Corrosion Process of Inorganic Zinc-Rich Painted Steel Exposed to a High-Chloride Atmospheric Environment

Nagasawa, Michiyasu; Okada, Nobuhiro; Ōtsuka, N.; Ohtsuka, Toshiaki

doi:10.2355/isijinternational.isijint-2017-548

Cited by 7 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…After exposure, coating A and B showed almost the same absorption bands. Around 1580 cm −1 and 1400 cm −1 , these bands indicated the formation of carbonate, generally associated with hydrozincite (HZ) Zn 5 (OH) 6 (CO 3 ) 2 [8,[76][77][78]. Some other bands, found at 1050 cm −1 , 890 cm −1 , and 710 cm −1 are linked to the presence of SK [76,78].…”

Section: Ftir Studymentioning

confidence: 94%

“…Zinc-rich coatings (ZRC) are one way to achieve this, as they are high-performance anticorrosion films containing not only zinc, but also other components. They consist in embedding zinc particles into a binder, usually based, for example, on an organic resin, polyester or epoxy polymers [3][4][5][6], or an inorganic silicate-based product to form a polysiloxane network [3,7,8]. The final product is a composite coating, with metallic zinc pigments maintained together in a matrix.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Aluminum Flakes on Corrosion Protection Behavior of Water-Based Hybrid Zinc-Rich Coatings for Carbon Steel Substrate in NaCl Environment

Boidot

Gheno²,

Bentiss

et al. 2022

Coatings

View full text Add to dashboard Cite

In this study, waterborne hybrid organic-inorganic zinc rich coatings (ZRC) with different aluminum flake amounts were tested at low thickness in 3 wt% NaCl aqueous solution. Open circuit potential and impedance response evolution over time were measured experimentally to evaluate their anticorrosion properties. Microstructure of the investigated coatings and composition of the corrosion products were also determined by electron microscopy, X-ray diffraction and infrared spectroscopy, while the stability of the coatings was investigated via inductively coupled plasma optical emission spectroscopy. The results showed that the absence of aluminum flakes leads to a less stable matrix, unable to retain sufficient corrosion inhibitors, resulting in a shorter protection time. For an intermediate concentration of aluminum particles, good corrosion properties were observed. Corrosion products play an important role in the protection mechanism, with simonkolleite and hydrozincite accumulating over time, forming a protective layer on the substrate for several weeks. High amounts of aluminum also lead to the formation of corrosion products, but without providing a barrier effect, while rapidly consuming zinc, leading to rapid formula failure. These results indicate that the use of a controlled amount of aluminum flakes can significantly improve the corrosion protection capability of this type of coating.

show abstract

Section: Ftir Studymentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effect of Aluminum Flakes on Corrosion Protection Behavior of Water-Based Hybrid Zinc-Rich Coatings for Carbon Steel Substrate in NaCl Environment

Boidot

Gheno²,

Bentiss

et al. 2022

Coatings

View full text Add to dashboard Cite

show abstract

“…仮の濃度 c' を用いて式 (13) から電荷密度を算出するこの電荷密度分布から発生する電位Φを式 (15) のポアソン方程式から算出する Cathodic polarization curve of the before and after exposed specimen 2) .…”

Section: ．緒言unclassified

“…EPMA analysis of the inorganic zinc primer cross-section of the primer layer after the 5 years exposure test2) . EPMA analysis of the inorganic zinc primer cross-section of the primer layer after the 5 years exposure test2) .…”

mentioning

confidence: 99%

Numerical Analysis of Corrosion Phenomena of Inorganic Zinc Primer Painted on Steel Plate

Okada

Nagasawa

Ōtsuka

2018

ZAKAEP

Self Cite

View full text Add to dashboard Cite

Steel plate painted by inorganic zinc primer has high performance of corrosion protection by zinc particles. However, details of corrosion mechanism are not clear. Numerical analysis model is valid to make clear that of initial corrosion mechanism. We have been developed a numerical analysis model of corrosion phenomena, which can calculate ions movement and chemical reactions. From calculation result, zinc particles were corroded at first by rich dissolved oxygen and corrosion products such as MgCO 3 and CaCO 3 were precipitated around the zinc particles at the top of the primer. The calculated distributions of MgCO 3 and CaCO 3 were agreed with the cross section EPMA analysis results of exposed specimen, but the calculated distribution of zinc corrosion products were different from the cross section EPMA analysis results of exposed specimen. After several studies, it was cleared that cathodic current density of the painted steel after exposure test was decreased to 1/8 from that of before exposure. Numerical reanalysis was conducted with 1/8 decreased cathodic current density of the zinc particle, and then corrosion products of zinc were agreed with the EPMA cross section. It indicates that the corrosion products around the zinc particles disturbed oxygen diffusion and its cathodic current density was decreased.

show abstract

“…Compared with unctuous coating, water-based coating has the advantages of lower cost, less environmental pollution and excellent comprehensive performance for the anti-corrosion of oil and gas transportation pipelines [11][12][13]. The water-based inorganic zinc-rich coating usually refers to the silicate of alkali metals including Li, Na, K as film forming material, water as the solvent, and free metal zinc powder as the main anti-rust pigment composition [14][15][16][17]. The aqueous solution of alkali metal silicate is the main factor to determine the coating varieties and properties [18,19].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Interface Properties between Water-Based Inorganic Zinc Silicate Coating Modified by Organosilicone and Iron Substrate

Gao¹,

Xiong²,

Zhang³

et al. 2023

Journal of Renewable Materials

View full text Add to dashboard Cite

The interface properties of Fe(101)/zinc silicate modified by organo-siloxane (KH-570) was studied by using the method of molecular dynamics simulation. By calculating the temperature and energy fluctuation of equilibrium state, equilibrium concentration distribution, MSD of layer and different groups, and interaction energy of two interface models, the influencing mechanism on the interface properties of adding organosiloxane into coating system was studied at the atomic scale. It shows that the temperature and energy of interface oscillated in a small range and it was exited in a state of dynamic equilibrium within the initial simulation stage (t < 20 ps). It can be seen from the multiple peak states of concentration distribution that the iron substrate, organo-siloxane and zinc silicate are distributed in the form of a concentration gradient in the real environment. The rapid diffusion of free zinc powder in zinc silicate coating was the essential reason that affected the comprehensive properties of coating. The interface thickness decreased from 7.45 to 6.82 Å, the MSD of free zinc powder was effectively reduced, and the interfacial energy was increased from 104.667 to 347.158 kcal/mol after being modified by organo-siloxane.

show abstract

Corrosion Process of Inorganic Zinc-Rich Painted Steel Exposed to a High-Chloride Atmospheric Environment

Cited by 7 publications

References 10 publications

Effect of Aluminum Flakes on Corrosion Protection Behavior of Water-Based Hybrid Zinc-Rich Coatings for Carbon Steel Substrate in NaCl Environment

Effect of Aluminum Flakes on Corrosion Protection Behavior of Water-Based Hybrid Zinc-Rich Coatings for Carbon Steel Substrate in NaCl Environment

Numerical Analysis of Corrosion Phenomena of Inorganic Zinc Primer Painted on Steel Plate

Molecular Dynamics Simulation of Interface Properties between Water-Based Inorganic Zinc Silicate Coating Modified by Organosilicone and Iron Substrate

Contact Info

Product

Resources

About