Use of waste foundry sand (WFS) to produce protective coatings on aluminum alloy by plasma electrolytic oxidation

Souza, Carime dos Santos; Antunes, Maria Lúcia Pereira; Valentina, Luiz Veriano Oliveira Dalla; Rangel, Elidiane Cipriano; Cruz, Nilson Cristino da

doi:10.1016/j.jclepro.2019.03.013

Cited by 13 publications

(5 citation statements)

References 21 publications

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“…The elements identified were silicon (Si) from quartz sand, in the form of aluminum silicate (Al), magnesium (Mg) and calcium (Ca) from bentonite clay and lastly, carbon and oxygen originated from coal and iron (Fe) during the smelting process. This result is close to that found in [ 37 ], who identified 52.33% of oxygen, 15.53% of silicon, 12.76% of aluminum, and 3.8% of iron, among other elements…”

Section: Resultssupporting

confidence: 92%

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Physical and Chemical Properties of Waste Foundry Exhaust Sand for Use in Self-Compacting Concrete

et al. 2021

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The reuse of waste in civil construction brings environmental and economic benefits. However, for these to be used in concrete, it is necessary a previous evaluation of their physical and chemical characteristics. Thus, this study aimed to characterize and analyze the waste foundry exhaust sand (WFES) for use in self-compacting concrete (SCC). Foundry exhaust sand originates from the manufacturing process of sand molds and during demolding of metal parts. It is a fine sand rich in silica in the form of quartz collected by baghouse filter. Characterization of WFES was conducted through laser granulometry, scanning electron microscopy (SEM) in the energy dispersive spectroscopy (EDS) mode, X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG) and derivative thermogravimetry (DTG) techniques. The waste was classified as non-hazardous and non-inert, with physical and chemical properties suitable for use in SCC composition, as fine aggregate or mineral addition. Five mixtures of SCC were developed, in order to determine the waste influence in both fresh and hardened concrete. The properties in the fresh state were reached. There was an increase in compressive strength and sulfate resistance, a decrease in water absorption of self-compacting concrete by incorporating WFES as 30% replacement.

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Section: Resultssupporting

confidence: 92%

“…Souza et al [ 37 ] evaluated the possibility of using smelting exhaust powder to produce protective aluminum alloy coatings. X-ray fluorescence (XRF), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) characterized the waste.…”

Section: Introductionmentioning

confidence: 99%

Physical and Chemical Properties of Waste Foundry Exhaust Sand for Use in Self-Compacting Concrete

et al. 2021

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“…Alekseev et al (2019) desenvolveram novos compostos cerâmicos ecológicos, a partir da lama vermelha, bauxita e AF, buscando reduzir a quantidade de resíduos, e obter cerâmicas favoráveis ao meio ambiente, com boas propriedades físicas. Souza et al (2019) avaliaram o emprego do subproduto AF para produzir revestimentos com materiais de proteção em liga de alumínio por oxidação eletrolítica no plasma.…”

Section: Resultsunclassified

Caracterização de resíduos do processo de fundição: um olhar sustentável

Bueno

Tonial

2021

Environmental Scientiae

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A indústria de fundição possui grande importância econômica e ambiental, porém, apesar do potencial de reciclagem, gera resíduos sólidos, como escória, areia de fundição e pó de ferro. Poucos estudos na literatura abordam sua caracterização e reaproveitamento, apesar de seu potencial de reaproveitamento. Nesse sentido, este trabalho tem como objetivo determinar as características físico-químicas, e a partir destas sugerir e incentivar o reaproveitamento dos resíduos do processo de fundição. Na caracterização da escória, areia de fundição e pó de ferro, foram determinados os teores de cinzas, carbono e nitrogênio total, comportamento magnético, granulometria e foi obtido o difractograma de raios-X dos resíduos. Os resultados sugerem resíduos sólidos como subprodutos para outras indústrias, evidenciando o grande potencial para o desenvolvimento sustentável. No entanto, reforçam a necessidade de mais estudos sobre sua caracterização, e reforçam a necessidade de uma avaliação contínua devido à variabilidade da matéria-prima.

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“…The WFS was collected from the exhaust system of a foundry and was used without any prior treatment. The chemical compositions of these waste samples were determined previously (Souza et al 2019) and are summarized in Table 1. The WFS consisted mainly of silicon oxide, which accounted for over 80% of the mass, followed by aluminum and iron oxides.…”

Section: Collection and Characterization Of The Wastesmentioning

confidence: 99%

“…It has been shown that these ceramic coatings can be produced on materials such as aluminum alloys, titanium, and carbon steel, among others (Lu et al 2016), using these substrates in an electrolytic solution, hence providing them with new properties and applications. Recent studies have shown that it is possible to incorporate silicon-rich wastes in the electrolytic solution, resulting in the formation of good quality ceramic coatings on aluminum (Sottovia et al 2014, Souza et al 2019. This work compares the coatings obtained using red mud and WFS at concentrations of 10 g/L in the electrolytic solution.…”

Section: Introductionmentioning

confidence: 99%

Use of Industrial Waste to Produce Ceramic Coatings on Metal

Antunes¹,

Souza²,

Moraes³

et al. 2019

EJSD

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Industrial processes are activities that produce large amounts of wastes. Often these wastes are disposed in dam or landfills, occupying large areas and causing environmental damage such as the contamination of water and soil. According to the Circular Economy concept, waste should be minimized and reused as raw material in a new process. This work describes two residues, namely red mud (bauxite residue) and waste foundry sand (WFS), whose chemical compositions indicate their suitability for use as protective coatings. These residues were used to obtain coatings on aluminum alloy by employing plasma electrolytic oxidation (PEO). The PEO process enables the creation of coatings that are durable, uniform, and strongly adherent on metallic components of different shapes. The mineralogical compositions of the coatings were investigated using X-ray diffraction (XRD). Surface wettability was determined by contact angle measurements and evaluation was made of the average surface roughness. Alumina was the main phase observed by XR, indicating good chemical stability and high thermal resistance. The coatings obtained with the red mud were thicker and less rough, compared to those obtained with the WFS. The results demonstrated the feasibility of using these wastes for coating metals in order to improve their properties and enable new applications. Keywords: Industrial Waste, Red Mud, Waste Foundry Sand, Circular Economy, Ceramic Coating.

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Use of waste foundry sand (WFS) to produce protective coatings on aluminum alloy by plasma electrolytic oxidation

Cited by 13 publications

References 21 publications

Physical and Chemical Properties of Waste Foundry Exhaust Sand for Use in Self-Compacting Concrete

Physical and Chemical Properties of Waste Foundry Exhaust Sand for Use in Self-Compacting Concrete

Caracterização de resíduos do processo de fundição: um olhar sustentável

Use of Industrial Waste to Produce Ceramic Coatings on Metal

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