Investigations on hopeite- and phosphophyllite-containing phosphate coatings on steel

Bubert, H.; Pulm, H.; Puderbach, H.

doi:10.1007/bf01199511

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…The Zn phosphate precipitates appeared as lamella of discrete rosettes composed of square sheets/plates (Figure S5), consistent with earlier studies. , The powder X-ray diffraction pattern was consistent with hopeite [Zn 3 (PO 4 ) 2 ·4H 2 O] (Figure S6). The Zn carbonate precipitates were present as irregular aggregates with short, acicular crystals (Figure S5).…”

Section: Resultssupporting

confidence: 89%

Zinc Isotope Fractionation as an Indicator of Geochemical Attenuation Processes

Veeramani

Eagling

Jamieson-Hanes

et al. 2015

Environ. Sci. Technol. Lett.

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Section: Resultssupporting

confidence: 89%

Zinc Isotope Fractionation as an Indicator of Geochemical Attenuation Processes

Veeramani

Eagling

Jamieson-Hanes

et al. 2015

Environ. Sci. Technol. Lett.

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“…11 The application of phosphate ceramic coatings on various metals especially for ferrous substrates has been the subject of numerous studies. [17][18][19][20][21][22][23][24][25][26][27][28] The main reason of applying phosphate primers on steel is to ensure a strong adhesion between substrate surface and subsequent paints and coatings and also provision of corrosion-protective layer adjacent to metal surface. 17,22,23 In phosphating process, an insoluble corrosion-resistant phosphate layer is deposited on the metal surface to protect the substrate from corrosive species.…”

Section: Chemistry and Development Of Zincphosphate Primers On Ferroumentioning

confidence: 99%

Anticorrosive interfacial coatings for metallic substrates

Rahimi¹,

Potrekar²,

Dutta³

et al. 2013

Surface Innovations

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The present state-of-the-art in anticorrosive coatings technology is a multistep process where multilayered hybrid coatings are applied on metallic substrates with each layer having certain functionality and properties. These layers are mainly an interfacial layer, such as inorganic phosphate coatings and/or sol-gel hybrid coatings, which are accompanied by a paint/polymer topcoat. While the main characteristic of the polymer topcoat is a "barrier" role to prevent the diffusion of corrosive species to the metal surface, the primer or the first layer in contact with metal surface is of significant importance due to its role in "active" corrosion prevention capability and promotion of strong adhesion between the substrate surface and subsequent layers. In this article, recent developments in processing and functional properties of zinc-phosphate sacrificial primers and sol-gel-based hybrid coatings will be overviewed. Finally, some of the innovative advancements in this area developed by this research group and others will also be discussed.

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“…Bubert [6] descreve que os principais compostos da camada de fosfato de zinco são a hopeita e a fosfolita de fórmula molecular Zn3(PO4)2.4H20 e estrutura ortorrômbica e Zn2Fe(PO4)2.H2O e estrutura monoclínica, respectivamente. Uma camada contendo elevada presença da estrutura fosfolita é utilizada geralmente como base para a eletrodeposição de camadas de pintura, tendo como propriedade principal a alta resistência à corrosão, mas apresentando também altas performances com relação a propriedades de lubrificação.…”

Section: Introductionunclassified

Avaliação Da Influência Das Características De Superfície Nas Propriedades Do Revestimento Galvannealed

Cardoso¹,

Costa²,

Milan³

2014

ABM Proceedings

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ResumoA indústria automobilística é um dos maiores mercados para aços de aplicações de conformação criticas, exigindo contínuo desenvolvimento de novos materiais e tecnologias. Dentre estes, destaca-se o revestimento metálico (GA) que é composto por diferentes fases Fe-Zn com boas propriedades de aplicação, mas o seu comportamento em processos de conformação é sensível à fragilidade das fases intermetálicas, podendo resultar na fragmentação por powdering. A presença da fase  na superfície é prejudicial à tribologia do revestimento, pois eleva o coeficiente de atrito, a ausência desta fase pode significar transformação excessiva e maior fragilidade do revestimento, reduzindo a resistência ao powdering. A aplicação de filmes de pós-tratamento de pré-fosfatização sobre o GA, com ganhos de conformação através da redução do coeficiente de atrito, tem sido desenvolvido pela ArcelorMittal. Este trabalho objetiva avaliar a tribologia e resistência ao powdering de diferentes condições de superfície do revestimento. A evolução do coeficiente de atrito é determinada por ensaios de desgaste, além de ensaios de powdering e análises metalográficas via MEV-EDS para avaliação do pós-tratamento. Palavras-chave: Conformação; GA; Fase zeta free; Pré-fosfatização. EVALUATION OF THE SURFACE CHARACTERISTICS INFLUENCE ON THE GALVANNEALED COATING PROPERTIES AbstractThe automotive industry is one of the largest markets for steel of critical forming applications, requiring continuous development of new technologies. Among this emphasizes the GA metallic coating that is compound by different Fe-Zn phases with good properties application, but its behavior in forming is sensitive to intermetallic phases weakness, which may result in failure coating (powdering). The -Free presence on the coating surface is damaging for coating tribology, as the friction increase , the absence of this phase can means excess transformation and an increasing of the coating weakness ,minimize the powdering strength. The prephosphate treatment films on GA, with forming improvement through a friction coefficient reduction have been advanced by ArcelorMittal. This article aims to evaluate the tribology and powdering strength of different surface conditions of GA coating. The friction behavior is determined by wear tests, besides powdering tests and microstructure analysis by SEM-EDS for post-treatment evaluation.

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Investigations on hopeite- and phosphophyllite-containing phosphate coatings on steel

Cited by 9 publications

References 4 publications

Zinc Isotope Fractionation as an Indicator of Geochemical Attenuation Processes

Zinc Isotope Fractionation as an Indicator of Geochemical Attenuation Processes

Anticorrosive interfacial coatings for metallic substrates

Avaliação Da Influência Das Características De Superfície Nas Propriedades Do Revestimento Galvannealed

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