (10 wt. %) or a small concentration (0.3 wt. %) of conducting polymer as inorganic or organic anticorrosive pigment, respectively. More specifically, the behavior of three different conducting polymers has been evaluated: polyaniline emeraldine base, poly(3-thiophen-3-yl-acrylic acid methyl ester) and poly(2-thiophen-3-yl-malonic acid dimethyl ester), the latter two being soluble polythiophene derivatives bearing carboxylate side groups.In a first stage, the structural, thermal and mechanical properties of all the modified epoxy coatings were characterized using infrared spectroscopy, thermogravimetric analyses and stress-strain assays, respectively. After this, accelerated corrosion assays have evidenced that the degree of protection imparted by a small concentration of polyaniline is higher than that obtained using 10 wt. % of Zn 3 (PO 4 ) 2 . Indeed, polyaniline has been found to be more effective as anticorrosive additive than the two polythiophene derivatives. This fact has been attributed to the electroactivity of the former, which is higher than that of the latter. Thus, the ability to store charge has been proposed to be also responsible of protection against corrosion imparted by organic additives, based on conducting polymers.

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Hybrid Zinc-Rich Paint Coatings

Cited by 8 publications

References 92 publications

MenD from Bacillus subtilis: A Potent Catalyst for the Enantiocomplementary Asymmetric Synthesis of Functionalized α‐Hydroxy Ketones

MenD from Bacillus subtilis: A Potent Catalyst for the Enantiocomplementary Asymmetric Synthesis of Functionalized α‐Hydroxy Ketones

Effect of graphene on the electrochemical protection of zinc‐rich coatings

Soluble polythiophenes as anticorrosive additives for marine epoxy paints

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