Studies on preparation of phosphate pigments for application in composite protective coatings

Przywecka, Katarzyna; Grzmil, Barbara; Kowalczyk, Krzysztof; Sreńscek-Nazzal, Joanna

doi:10.1016/j.porgcoat.2018.02.009

Cited by 10 publications

(3 citation statements)

References 22 publications

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“…Heucophos CAPP, a calcium aluminum polyphosphate silicate hydrate provided by Heubach, Langelsheim Germany, was used as a zinc-free phosphate corrosion inhibitor for hot-dip galvanized steel. 38 The reference solution used for all measurements was 0.05 M NaCl, relevant for building construction steel applications. Moreover, this concentration is preferred for future local electrochemical research.…”

Section: Methodsmentioning

confidence: 99%

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

Meeusen¹,

Zardet²,

Homborg³

et al. 2019

J. Electrochem. Soc.

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In this paper, different macroscopic electrochemical techniques are applied to study the corrosion inhibitor efficiency, protection mechanism and stability of a calcium aluminum polyphosphate silicate hydrate inhibitor on hot-dip galvanized steel in the timedomain. Potentiodynamic polarization (PP) measurements are applied to study the anodic and cathodic mechanistic behavior as well as inhibitor efficiencies at discrete and single times of exposure. Open circuit potential (OCP) with superimposed linear polarization resistance (LPR) measurements are applied as a faster, non-invasive alternative to PP, characterizing the overall performance of the system in terms of the polarization resistance. Electrochemical impedance spectroscopy (EIS) measurements are applied to detail both the overall performance of the system as well as the corrosion inhibition mechanism related to the electrochemical system's physicochemical representation over time. Electrochemical noise (EN) measurement are used to evaluate the inhibition efficiency as a function of exposure time, represented by the electrochemical noise resistance. Odd random phase electrochemical impedance spectroscopy (ORP-EIS) is selected as the electrochemical tool to study the system's instability, by evaluation of the non-linearities and non-stationarities over time. The non-stationarities present in the inhibitor-containing electrochemical system are shown to cause the overall instability of the system and should be taken into account when interpreting results from the different techniques over time.

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Section: Methodsmentioning

confidence: 99%

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

Meeusen¹,

Zardet²,

Homborg³

et al. 2019

J. Electrochem. Soc.

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“…The formed microcracks lead to the penetration of corrosive media into the coating layers and thereby reach the metal substrate to facilitate the formation of corrosion cells and accelerate the corrosion 1,2,18 . To solve defects of waterborne coating, a physical barrier was conventionally established to enhance the anti‐corrosion performance by incorporating various nano‐materials, such as zinc, 19 phosphate pigments, 20 mesoporous silica nanocontainers, 21 carbon nanotubes, 22 nanoclay, 23 and polyaniline nanoparticles, 24 etc.…”

Section: Introductionmentioning

confidence: 99%

Enhanced anti‐aging and anti‐corrosion performance of waterborne epoxy coating layers over the dual effects of g‐C₃N₄ photocatalysis

Chen

Fei

et al. 2022

J of Applied Polymer Sci

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To overcome the drawbacks of waterborne epoxy (WEP) films, various fillers were employed to eliminate the microcracks and microporous in the coating layers. Here, photocatalysis (g‐C3N4) was incorporated into WEP coating to achieve improved long‐term anti‐aging and anti‐corrosion performance via dual effects, including barrier effects through the formation of dense and uniform composite film as well as the photocatalytic effects. The chemical structure, chemical states, photoabsorption properties, and morphology of g‐C3N4/WEP films were analyzed. Effects of g‐C3N4 content on the mechanical properties, water resistance, anti‐corrosion behaviors, anti‐permeation property, and photocatalytic activity of g‐C3N4/WEP (x‐CN/WEP) composites were investigated by salt spray test, electrochemical impedance spectroscopy, and RhB degradation experiments. 2‐CN/WEP coating with the addition of 2% g‐C3N4 displayed the optimum mechanical property, water resistance, anti‐permeation, anti‐corrosion, and anti‐aging performance. The anti‐corrosion mechanisms of x‐CN/WEP composite coating were also summarized, which consists in the formation of chemical bonds between g‐C3N4 and WEP, uniform distribution of g‐C3N4 in WEP, and the photocatalytic performance of g‐C3N4.

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“…Over the years, many studies have been performed on the modifi cation of already available pigments. It may be the introduction of other elements, particle size reduction or the replacement of phosphate anion with the others [11][12][13][14][15][16][17][18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Anticorrosive and physicochemical properties of modified phosphate pigments

Przywecka

Grzmil

Kowalczyk

2019

Polish Journal of Chemical Technology

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Many studies have been carried out in the direction of improvement of the effectiveness of commonly utilized phosphate corrosion inhibitors. For this purpose various types of modifications are realized, e.g. introduction of different cations to the pigment composition or replacement of phosphate anions with others. In the presented work, anticorrosive pigments containing calcium hydrogen phosphate, and/or calcium hydroxyphosphate, and calcium molybdate were obtained. The phase and chemical composition and the oil absorption number of those materials were determined. The anticorrosive properties were investigated by an electrochemical noise method. The obtained results were compared with previously published studies concerning pigments containing (NH4)3Al2(PO4)3 and/or AlPO4, and CaMoO4. It was found that the pigment containing only calcium molybdate(VI) is not an effective corrosion inhibitor. However, the pigments comprising a mixture of CaHPO4 and CaMoO4 exhibited good anticorrosive properties and they were characterized by higher effectiveness in the corrosion protection than compared materials.

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Studies on preparation of phosphate pigments for application in composite protective coatings

Cited by 10 publications

References 22 publications

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

Enhanced anti‐aging and anti‐corrosion performance of waterborne epoxy coating layers over the dual effects of g‐C₃N₄ photocatalysis

Anticorrosive and physicochemical properties of modified phosphate pigments

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Studies on preparation of phosphate pigments for application in composite protective coatings

Cited by 10 publications

References 22 publications

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

A Complementary Electrochemical Approach for Time-Resolved Evaluation of Corrosion Inhibitor Performance

Enhanced anti‐aging and anti‐corrosion performance of waterborne epoxy coating layers over the dual effects of g‐C3N4 photocatalysis

Anticorrosive and physicochemical properties of modified phosphate pigments

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Product

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Enhanced anti‐aging and anti‐corrosion performance of waterborne epoxy coating layers over the dual effects of g‐C₃N₄ photocatalysis