Electrochemical test methods for evaluating organic coatings on metals: an update. Part III: Multiple test parameter measurements

Murray, John N.

doi:10.1016/s0300-9440(97)00099-4

Cited by 130 publications

(35 citation statements)

References 129 publications

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“…The impedance data (0.001-10,000 Hz, 100 mV amplitude of sinusoidal voltage vs. OCP) were collected using EIS300 software with FAS2 femtostat (Gamry) and analyzed using the electric circuit model presented in Fig. 1 (R u -uncompensated solution resistance, R p -pore resistance, C c -coating capacitance 24 ). The pore resistance and coating capacitance parameters were calculated in respect to the coating thickness and presented as relative R p (i.e., R pr , X/lm) and relative C c (C cr , F/lm) with standard deviations.…”

Section: Characterization Of the Paints And Cured Coatingsmentioning

confidence: 99%

Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions

2018

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Anticorrosive polyurethane coating compositions were compounded using novel zinc-free nanosized phosphates: aluminum ammonium phosphates (AAP) or calcium aluminum ammonium phosphates (CAAP). For comparison, a nanosized strontium phosphate (SP), AAP/SP mixtures, and a microsized zinc phosphate (ZP) were tested. Paints containing ammonium-modified phosphates exhibited similar or a slightly higher viscosity than systems with SP or ZP. Nevertheless, coatings with the AAP or CAAP reached significantly better gloss and adhesion to a steel substrate as well as a slightly higher hardness. Results of a salt spray test showed that anticorrosive properties of the coatings containing AAP/SP mixtures were markedly better in relation to the systems containing solely AAP, CAAP, SP, or ZP. Electrochemical tests revealed the best barrier/anticorrosive features for AAP (electrochemical impedance spectroscopy and potentiodynamic polarization) or SP and CAAP (a novel electrochemical noise technique).

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Section: Characterization Of the Paints And Cured Coatingsmentioning

confidence: 99%

Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions

2018

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“…Apart from DC resistance (which has advantages of being very simple to conduct) other methods such as EIS, ENM as well as C.I. (Current Interrupter technique) can be used to obtain the R values that are proven to be close to R 0.1 Hz [31,32]. Note that if the paint film is protecting the metal substrate effectively, the "R" is normally dominated by the ionic resistance of coating.…”

Section: Electrochemical Testingmentioning

confidence: 99%

The best tests for anti-corrosive paints. And why: A personal viewpoint

Mills

Jamali

2017

Progress in Organic Coatings

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This paper starts by putting forward a mechanism for the way that anti-corrosive paints work. This draws on previous work on understanding of mechanism but puts stronger emphasis on the maintenance of the oxide film of the metal under the paint as the essential feature. If this mechanism is corect then it suggests various properties which a paint coating should have. In many cases a minimum value of these properties is all that is required. In some cases eg DC resistance, it is advantageous to have as high as possible value of this property at the start due to degradation with time. The paper then details a series of tests, chosen by the authors for their relative simplicity, to measure these properties in a quantitative manner and hence to assist in formulation of new or better coatings. These tests are the personal selection of the authors and we admit that others may make different choices. They have been divided into those best conducted on the free paint film and those which are conducted on the metal and paint together , the latter including one test to be conducted on the metal alone. Among the second group, suggestions have been made for electrochemical tests which are non-destructive and can thus be used for quality control and monitoring. There is a brief discussion of accelerated tests with the emphasis again on quantitative non-destructive assessment methods. Numerous pertinent references are provided. The papers concludes with suggestions for future work.

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“…1 (R u -uncompensated solution resistance, R p -pore resistance, R f -polarization resistance, C c -coating capacitance, C f -double layer capacitance). 21 The pore resistance, polarization resistance, and coating capacitance parameters were calculated with respect to the coat thickness and presented as relative R p and R f (i.e., R pr and R fr , X/lm) and relative C c (C cr , F/lm) with a standard deviation.…”

Section: Characterization Of Coating Compositions and Cured Paintsmentioning

confidence: 99%

Preparation and characterization of anticorrosion polyurethane paints and coatings based on novel Zn-free phosphates

2014

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Novel aluminum ammonium phosphates (AAP) were tested as anticorrosion fillers in twocomponent solventborne polyurethane paints. Their properties were compared with microsized aluminum zinc phosphate (AZP) as well as with nanosized (nAP) and microsized (AP) aluminum phosphates. Generally, coating compositions containing AAP exhibited similar or slightly higher viscosity than the systems with AZP and AP. Moreover, cured polyurethane coats with AAP reached higher gloss and better adhesion to a steel substrate. The results of salt spray tests (2500 h) showed that anticorrosive properties of coats containing 10 wt% of AAP were similar or better than those noted for coats with 15.6 wt% of AZP or 13.7 wt% of AP. Electrochemical impedance spectroscopic tests revealed markedly higher barrier properties of coats with AAP in comparison to an AP-based sample.

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Electrochemical test methods for evaluating organic coatings on metals: an update. Part III: Multiple test parameter measurements

Cited by 130 publications

References 129 publications

Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions

Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions

The best tests for anti-corrosive paints. And why: A personal viewpoint

Preparation and characterization of anticorrosion polyurethane paints and coatings based on novel Zn-free phosphates

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