Molybdate-phosphate conversion coatings to protect steel in a simulated concrete pore solution

Verbruggen, Hilke; Baert, Kitty; Terryn, Herman; Graeve, Iris De

doi:10.1016/j.surfcoat.2018.09.056

Cited by 21 publications

(15 citation statements)

References 47 publications

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“…Before coating, the Q235 carbon steel specimen (Dongguan Tengwei Metallic Material Co., Ltd., Dongguan, China) was abraded with metallographic paper (#400, #500, #600, #800 and #1000 garde), then sonicated in acetone for 5 min, followed by the subsequent rinsing with ethanol and deionized water [ 33 ]. The epoxy coatings were deposited onto the carbon steel bar measuring 12-mm diameter and 30-mm length.…”

Section: Methodsmentioning

confidence: 99%

Corrosion Protection of Q235 Steel Using Epoxy Coatings Loaded with Calcium Carbonate Microparticles Modified by Sodium Lignosulfonate in Simulated Concrete Pore Solutions

Liu

Huang

et al. 2021

Materials

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In this study, calcium carbonate (CaCO3) microparticles having pH-sensitive properties were loaded with sodium lignosulfonate (SLS), a corrosion inhibitor. Scanning electron microscope (SEM), UV–VIS spectrophotometer (UV-vis), X-ray diffraction (XRD), and attenuated total reflection-Fourier-transform infrared spectroscopy (ATR-FTIR) were applied to evaluate the properties of the synthetic microparticles. This material could lead to the release of corrosion inhibitor under different pH conditions of the aqueous media. However, the extent of release of the corrosion inhibitor in the acidic media was higher, leading to enhanced shielding effect of the Q235 steel. These microparticles can serve as anti-corrosion additive for epoxy resin-coated Q235 steel. Electrochemical experiments were used to assess the anti-corrosive ability of the epoxy coatings in simulated concrete pore (SCP) solution, confirming the superior corrosion inhibition of the epoxy coating via incorporation of 5 wt % calcium carbonate microparticles loaded with SLS (SLS/CaCO3). The physical properties of coating specimens were characterized by water absorption, contact angle, adhesion, and pencil hardness mechanical tests.

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Section: Methodsmentioning

confidence: 99%

Corrosion Protection of Q235 Steel Using Epoxy Coatings Loaded with Calcium Carbonate Microparticles Modified by Sodium Lignosulfonate in Simulated Concrete Pore Solutions

Liu

Huang

et al. 2021

Materials

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“…5 In order to overcome these problems, a number of alternative treatments are proposed using chrome-free solutions such as phosphate (P), 6,7 rare earth salt, 8 permanganate, 9 titanate/zirconate (Ti/Zr), 10,11 and molybdate (Mo). 12,13 However, some problems remain to be solved for these methods. For example, the phosphating process can lead to the accumulation of P in water.…”

Section: Introductionmentioning

confidence: 99%

“…Verbruggen et al 13 found that good barrier properties and active corrosion protection could be attained at an optimum Mo/P ratio. Liang et al 15 showed that Mo conversion coating on Al foil AA8021 had good corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Growth process of molybdate conversion coating on the surface of aluminum foil and its adhesive mechanism

Chen

2021

Surface & Interface Analysis

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In this study, an environmentally friendly molybdate (Mo) conversion coating was deposited on the surface of aluminum (Al) foil for use as the packaging film of lithium-ion battery, and the surface morphology and chemical composition were characterized by field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), energy dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The XPS results show that the conversion coating is composed of MoO 3 , MoO x , Al 2 O 3 , and (MoO 3 ) x (P 2 O 5 ) y . Then, the effects of treatment time on the corrosion resistance of Al foil and the adhesive strength between Mo-treated Al foil and maleic anhydride (MAH)-grafted polypropylene (MPP) were investigated. It is revealed that both the peeling strength and the corrosion resistance of Mo-treated Al foil increase with the treatment time.

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“…However, the carbonation of concrete and the penetration of Cl − may cause breakdown of the passive film easily, resulting in significant corrosion of the reinforcing steel [1][2][3][4][5][6][7] . In order to mitigate or ultimately eliminate the corrosion of reinforcing steel in concrete, many methods for corrosion protection have been used, including uses of protective coatings 8,9 , cathodic protection 1,10 and applications of corrosion inhibitors [11][12][13][14][15] . Among them, the use of corrosion inhibitors is a very promising method because it is effective, inexpensive and easy-to-operate.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Environmentally Friendly Diisooctyl Sebacate-based Mixed Corrosion Inhibitor on Reinforcing Steel

Guo¹,

Jin²,

Shao³

et al. 2020

Acta Phys Chim Sin

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Corrosion protection of reinforcing steel in concrete is an urgent task in modern society. Use of corrosion inhibitors in concrete is an effective, simple, and economical method for protecting reinforcing steel from corrosion. Mixed corrosion inhibitors usually perform better than a single inhibitor in actual reinforced concrete systems because of their synergistic inhibition effects. In recent years, environmentally friendly corrosion inhibitors have attracted increasing attention from corrosion researchers. Diisooctyl sebacate and sodium D-gluconate are environmentally friendly organic corrosion inhibitors, and ZnSO4 is an inorganic cathodic inhibitor, they may form an innovative, nontoxic, and pollution-free mixed corrosion inhibitor to control reinforcing steel corrosion. Additionally, diisooctyl sebacate and sodium D-gluconate serve as absorption-type inhibitors, and ZnSO4 acts as a precipitation-type inhibitor. We hypothesized that their combination might show a good synergistic corrosion inhibition effect on reinforcing steel. In this study, we developed a diisooctyl sebacate-based mixed corrosion inhibitor that includes D-gluconate and ZnSO4 and investigated its synergistic inhibition effects on reinforcing steel (Q235 steel) corrosion in a simulated polluted concrete pore solution. The reinforcing steel corrosion behavior and the properties of the mixed corrosion inhibitor were studied by polarization curve measurements, electrochemical impedance spectroscopy tests, and surface analysis methods (scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy). The results indicated that the reinforcing steel in the simulated polluted concrete pore solution (pH 11.00, 0.5 mol•L −1 NaCl) was in an active dissolving state and that localized corrosion took place. The mixed corrosion inhibitor, consisting of diisooctyl sebacate (59 mmol•L −1 ), sodium D-gluconate (0.5 mmol•L −1 ), and ZnSO4 (1.5 mmol•L −1 ), had an obvious and powerful inhibition effect. Its inhibition efficiency reached 96.8% and 90.0% in the simulated polluted concrete pore solution and the cement mortar, respectively. The mixture of diisooctyl sebacate with sodium D-gluconate and ZnSO4 acted as a mixed-type inhibitor and effectively controlled both anodic and cathodic reactions of the steel corrosion.

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Molybdate-phosphate conversion coatings to protect steel in a simulated concrete pore solution

Cited by 21 publications

References 47 publications

Corrosion Protection of Q235 Steel Using Epoxy Coatings Loaded with Calcium Carbonate Microparticles Modified by Sodium Lignosulfonate in Simulated Concrete Pore Solutions

Corrosion Protection of Q235 Steel Using Epoxy Coatings Loaded with Calcium Carbonate Microparticles Modified by Sodium Lignosulfonate in Simulated Concrete Pore Solutions

Growth process of molybdate conversion coating on the surface of aluminum foil and its adhesive mechanism

Effect of an Environmentally Friendly Diisooctyl Sebacate-based Mixed Corrosion Inhibitor on Reinforcing Steel

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