Testing Organic Architectural Coatings in ASTM Synthetic Seawater Immersion Conditions Using EIS

Murray, John N.; Hack, HP

doi:10.5006/1.3315988

Cited by 47 publications

(7 citation statements)

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“…al, 4) the impedance at the lowest frequency was used to evaluate the corrosion protection performance at the defect and intact sites. Similar studies by Scully 6) and Murray 7) found that the low frequency impedance of 10mHz provide the most useful parameter in assessing the performance of coating systems. In this study, microcell corrosion current, calculated from the low frequency impedance of 10mHz, and macrocell corrosion current that flows between the defect and sound portions were measured using zero resistance ammeters and used to evaluate the corrosion behavior in coated steel plates with impact defect.…”

Section: Introductionsupporting

confidence: 52%

Corrosion Behavior of Coated Steel Plates with Defects Exposed to Marine Environment

Madlangbayan¹,

Otsuki²,

Saito³

et al. 2009

J. Soc. Mat. Sci., Japan

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Section: Introductionsupporting

confidence: 52%

Corrosion Behavior of Coated Steel Plates with Defects Exposed to Marine Environment

Madlangbayan¹,

Otsuki²,

Saito³

et al. 2009

J. Soc. Mat. Sci., Japan

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“…2b) associated with the first time constant (coating resistance). A general quantitative range for a good coating was shown to be >10 8 ohm.cm 2 [25]; in the present study it can be said that the compounds nylon/H2T(p-NH2)PP and nylon/GO with ≈10 9 ohm.cm 2 values have good properties as an anticorrosive coating barrier for stainless steel in an acid environment. After no significant change was detected with increasing concentration of GO from 25% to 50%,it was decided to use 25% of GO and only vary the concentration of 5 mg to 100 mg of H2T(p-NH2)PP as well as electrospinning time from 5 minutes, to 1 and 2 hours.…”

Section: Characterization By Eis Of Nylon/h2t(p-nh2)pp Compoundmentioning

confidence: 86%

Transport of Protons and Capacitive Properties of the Nylon/Porphyrin/Graphene Oxide Coating

Ca¹,

Menchaca‐Campos²,

Ma³

et al. 2017

Preprint

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Electrochemical impedance (EI) measurements were performed to evaluate the nylon 66/-tetra-(para-aminophenyl) porphyrin (H2T(p-NH2)PP)/graphene oxide (GO) film coating on stainless steel and compared to the nylon/H2T(p-NH2)PP and nylon/GO film samples using 1M H2SO4 as electrolyte. The nylon/H2T(p-NH2)PP and nylon/GO composite films showed high electrochemical impedance in the order of 10 9 ohm-cm 2 and a system controlled by mass transfer, product of a diffusion process at low frequencies with a resistance up to 5 orders of magnitude, indicating the diffusion of protons through the coating and a decrease in the metal dissolution. Otherwise, the nylon/H2T(p-NH2)PP/GO film compound evaluated show good ionic conductivity and electrochemical stability in the acid environment, acting porphyrin as a catalyst to the passage of protons through the film, reducing its electrochemical impedance up to 7 orders of magnitude with respect to the compounds nylon/H2T(p-NH2)PP and nylon/GO. Likewise, good capacitance values are also shown by modifying the concentrations of porphyrin and GO reinforcing materials. These properties are important for technological applications, such as anticorrosion coating for bipolar plates or membrane in a fuel cell type PEM, super-capacitors, etc.

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“…Also, as expected from the polarisation data, the diameter of the frequency loop tends to increase with increased inhibitor concentration, which is also in agreement with previous work. 10,11 As the exposure time was increased, the mild steel electrode inhibited by the lowest concentration (10 ppm) showed an increase of the charge transfer resistance from 965 V cm 2 in the first 15 min to 5 . 11 kV cm 2 at the end of 3 days, to a pure capacitive line after 7 days of immersion (Fig.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Inhibition of mild steel by strontium chromate in artificial acid rain solution

I.M.Baghni¹,

Lyon²

2005

Corrosion Engineering, Science and Technology

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The inhibition of mild steel in an artificial acid rain solution (pH 4 . 5) in low concentrations of strontium chromate pigment has been evaluated using a range of methods: potentiodynamic polarisation, electrochemical impedance, X-ray photoelectron spectroscopy and solution analysis. The individual effects of strontium and chromate have been evaluated and have been used to estimate inhibitor efficiency and film composition, and to determine the possible inhibition mechanism. The results show that, at low concentration, strontium chromate affects the cathodic reaction, with reduction of Cr 6z to Cr 3z , and the surface film was composed of magnetite and hydrated chromium hydroxide. The presence of strontium was not found significantly to affect the inhibitory performance.

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Testing Organic Architectural Coatings in ASTM Synthetic Seawater Immersion Conditions Using EIS

Cited by 47 publications

References 0 publications

Corrosion Behavior of Coated Steel Plates with Defects Exposed to Marine Environment

Corrosion Behavior of Coated Steel Plates with Defects Exposed to Marine Environment

Transport of Protons and Capacitive Properties of the Nylon/Porphyrin/Graphene Oxide Coating

Inhibition of mild steel by strontium chromate in artificial acid rain solution

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