Steel cathodic protection afforded by zinc, aluminium and zinc/aluminium alloy coatings in the atmosphere

Panossian, Zehbour; Mariaca, L.; Morcillo, M.; Flores, Santiago; Rocha, James; Peña, J. J.; Herrera, Francisco; Corvo, Francisco; Sánchez, M.; Rincón, Oladis Troconis de; Pridybailo, G.; Simancas, J.

doi:10.1016/j.surfcoat.2004.04.023

Cited by 115 publications

(42 citation statements)

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“…TLR (thickness loss rate), for the alloy with 5% aluminium, is significantly lower than the rest of coatings in Zn (never higher than 15 µm). Other research works (Panossian et al, 2005), arrived to similar conclusions, confirming that coatings based on zinc or zinc alloys with a high aluminium content (above 15%), only provide effective cathodic protection against corrosion, in atmospheres with a high concentration level of chlorine ions, while alloys with high zinc content, the cathodic protection acts from the beginning in all cases. b) Galvatech 2011 (Schouller-Guinnet et al, 2011;Thierry et al, 2011).…”

Section: Just Aluminiumsupporting

confidence: 66%

Revisión y análisis de la corrosión a largo plazo de recubrimientos basados en aleaciones de Zinc-Aluminio-Magnesio, como alternativa a los recubrimientos tradicionales basados en cinc, para canalizaciones eléctricas

2019

NOVASINERGIA

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Se presenta una revisión del estado del arte en lo que se refiere a recubrimientos metálicos basados en aleaciones de cinc-aluminio-magnesio, para la protección frente a la corrosión, de sistemas metálicos de canalización eléctrica, como alternativa a los tradicionales recubrimientos metálicos basados en cinc. Esta revisión contempla su evolución en el tiempo, las distintas calidades y designaciones existentes en el mercado, su estructura y composición, la normativa internacional que los regula, las principales marcas comercializadas y sus características, los principales fabricantes de canalización eléctrica que ofrecen dichas aleaciones, y finalmente, un análisis de la resistencia a la corrosión sobre la base de ensayos de campo y ensayos de corrosión acelerada, los cuales han formado igualmente parte de esta investigación. A partir de dicho análisis, se ha determinado un modelo matemático para la estimación de la corrosión a largo plazo, en el que se evidencia el comportamiento logarítmico de la función corrosión-tiempo. Con todo y con ello, el artículo pretende, por una parte, ser un compendio de los aspectos clave a considerar en este tipo de aleaciones y por otra, dar soporte al ingeniero de proyectos en la toma de decisión, que supone la elección de este tipo de recubrimiento frente a los recubrimientos basados en zinc, proporcionándole los aspectos más relevantes a considerar, de tal forma que se asegure el cumplimiento de las especificaciones del proyecto en lo que a resistencia a la corrosión se refiere.

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Section: Just Aluminiumsupporting

confidence: 66%

Revisión y análisis de la corrosión a largo plazo de recubrimientos basados en aleaciones de Zinc-Aluminio-Magnesio, como alternativa a los recubrimientos tradicionales basados en cinc, para canalizaciones eléctricas

2019

NOVASINERGIA

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“…sputtering [4,5] and CVD [6,7], or by high temperature processing, e.g. thermal spraying [8,9] and hot dipping [10,11].…”

Section: Regarding the Deposition Section (Second Half Of Page 13): Tmentioning

confidence: 99%

Aluminium electrodeposition from a novel hydrophobic ionic liquid tetramethyl guanidinium-perfluoro-3-oxa-4,5 dichloro-pentan-sulphonate

