“…Pre‐treatment based on silane formulation is an emerging field as a promising technology for surface modification and corrosion protection in the steel industry . The important features of the silane pre‐treatment is the formation of a very dense self‐assembled silicon and oxygen rich network that forms a physical barrier to the penetration of electrolyte towards the metallic substrate . One major drawback with the application of silane films is their non‐passivating character towards corrosion.…”
Section: Introductionmentioning
confidence: 99%
“…The barrier properties of silane pre‐treatments containing SiO 2 nanoparticles on galvanized steel and mild steel substrates as well as aluminum alloys was investigated. Results show that the addition of silica particles improves corrosion protection due to the formation of a thicker silane film and/or enhances barrier properties provided by the inner layers of the silane film.…”
This work investigates the effect of cerium salt activated nanoparticles as nanoreservoirs on the self-healing properties of silane hybrid coatings deposited on electro-galvanized steel substrates. The substrates were pre-treated with 3-glycidoxypropyl-trimethoxysilane (GPTMS) and bisphenol A (BPA), modified with cerium ion-activated CeO2-ZrO2 and CeO2-SiO2 nanoparticles. The morphology of the coating before corrosion tests was examined using atomic force microscopy (AFM). The results indicate the formation of nanostructured surfaces with relatively uniform dispersion of nanoparticles in the silane coating containing CeO2-ZrO2 nanoparticles. The corrosion behavior of the sol-gel coatings was also investigated using salt spray tests, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization tests. During the salt spray test, the samples are exposed 600 h (or 25 days), revealing the improved resistance of the coated substrate containing CeO2-ZrO2 nanoparticles. Incorporation of activated CeO2-ZrO2 nanoparticles reduces the cathodic and anodic current density by one order of magnitude and shifts the corrosion potential to more positive values compared with the coating containing CeO2-SiO2 nanoparticles. Also, the EIS test results revealed higher impedance for the coating containing activated CeO2-ZrO2 nanoparticles. Corrosion tests results suggest that the activated CeO2-ZrO2 nanoparticles are more effective as nano-structured cerium ion reservoirs and can provide prolonged release of the inhibitor ions
“…Pre‐treatment based on silane formulation is an emerging field as a promising technology for surface modification and corrosion protection in the steel industry . The important features of the silane pre‐treatment is the formation of a very dense self‐assembled silicon and oxygen rich network that forms a physical barrier to the penetration of electrolyte towards the metallic substrate . One major drawback with the application of silane films is their non‐passivating character towards corrosion.…”
Section: Introductionmentioning
confidence: 99%
“…The barrier properties of silane pre‐treatments containing SiO 2 nanoparticles on galvanized steel and mild steel substrates as well as aluminum alloys was investigated. Results show that the addition of silica particles improves corrosion protection due to the formation of a thicker silane film and/or enhances barrier properties provided by the inner layers of the silane film.…”
This work investigates the effect of cerium salt activated nanoparticles as nanoreservoirs on the self-healing properties of silane hybrid coatings deposited on electro-galvanized steel substrates. The substrates were pre-treated with 3-glycidoxypropyl-trimethoxysilane (GPTMS) and bisphenol A (BPA), modified with cerium ion-activated CeO2-ZrO2 and CeO2-SiO2 nanoparticles. The morphology of the coating before corrosion tests was examined using atomic force microscopy (AFM). The results indicate the formation of nanostructured surfaces with relatively uniform dispersion of nanoparticles in the silane coating containing CeO2-ZrO2 nanoparticles. The corrosion behavior of the sol-gel coatings was also investigated using salt spray tests, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization tests. During the salt spray test, the samples are exposed 600 h (or 25 days), revealing the improved resistance of the coated substrate containing CeO2-ZrO2 nanoparticles. Incorporation of activated CeO2-ZrO2 nanoparticles reduces the cathodic and anodic current density by one order of magnitude and shifts the corrosion potential to more positive values compared with the coating containing CeO2-SiO2 nanoparticles. Also, the EIS test results revealed higher impedance for the coating containing activated CeO2-ZrO2 nanoparticles. Corrosion tests results suggest that the activated CeO2-ZrO2 nanoparticles are more effective as nano-structured cerium ion reservoirs and can provide prolonged release of the inhibitor ions
“…1,2 The chemistry of silanes [3][4][5] and the mechanism of interaction of these molecules with different metallic substrates such as mild steel, 6,7 aluminum and aluminum alloys, [8][9][10][11][12] galvanized steel 13,14 and stainless steels [15][16][17][18] have been widely studied. [21][22][23][24][25][26] As one of the most efficient approaches, some studies have concentrated exclusively on the curing. The barrier properties of silane coatings are due to the hydrophobic nature of the lm, the development of a dense -Si-O-Sinetwork between silanol groups and the formation of strong covalent metal-siloxane bonds (metal-O-Si).…”
In this study, the effect of curing on the structure and protective performance of an eco-friendly silane solgel coating on stainless steel 304L was investigated using electrochemical methods as well as surface analysis. The hybrid film consisting of tetraethoxysilane, methyltriethoxysilane and g-glycidyloxypropyltrimethoxysilane was applied on the substrate via a sol-gel route. The electrochemical noise data indicated that the corrosion of stainless steel in a 3.5% sodium chloride solution is more effectively prevented through application of a coating cured at a higher temperature for a longer time.According to the Fourier transform infrared spectroscopy spectra, field emission scanning electron microscopy images and water contact angle analysis, the behavior was attributed to the formation of a highly crosslinked siloxane network by increasing the curing time and temperature. Consistent with the results of electrochemical noise measurements, electrochemical impedance spectroscopy data showed the significant effect of curing time and temperature on the hybrid silane film structure. Fig. 1 Time records of electrochemical current noise for samples (a) S7 (b) S3 after 7 days of immersion in 3.5 wt% NaCl solution. 43228 | RSC Adv., 2015, 5, 43225-43233 This journal is
“…Na Com a finalidade de encontrar condições ótimas para a utilização do processo de silanização em processos industriais de pintura, vêm sendo desenvolvido vários trabalhos relacionados ao assunto, procurando sempre a otimização de certas variáveis do processo. Dentre estas variáveis temos: concentração de silano em solução e seu tempo de hidrólise [16,33], pH de hidrólise [16], tempo e temperatura de cura do filme [34], além da presença de modificantes [35][36][37][38]. O processo de inserção e retirada do substrato na solução deve ser realizado com velocidade controlada e constante e sem nenhum tipo de vibração ou interferência externa, de modo a garantir a deposição de um filme homogêneo [46,47].…”
Section: Lista De Tabelasunclassified
“…Observa-se então que o processo de desidratação do filme tem uma grande influência na formação das ligações siloxanos [43]. Trabalhos recentes do LEC-DEQ EPUSP [16,[33][34][35][36][37][38] utilizam como solvente uma solução cuja composição é de 50% de água e 50% de etanol ( m / m ), tornando dessa forma o processo menos arriscado, se aplicado na indústria.…”
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