Phosphate loaded layered double hydroxides for active corrosion protection of carbon steel

Sui, Yongqiang; Li, Xuehui; Bai, Shuangfeng; Li, Xiangbo; Sun, Zhiyong

doi:10.1080/1478422x.2021.1976086

Cited by 8 publications

(3 citation statements)

References 33 publications

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“…The controlled release of the active agent from the nanocarriers was previously shown to prolong the action of the additive and to allow a reduction of toxicity (Martins et al, 2022). Furthermore, the positive effect of the implementation of active agents in LDH for application in protective coatings was demonstrated by many researchers for different materials (Poznyak et al, 2009;Tedim et al, 2012;Sui et al, 2022). The use of LDH is especially relevant for offshore applications, where the presence of chloride ions is typical in the environment: after penetration through the coating, chloride ions enable the release of the active anion from LDH through the ionexchange mechanism, allowing the detection of the initiation of corrosion processes (Bouali et al, 2020).…”

Section: Previous Work and Noveltymentioning

confidence: 99%

A novel smart coating with hexacyanoferrate intercalated layered double hydroxides nanoadditive for early detection of carbon steel corrosion

et al. 2023

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The detection of corrosion at early stages could increase the service life of metal-based infrastructures in a cost-effective manner. Despite the recent progress in “smart” self-reporting corrosion sensing coatings, the development of environmentally friendly systems appropriate for steel substrate used in offshore applications remains a relevant challenge. In this study, a novel smart corrosion sensing coating, based on hexacyanoferrate intercalated Mg-Al LDH nanoadditive, was developed, aiming at the detection of early-stage corrosion of carbon steel. The detection mechanism is based on the ability of hexacyanoferrate ions to react with iron cations generated during the corrosion process, giving rise to a colorimetric signal, while LDH carriers provide a controlled release of active ions under corrosion conditions. The sensing nanoadditive was embedded into a commercial pigment-free water-based acrylic polyurethane coating. The nanomaterial was characterized structurally (XRD) and morphologically (STEM). The compatibility of the additive with the polymer formulation and its influence on the resulting coating performance was investigated in terms of rheological behavior, structure (FTIR), morphology (SEM/EDS), thermal (TGA, DSC) and mechanical (adhesion, hardness) properties. The corrosion protection ability of the coating was evaluated via EIS, while the sensing functionality was analyzed by visual analysis of the surface. The developed coating successfully detects early-stage corrosion of steel substrate at a lab scale, in conditions relevant to the use of metallic structures in offshore applications, demonstrating a correlation between the level of material degradation and the spectroscopic signal associated with the presence of the LDH functional nanoadditive. Furthermore, the observed decrease in coating barrier properties, caused by the presence of LDH, was overcome by the subsequent development of a multilayer coating system. Two different topcoats (epoxy- and polyurethane-based) were surveyed for this purpose, showing an improvement in the coating barrier properties without influencing the corrosion detection functionality of the sensing layer. The results were successfully validated by standard salt spray tests. The multilayer approach opens up the possibility to model coatings with different characteristics for various operating conditions.

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Section: Previous Work and Noveltymentioning

confidence: 99%

A novel smart coating with hexacyanoferrate intercalated layered double hydroxides nanoadditive for early detection of carbon steel corrosion

et al. 2023

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“…The Nyquist plots of different specimens have a significant effect on the diameter of the semicircle. A larger diameter of capacitor arc implies good corrosion resistance [23]. Thus, the corrosion resistance of low alloy marine steel in seawater with 100 ppm available chlorine is the worst.…”

Section: Eis Testsmentioning

confidence: 99%

Influence of available chlorine on corrosion behaviour of low alloy marine steel in natural seawater

Liu

Sui

Zhou

et al. 2023

Corrosion Engineering, Science and Technology

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Available chlorine is known to play a significant role in metal corrosion due to its oxidising properties. In this paper, the effect of available chlorine concentration on corrosion behaviour of the low alloy marine steel was investigated by electrochemical and immersion tests. Experimental results show that the corrosion rate of low alloy marine steel is accelerated with the increase of available chlorine concentration in seawater. The localised electrochemical dissolution of the steel is more active with the concentration of available chlorine increasing. Energy dispersive spectroscopy (EDS) was performed to understand the composition of the corrosion products that the large enrichment of Cl element occurred for the high available chlorine concentration (100 ppm) after 720 h exposure to seawater. The influence of available chlorine concentration on mechanical property of low alloy marine steel indicatesthe less impact on the tensile and yield strength of the low alloy marine steel.

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“…One of the common methods of protecting metal structures from corrosion is paint coatings, which must have high durability in corrosive environments and at the same time be environmentally friendly [1][2][3]. To ensure corrosion resistance, inhibiting pigments are introduced into the coatings [4][5][6][7]. Several existing inhibiting pigments, such as chromates, show high efficiency but are toxic and cause environmental pollution [8,9].…”

Section: Introductionmentioning

confidence: 99%

Aluminium alloy corrosion inhibition by a two-stage modified nanoporous zeolite

Korniy

Zin

Khlopyk

et al. 2022

Corrosion Engineering, Science and Technology

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A two-stage synthesis of anti-corrosion pigments based on synthetic zeolites was performed. New pigments retain the zeolite framework structure in the nanopores of which the amorphised phosphate phase is formed. The pigments effectively reduce the aluminium alloy corrosion in sodium chloride solution. The most effective pigment is obtained by mechanochemical modification of zeolite with calcium cations, followed by liquid-phase treatment with zinc nitrate and sodium phosphate. The pigments induce the formation of a protective film of zinc hydroxides on intermetallic inclusions of the alloy. The formation of phosphates is possible on the anode sections. The pigments can become promising inhibitory components of primer paints used for the protection of structures made from aluminium alloys.

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Phosphate loaded layered double hydroxides for active corrosion protection of carbon steel

Cited by 8 publications

References 33 publications

A novel smart coating with hexacyanoferrate intercalated layered double hydroxides nanoadditive for early detection of carbon steel corrosion

A novel smart coating with hexacyanoferrate intercalated layered double hydroxides nanoadditive for early detection of carbon steel corrosion

Influence of available chlorine on corrosion behaviour of low alloy marine steel in natural seawater

Aluminium alloy corrosion inhibition by a two-stage modified nanoporous zeolite

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