The use of electrochemical techniques to study the corrosion behaviour of organic coatings on steel pretreated with sol–gel zirconia films

Fedrizzi, L.; Rodríguez, Francisco J.; Rossi, Stefano; Deflorian, F.; Maggio, R. Di

doi:10.1016/s0013-4686(01)00653-3

Cited by 157 publications

(63 citation statements)

References 14 publications

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“…Moreover, the thickness of the nano-Zr film is on the nanometers order [19,20]. The immersion time is an important parameter that can modify the formation of the converted coating and its microstructure.…”

Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of a Conversion Coating Based on Zirconium and Colorants on Galvanized Steel by Electrodeposition

Costa¹,

Agnoli²,

Ferreira³

2015

TMM

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Corrosion performance of Zr-based coating on substrates obtained by zinc electrodeposition in an alkaline bath is compared to chromate coatings (Cr III and Cr VI). The "nano Zr" is a conversion coating formed by immersion in a hexafluorozirconic acid solution. Since the "nano Zr" coating is transparent, the addiction of a colorant provides color to the surface. In this case, the colorant, when applied after the conversion coating, conferred the yellow color to the surface. The coating produced improves the corrosion protection of the substrate. For this study the samples were analyzed by electrochemical impedance spectroscopy (EIS) and accelerated corrosion test in a humidity chamber. The results showed similar behaviors between the "nano Zr", colorant and the chromate (Cr III) coating. Therefore this kind of conversion coating is a promising substitute for chromate coatings. Keywords: Nano Zr; Immersion process; Electrodeposited zinc; Hexafluorozirconic alkaline solution. COMPORTAMENTO DA CORROSÃO DE UM REVESTIMENTO DE CONVERSÃO À BASE DE ZIRCÔNIO E CORANTES NO AÇO ZINCADO POR ELETRODEPOSIÇÃO ResumoNo presente estudo, avaliou-se o desempenho de revestimentos à base de zircônio e corante sobre substratos de zinco obtidos por eletrodeposição em meio alcalino, em relação aos revestimentos de cromato (CrIII e CrVI). O revestimento "nano Zr" é obtido através da imersão em solução de conversão à base de ácido hexafluorzircônio. Uma vez que o revestimento "nano Zr" é transparente, a adição de um corante proporciona cor à superfície. Neste caso, o corante, quando aplicado depois do revestimento de conversão, confere cor amarela à superfície. O revestimento produzido melhora a proteção contra a corrosão do substrato. Para este estudo ensaios de espectroscopia de impedância eletroquímica (EIS) e testes em câmara úmida foram feitos. Os resultados mostraram comportamentos semelhantes entre o "Zr nano" e corante e o revestimento cromato (CrIII). Por conseguinte, este tipo de revestimento de conversão é um promissor substituto para os revestimentos de cromatização. Palavras-chave: Nano Zr; Processo de imersão; Zinco eletrodepositado; Solução ácida de hexaflúorzircônio.

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Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of a Conversion Coating Based on Zirconium and Colorants on Galvanized Steel by Electrodeposition

Costa¹,

Agnoli²,

Ferreira³

2015

TMM

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“…The main spectral feature of the samples is the broad resonance with peaks at -59 and -65 ppm, assigned to T 2 (-CH 2 Si(OSi) 2 (OR), R = H or CH 3 ) and T 3 (-CH 2 Si(OSi) 3 ) units, which are related to the polycondensation product of MPTS (Saravanamuttu et al, 1998;Tadanaga et al, 2000). Resonances related to TEOS polycondensation products are observed, at approximately -92, -102 and -109 ppm, which correspond to Q 2 (Si(OSi)2(OR)2), Q 3 (Si(OSi) 3 (OR)) and Q 4 (Si(OSi) 4 ) species, respectively (Fedrizzi at al., 2001;Saravanamuttu et al, 1998;Tadanaga et al, 2000). The absence of monomer species T 0 (-CH2Si(OR)3) and Q 0 (Si(OR) 4 ) is in agreement with the cluster-cluster condensation mechanism, which is expected under strongly acid conditions (Han at al., 2000).…”

Section: Structural Analysismentioning

confidence: 99%

Corrosion Resistant Coatings Based on Organic-Inorganic Hybrids Reinforced by Carbon Nanotubes

Hammer¹,

Santos²,

Cerrutti³

et al. 2012

Recent Researches in Corrosion Evaluation and Protection

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“…In addition, stainless steel 316L is useful in surgical implantology, for its economy in costs compared to other conventional materials such as titanium. Steel implants are considered a health problem due to the risks that their degradation entails in the body of treated patients 7,8 . The implanted steel is subjected to corrosive conditions generated by the physiological fluids of the body.…”

Section: Introductionmentioning

confidence: 99%

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

Bautista-Ruiz¹,

Aperador²,

Olaya³

2018

RJC

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In this investigation, the compound Bi24Si40O2 was synthesized via sol-gel and applied on substrates of 316L stainless steel by spin coating varying speed. In the coatings obtained, the corrosion response in simulated physiological solution was evaluated by electrochemical impedance spectroscopy and polarization potentiodynamic curves. The morphology and surface topography was studied, also, were determined the microstructure, thickness values and roughness of the coatings. The results of this study allow establishing a high degree of anticorrosive effectiveness offered by the coatings as a function of the number of layers applied to the substrate and their possible application in the biomedical industry.

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The use of electrochemical techniques to study the corrosion behaviour of organic coatings on steel pretreated with sol–gel zirconia films

Cited by 157 publications

References 14 publications

Corrosion Behavior of a Conversion Coating Based on Zirconium and Colorants on Galvanized Steel by Electrodeposition

Corrosion Behavior of a Conversion Coating Based on Zirconium and Colorants on Galvanized Steel by Electrodeposition

Corrosion Resistant Coatings Based on Organic-Inorganic Hybrids Reinforced by Carbon Nanotubes

Effect of Centrifugal Speed on the Anticorrosive Properties of Bismuth-Silicon Coatings by Sol-Gel on 316l Substrates

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