The use of electrochemical impedance spectroscopy with segmented electrodes to study inhibition at the cut-edge of coil-coated systems

Farren, Lee A.; Francis, Danny; Lyon, S.B.

doi:10.1016/j.porgcoat.2016.03.029

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…Anodic and cathodic inhibition was evaluated by comparison of the charge transfer resistance values obtained through fitting the equivalent circuit to the impedance plots, Fig. 1 3 . It can be seen that inhibition occurs immediately (within 1 hour) at the steel cathode, whereas differences between the charge transfer resistance at the uninhibited and inhibited zinc anode were minor and relatively delayed.…”

Section: Resultsmentioning

confidence: 99%

“…Typically for this class of inhibitor, SAPP was found to be sparingly soluble; measurements were obtained from saturated solutions containing < 50 ppm SAPP by weight when dissolved into 3.5 wt % NaCl electrolyte. A four-electrode cell was used and attached to an ACM Gill AC Weld Tester instrument, utilising the steel and zinc as two working electrodes, a saturated calomel reference electrode and a platinum counter electrode, as described in detail previously 3 . Impedance measurements were taken at the measured system coupled potential in the frequency range of 10,000 to 0.01 Hz with a signal amplitude of 10 mV.…”

Section: Methodsmentioning

confidence: 99%

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The Unexpected Role of Carbonate Impurities in Polyphosphate Corrosion Inhibition

Morsch

Emad

Farren

et al. 2018

Sci Rep

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Polyphosphate corrosion inhibitors are increasingly marketed as chromate replacements for coil coated steel. The mechanisms underpinning corrosion prevention by these species is, however, not fully understood; corrosion inhibition is ordinarily assessed using electrochemical techniques, followed by ex-situ surface analysis. As a result, the formation of a clear film over cathodic sites is known to contribute to corrosion prevention, but little is known about its formation. Here, we apply advanced microscopy techniques (in-situ fluid cell AFM, SEM-EDX, and AFM-IR nano-chemical analysis) to examine early cathodic film formation by strontium aluminium polyphosphate (SAPP) in detail. For a model cut edge system, it is found that cathodic inhibition dominates during the first 24 hours of immersion, and surprisingly, that strontium carbonate impurities play a significant role. Rapidly precipitated zinc carbonate provides protection almost immediately after immersion, before the film structure evolves to include (poly)phosphate species. This suggests that the purposeful inclusion of carbonates may provide a new, environmentally sound approach to enhancing inhibitor efficacy.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The Unexpected Role of Carbonate Impurities in Polyphosphate Corrosion Inhibition

Morsch

Emad

Farren

et al. 2018

Sci Rep

Self Cite

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“…Further increase in temperature to 333 K rapidly reduced the efficiency to a negative value. Negative inhibition efficiency has also been observed for other inhibitors at high temperatures, e.g., Combretum bracteosum [49], magnesium aluminum polyphosphate [51], Glutmatic acid [52], and Oxyanion Esters of Α-Hydroxy Acids [53]. A negative inhibition efficiency could be caused by the deterioration of inhibitor molecules at high temperatures and formation of adsorbed intermediates that are less protective [42,49,54,55].…”

Section: Effect Of Temperaturementioning

confidence: 97%

Pomegranate arils extract as a green corrosion inhibitor for mild steel: effect of concentration and temperature in hydrochloric acid

Shahsavari¹,

Imani²,

Asselin³

2022

Mater. Res. Express

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Corrosion inhibitors generated from plants and organic compounds are critical for achieving a greener environment. In this work we investigated the corrosion inhibition of pomegranate arils extract (PAE) for mild steel in 1M HCl by potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), and profilometry measurements. The effects of PAE concentration (100, 200, 400 mg L–1) and temperature (298, 313, and 333 K) on the PAE inhibition efficiency were evaluated. Polarization measurements revealed that PAE was a mixed anodic-cathodic inhibitor. Corrosion inhibition efficiency was around 74% at a PAE concentration of 400 mg L–1 at 298K. However, at 333 K, the corrosion current density in the solution containing 400 mg L–1 of PAE was measured to be 1.28 mA cm-2, which was higher than that in the blank solution (0.92 mA cm-2). This increase in corrosion rate at 333 K demonstrates the negative influence of high temperatures on PAE inhibition efficiency. The PAE green inhibitor was discovered to have a physical adsorption characteristic and to obey the Langmuir adsorption isotherm.

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Corrosion behaviour of galvanized steel studied by electrochemical microprobes applied on low-angle cross sections

Manhabosco¹,

Manhabosco²,

Geoffroy³

et al. 2018

Corrosion Science

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The use of electrochemical impedance spectroscopy with segmented electrodes to study inhibition at the cut-edge of coil-coated systems

Cited by 4 publications

References 10 publications

The Unexpected Role of Carbonate Impurities in Polyphosphate Corrosion Inhibition

The Unexpected Role of Carbonate Impurities in Polyphosphate Corrosion Inhibition

Pomegranate arils extract as a green corrosion inhibitor for mild steel: effect of concentration and temperature in hydrochloric acid

Corrosion behaviour of galvanized steel studied by electrochemical microprobes applied on low-angle cross sections

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