Effect of silicate anion distribution in sodium silicate solution on silicate conversion coatings of hot-dip galvanized steels

Yuan, Meirong; J, Lu; Kong, Gang; Che, Chunshan

doi:10.1016/j.surfcoat.2011.03.064

Cited by 60 publications

(44 citation statements)

References 17 publications

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“…Multi-analytical technique analysis has indeed shown the formation of a thin outer layer of polymerized http://dx.doi.org/10.1016/j.electacta.2015.07.107 0013-4686/© 2015 Elsevier Ltd. All rights reserved. silica attached to an inner layer containing zinc silicate over the galvanized steel [11][12][13]. The final layer structure of the protecting surface film varied with the actual treatment procedure performed, that involved electrochemical treatment and surface polarization for optimization purposes [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the corrosion protection of steel by anodic processing in metasilicate solution using the scanning vibrating electrode technique

Izquierdo

Fernández-Pérez

Martín-Ruíz

et al. 2015

Electrochimica Acta

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Keywords: corrosion protection steel metasilicate ions surface modification anodic treatment scanning vibrating electrode technique a b s t r a c t Anodic processing in metasilicate solution was investigated for the improvement of the corrosion resistance of various steels, namely F111 low alloy carbon and 304 stainless steels, as well as on galvanized steel cut edges. The efficiency of the prior electrochemical treatment for each material was tested during their exposure to naturally-aerated aqueous chloride solutions of different aggressiveness. Analysis was performed using the scanning vibrating electrode technique (SVET) in order to detect local ionic current distributions over the samples under study associated to the corrosion reactions. The onset of corrosion processes was greatly inhibited after anodic processing with metasilicate on both the low alloy carbon steel and the galvanized steel cut edge. Conversely, SVET analysis of unbiased 304 steel samples tested in 0.1 M chloride-containing solution did not show differences between pristine and metasilicate-treated surfaces. Differences in the electrochemical reactivity between treated and non-treated 304 steel surfaces were only observed after partial removal of the corresponding passive layers under operator-controlled polarization.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the corrosion protection of steel by anodic processing in metasilicate solution using the scanning vibrating electrode technique

Izquierdo

Fernández-Pérez

Martín-Ruíz

et al. 2015

Electrochimica Acta

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“…Silicate conversion coatings are one of the best introduced alternatives to prevent aluminum alloys from corrosion [20,[22][23][24]. Silicate conversion coatings have attracted significant attention due to effective inhibitory against different types of corrosion [23][24][25][26], low cost [20,23], availability and non-toxic and environmentally friendly [20,23]. These coatings provide a superior inhibitory effect due to homogenous distribution of silicate on the surface [23].…”

Section: Introductionmentioning

confidence: 99%

“…Silicate conversion coatings have attracted significant attention due to effective inhibitory against different types of corrosion [23][24][25][26], low cost [20,23], availability and non-toxic and environmentally friendly [20,23]. These coatings provide a superior inhibitory effect due to homogenous distribution of silicate on the surface [23]. Silicate conversion coatings are widely developed in recent years.…”

Section: Introductionmentioning

confidence: 99%

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Kazemi

Danaee

Zaarei

2014

Materialwissenschaft Werkst

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Potassium silicate was deposited on AA2024 aluminum alloy as environmentally friendly conversion coatings and its corrosion behavior were examined by means of electrochemical impedance spectroscopy, potentiodynamic polarization and surfaces techniques. Potentiodynamic polarization curves show significant decrease in corrosion current density of silicate coated aluminum in NaCl solution. The corrosion resistance was increased with increasing silicate concentration of coating baths. The results indicated that the coating applied from 3 molar silicate baths is more uniform and continuous. The X-ray diffraction (XRD) and energy discharge spectroscopy (EDS) spectra confirm the existence of silicate film on the AA2024 surface. The coating performance was evaluated in acidic and basic NaCl solution and the results show the stability of silicate conversion coating in these solutions.

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“…Sodium silicates varying in ratio from Na 2 O·1.6SiO 2 to Na 2 O·4SiO 2 are known as colloidal silicates. These are sold as 20% to 50% aqueous solutions called water glass [4]. Sodium silicate cullets are produced by the direct fusion of precisely measured portions of pure silica sand (SiO 2 ) and soda ash (Na 2 CO 3 ) in oil, gas or electrically fired furnaces at temperatures above 1100…”

Section: Introductionmentioning

confidence: 99%

Production of Sodium Silicate Cullets by Using Trona

Özkan

2016

Acta Phys. Pol. A

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This study focuses on production and characterization of sodium silicate cullet by using trona. Sodium silicate cullets are generally produced by direct fusion of precisely measured portions of soda ash (Na2CO3) and quartz (SiO2). In this study trona (Na2CO3·NaHCO3 · 2H2O) was used as a source of soda ash. For this purpose trona sample was first characterized by X-ray diffraction, scanning electron microscopy, differential thermal analysis/thermal gravimetry and chemical analyses. Different batches were prepared and fused to produce sodium silicates varying in ratio Na2O·nSiO2. Produced samples were evaluated by X-ray diffraction and scanning electron microscopy. The results showed that trona can be used instead of soda ash to produce sodium silicate cullets.

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Effect of silicate anion distribution in sodium silicate solution on silicate conversion coatings of hot-dip galvanized steels

Cited by 60 publications

References 17 publications

Evaluation of the corrosion protection of steel by anodic processing in metasilicate solution using the scanning vibrating electrode technique

Evaluation of the corrosion protection of steel by anodic processing in metasilicate solution using the scanning vibrating electrode technique

Deposition and corrosion behavior of silicate conversion coatings on aluminum alloy 2024

Production of Sodium Silicate Cullets by Using Trona

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