The use of pre-treatments based on doped silane solutions for improved corrosion resistance of galvanised steel substrates

Trabelsi, Wassim; Triki, E.; Dhouibi, L.; Ferreira, M.G.S.; Zheludkevich, Mikhail L.; Montemor, M.F.

doi:10.1016/j.surfcoat.2005.01.044

Cited by 167 publications

(90 citation statements)

References 35 publications

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“…In these two equivalent circuits, R s is the resistance of the electrolyte, R f is the resistance of the pore at the coating surface, and CPE f is a constant phase element to represent the capacitance of the electrical double layer on the surface of the coating. CPE is generally attributed to the distributed surface reactivity, roughness, electrode porosity, and current and potential distributions associated with the electrode geometry; therefore, here we use a CPE f rather than an ideal capacitor [29]. R ct and CPE dl are used to represent the metal/electrolyte interface.…”

Section: Electrochemical Testsmentioning

confidence: 99%

Realization of Graphene on the Surface of Electroless Ni–P Coating for Short-Term Corrosion Prevention

Wang

et al. 2018

Coatings

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Abstract:Graphene was first fabricated on the surface of an electroless Ni-P coating/carbon steel (Ni-P-G) to improve its corrosion resistance. Meanwhile, an electroless Ni-P coating (Ni-P) was heated (Ni-P-H) under the same condition as Ni-P-G for comparison. The morphological results showed that a wavy multilayer graphene was formed on the surface of Ni-P-G. The layer number of the graphene film was 5-10 according to the analysis of Raman spectra and observation by a high-resolution transmission electron microscope. The I D /I G ratio calculated from the Raman spectrum revealed that the graphene growing at the grain of Ni-P-H had larger grain size than that growing at the grain boundary. The electrochemical results showed a higher R p , a lower CPE dl , and a lower corrosion rate of Ni-P-G than Q235 steel, Ni-P, and Ni-P-H, indicating a higher corrosion resistance. In addition, the surface potential map achieved by a scanning Kelvin probe presented a more positive surface potential of Ni-P-G than Ni-P with the difference being around 375-750 mV, demonstrating a lower corrosion tendency of Ni-P-G.

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Section: Electrochemical Testsmentioning

confidence: 99%

Realization of Graphene on the Surface of Electroless Ni–P Coating for Short-Term Corrosion Prevention

Wang

et al. 2018

Coatings

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“…Information related to coatings morphology after the coating/drying process is very important since the presence of flaws such as pores and/or other defects could be areas were a localized corrosion of the treated zinc surface starts from its exposure to a given environment [19,[69][70][71][72][73][74][75][76][77][78][79][80][81]. The coatings surface morphology was observed at up to a maximum of 10,000X by SEM.…”

Section: Conversion Layer Characterizationmentioning

confidence: 99%

Characterization and Corrosion Resistance of Galvanized Steel/Passivation Composite/ Polyurethane Paint Systems

Sarli¹,

Elsner²,

Tomachuk³

2014

BJAST

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The corrosion performance of electrogalvanised steel sheets pre-treated with a Cr 3+ or Cr +6 -based conversion layer and then covered with polyurethane-waterborne topcoat paint has been studied. The pre-treated metallic panels were coated with one of the three tested polyurethane (PU) topcoat paints, in which the dispersion type was the formulation variable. The pigment was TiO 2 (rutile) with a PVC value of 10. Before and after the immersion in 0.05 M NaCl (pH 5.70) or 0.1 M Na 2 SO 4 (pH 6.36) solutions, replicates of the different samples were subjected to standardized tests (porosity, gloss and color, hardness, flexibility). During the immersion, blistering and rusting degrees were evaluated through periodical visual inspections, while the coated steel performance was monitored by Electrochemical Impedance Spectroscopy (EIS) measurements. Initial (dry) and final (wet) paint adhesion was also determined. EIS data were interpreted and discussed in terms of the time dependence of the electrical (paint coating) and electrochemical (steel substrate) parameters associated with interfacial processes describing the metal/paint system deterioration. According to the electrochemical properties, visual inspection and Original Research ArticleBritish Journal of Applied Science & Technology, 4(6): 853-878, 2014 854 standardized tests results, it was concluded that the studied polyurethane-based polymeric films applied on pretreated electrogalvanised steel provided a very effective protection against corrosion as a result of their excellent barrier properties.

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“…Vários autores na literatura como FERREIRA M.G.S. et al [22], CABRAL A. et al [23], CABRAL A.M. et al [24], TRABELSI W. et al [25], relatam estudos com diferentes tempos de imersão para o silano BTSPTS sobre o substrato de zinco, diferentes tempos de secagem em estufa e de temperaturas que podem variar de 100ºC, 120ºC a temperaturas superiores para as amostras a base de zinco,mostrando bons resultados.…”

Section: Btseptsunclassified

“…Os estudos desenvolvidos por Ferreira, et al [15], PENG e MAN [16], Aramaki K. [17], TRABELSI W. et al [18] e TRABELSI W. et al [19], registram estudos sobre o tratamento das superfícies de materiais a base de zinco fazendo uso das terras raras (Ce ou La) com objetivo de formar uma camada de passivação juntamente com o siloxano para melhorar a proteção por barreira contra a corrosão. Esses trabalhos (TR+silano) sobre superfícies de zinco apresentaram melhorias na resistência à corrosão e aderência em sistemas pintados.…”

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Avaliação da resistência à corrosão de eletrodepósitos de liga ZnFe sobre aço tratado com filmes contendo sais de terras raras e silanos BTSE, BTESPTS

Santos

Freire

2013

Matéria (Rio J.)

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O presente trabalho tem como objetivo avaliar a resistência a corrosão do aço revestido com eletrodepósito de liga ZnFe tratado com filmes constituídos de uma pré-camada obtida através de solução de sais de terras raras (Ce ou La) acrescida de filmes de silanos bis 1,2-[trietoxissilil]etano) (BTSE) e/ou bis-(3-[trietoxissilil]-propil) - tetrassulfeto (BTESPTS). Esses sistemas foram avaliados através das Curvas de Polarização, Espectroscopia de Impedância Eletroquímica (EIE), Microscopia Eletrônica de Varredura (MEV) e Espectrometria de Energia Dispersiva (EDS). Os resultados de EIE e polarização indicaram que os sistemas estudados foram eficientes contra corrosão e que seu desempenho depende do tipo de cátion do sal. O sistema ZnFe+Ce+BTSE+BTESPTS mostrou o melhor resultado contra corrosão.

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The use of pre-treatments based on doped silane solutions for improved corrosion resistance of galvanised steel substrates

Cited by 167 publications

References 35 publications

Realization of Graphene on the Surface of Electroless Ni–P Coating for Short-Term Corrosion Prevention

Realization of Graphene on the Surface of Electroless Ni–P Coating for Short-Term Corrosion Prevention

Characterization and Corrosion Resistance of Galvanized Steel/Passivation Composite/ Polyurethane Paint Systems

Avaliação da resistência à corrosão de eletrodepósitos de liga ZnFe sobre aço tratado com filmes contendo sais de terras raras e silanos BTSE, BTESPTS

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