An electrochemical and mechanical approach to the corrosion resistance of cathodic electrocoatings under combined cyclic and DC polarization conditions

Esfahani, Sepehr Lajevardi; Ranjbar, Zahra; Rastegar, Saeed

doi:10.1016/j.porgcoat.2014.03.028

Cited by 14 publications

(8 citation statements)

References 26 publications

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“…Step (1)-( 3) are repeated for programmed cycles, at least 20 cycles until the loss of protective capacity is observed in procedure (1). The approximate time required for one cycle is 4-6h.The AC-DC-AC procedure was absolutely automated in Autolab PGSTAT 302N.…”

Section: Accelerated Ac-dc-ac Techniquementioning

confidence: 99%

“…However, EIS is usually used in combination with other aggressive conditions. As an evaluation method, EIS alone is not enough to screen different paints quickly [1] .…”

Section: Introductionmentioning

confidence: 99%

“…Both the impedance and relaxation of potential are recorded after each cycle of the test. Any change in the impedance spectrum can be attributed to coating deterioration (pore formation) and/or delamination at the metal/coating interface due to the generation of hydrogen gas and hydroxyl ion (if cathodic reaction takes place) [1] . This test sequence is repeated at least 6 times, which means that at least a total of 24h are required.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of anticorrosive property of epoxy phenolic coating by AC-DC-AC method

chen,

yao,

He;

et al. 2023

Preprint

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In this study, the degradation of epoxy phenolic coating used for heat resistant application is induced by AC-DC-AC method, and degradation degree evaluated by electrochemical impedance spectroscopy(EIS).Experimental results demonstrate that AC-DC-AC method did accelerate the failure of coatings. Results also showed good concordance between low frequency impedance modulus and DC current. Moreover, characterization of parameters, such as polarization potential, duration, and coating thickness with respect to the electrochemical behavior of coating are proposed.

show abstract

Section: Accelerated Ac-dc-ac Techniquementioning

confidence: 99%

“…However, EIS is usually used in combination with other aggressive conditions. As an evaluation method, EIS alone is not enough to screen different paints quickly [1] .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of anticorrosive property of epoxy phenolic coating by AC-DC-AC method

chen,

yao,

He;

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The AC-DC-AC testing method has been applied to rapidly assess the corrosion protection of different types of organic coatings, oxide films, and coatings with different formulations and preparation procedures [14,18,[25][26][27][28][29][30][31]. Some modifications on this accelerated testing method have also been carried out [32][33][34][35][36]. With replacing the DC step by an alternate cathodic polarization and anodic polarization during the AC-DC-AC test, the corrosion damage of a steel sample with an organic coating can be further accelerated with enhancing both cathodic and anodic processes in the same way as that in natural immersion conditions [33,34].…”

Section: Introductionmentioning

confidence: 99%

Influence of AC-DC-AC Cycling with Hydrostatic Pressure on Accelerated Protective Performance Test of Glass Flake Epoxy Coating

Shen,

Xu,

Liu

et al. 2023

Coatings

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To achieve fast testing of the barrier properties of organic coatings, immersion tests, AC-DC-AC tests, and coupled tests of AC-DC-AC with hydrostatic pressure were conducted in seawater for a glass flake epoxy coating. Electrochemical impedance spectroscopy (EIS) was used to characterize the degradation processes of the coating during the tests, and the surface of the coating was analyzed using an optical microscope, scanning electron microscope (SEM), and a Fourier transform infrared spectrometer (FTIR). The results showed that periodic cathodic polarization coupled with high hydrostatic pressure can accelerate the degradation of a coating by facilitating the diffusion and uptake of electrolyte and the delamination of the coating. The coupled test method has the largest acceleration due to the synergetic effect of AC-DC-AC and hydrostatic pressure.

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“…Lajevardi Esfahani and co-workers 34 introduced a modified ac/dc/ac accelerated test applied to cathodically electrocoated mild steel substrates baked at different conditions. This study aimed at characterising the protective behaviour of under-, normal- and over-baked electrocoatings under cyclic corrosion conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of corrosion protection of normal and galvanised steel coated by cathodic electrocoatings using EIS and salt spray tests

Esfahani

Ranjbar

Rastegar

2016

Corrosion Engineering, Science and Technology

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Cathodic electrocoatings were applied onto phosphated normal and galvanised steel substrates with average dry film thicknesses of 20 and 12 mm. To evaluate the anticorrosion properties of the coatings, electrochemical impedance spectroscopy and salt spray tests were carried out on the samples. The results showed that, by increasing the curing temperature, the protective properties of electrocoated galvanised steel are improved to a higher extent compared to normal steel panels. This was indicated by a pore resistance of two orders of magnitude higher in the case of galvanised steel panels. At lower curing temperatures, the corrosion resistance of electrocoated normal steel panels is better than that of the galvanised steel, indicated by a two orders of magnitude higher pore resistance value. On the other side, the salt spray test could not recognise the difference between protective properties of different coating films on galvanised steel suitably, and this is one of the notable disadvantages of this test.

show abstract

An electrochemical and mechanical approach to the corrosion resistance of cathodic electrocoatings under combined cyclic and DC polarization conditions

Cited by 14 publications

References 26 publications

Investigation of anticorrosive property of epoxy phenolic coating by AC-DC-AC method

Investigation of anticorrosive property of epoxy phenolic coating by AC-DC-AC method

Influence of AC-DC-AC Cycling with Hydrostatic Pressure on Accelerated Protective Performance Test of Glass Flake Epoxy Coating

Comparison of corrosion protection of normal and galvanised steel coated by cathodic electrocoatings using EIS and salt spray tests

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