Oriani

Cojocaru

Monzani

et al. 2017

Journal of Electroanalytical Chemistry

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Manuscript Region of Origin: SPAIN Reviewers' comments:Reviewer #1: This manuscript reports interesting results about the electrodeposition of aluminium using tetramethyl guanidium -perfluoro -3 -oxa-4,5 dichloro-pentansulphonate, a novel hydrophobic ionic liquid, which is synthesized and supplied by Solvay Specialty Polymers. The effect of temperature, aluminium and bistrifluoromethanesulfonimide lithium salt concentration, in the conductivity and electrochemical behavior of the electrolyte is evaluated and clearly discussed. However, the manuscript needs some improvements before acceptance for publication. My detailed comments are as follows:At first the authors want to acknowledge the reviewer for the fruitful comment and then we tried to answer the questions The objective of this paragraph was encourage the use of the electrodeposition for the preparation of deposits. At no time it was intended to give the impression that aluminum electrodeposition from IL was used for the first time. The paragraph has been rewritten and the suggested references included and consequently reordered. 2.Introduction section (Page 3), the phrase "Aluminium has a low reduction potential", is contrary to that reported in literature. In fact, because of the rather negative standard potential of Al, electrodeposition of Al from aqueous solutions is not possible due to hydrogen evolution at the cathode (Ref. 12 in the manuscript).The words "low reduction" was used as synonym of "very negative" potential. In the new version in order to avoid misunderstandings between potential and overpotential, the phase contains "very negative standard potential". 3.Page 10, just before the last paragraph, the authors comment that the voltammograms of Fig. 4B show the onset of reduction current at higher potentials if the aluminium content is increased. I suggest changing "higher potentials" for "more positive potentials" to avoid confusions.According to the suggestion and in order to clarify the text, in this paragraph and others the "higher/lower" comparative were substituted by "more positive/more negative" in order to avoid confusions. 4.Page 11, in the discussion of the voltammetric curves obtained in the absence and presence of LiTFSI (Fig. 7), the authors comment that LiTFSI favours the aluminium deposition process, only based in the appearance of the reduction onset at Response to Reviews Aluminium electrodeposition from a novel hydrophobic ionic liquid tetramethyl guanidium -perfluoro-3-oxa-4,5 dichloro-pentan-sulphonate

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“…To this end many attempts to assess the degradation experienced in aqueous and atmospheric [3] environments over different timescales are made. Scanning electrochemical techniques [4] and impedance spectroscopy [5] are often employed in order to predict the degradation of a Zn alloy coating in an aggressive chloride-containing electrolyte in order to elucidate the corrosion behaviour in the service environment.…”

Section: Introductionmentioning

confidence: 99%

Micro-scale computer modelling of the relationship between metallurgical microstructure and localized corrosion effects

Brown¹,

Barnard²

2007

WIT Transactions on Engineering Sciences, Vol 54

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An attempt is made to model the corrosion effects experienced by zinc and zinc-aluminium coating alloys in contact with conductive, chloride containing aqueous electrolytes. 3D predictions of localized corrosion of zinc alloy coatings are made using a control-volume finite difference approach, where an irregular structured mesh is employed. The model deals with the movement of multiple evolving conserved concentration fields. Perturbations in concentration are used to determine the conditions at an exposed surface, in addition to influencing any processes operating. The effect of coupled-materials and electrolyte present on the progression of localized corrosion processes is calculated using established relationships and experimentally derived data.Quantitative predictions of the corrosion performance at the exposed surface and cut-edge to electrolyte (used in the accelerated corrosion testing of these coating alloys) are made. Comparison is made to the predicted form of the current density fields around corroding surfaces and those observed experimentally. In addition, absolute metal losses calculated across exposed areas of the simulated alloys are compared with those estimated during experimental investigations.

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Steel cathodic protection afforded by zinc, aluminium and zinc/aluminium alloy coatings in the atmosphere

Cited by 115 publications

References 1 publication

Revisión y análisis de la corrosión a largo plazo de recubrimientos basados en aleaciones de Zinc-Aluminio-Magnesio, como alternativa a los recubrimientos tradicionales basados en cinc, para canalizaciones eléctricas

Revisión y análisis de la corrosión a largo plazo de recubrimientos basados en aleaciones de Zinc-Aluminio-Magnesio, como alternativa a los recubrimientos tradicionales basados en cinc, para canalizaciones eléctricas

Aluminium electrodeposition from a novel hydrophobic ionic liquid tetramethyl guanidinium-perfluoro-3-oxa-4,5 dichloro-pentan-sulphonate

Micro-scale computer modelling of the relationship between metallurgical microstructure and localized corrosion effects

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