{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,20]],"date-time":"2025-12-20T22:16:01Z","timestamp":1766268961789,"version":"build-2065373602"},"reference-count":42,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2015,4,30]],"date-time":"2015-04-30T00:00:00Z","timestamp":1430352000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Coatings"],"abstract":"<jats:p>Previous studies have shown that the barrier effect and the performance of organic-inorganic hybrid (OIH) sol-gel coatings are highly dependent on the coating deposition method as well as on the processing conditions. However, studies on how the coating deposition method influences the barrier properties in alkaline environments are scarce. The aim of this experimental research was to study the influence of experimental parameters using the dip-coating method on the barrier performance of an OIH sol-gel coating in contact with simulated concrete pore solutions (SCPS). The influence of residence time (Rt), a curing step between each dip step and the number of layers of sol-gel OIH films deposited on hot-dip galvanized steel to prevent corrosion in highly alkaline environments was studied. The barrier performance of these OIH sol-gel coatings, named U(400), was assessed in the first instants of contact with SCPS, using electrochemical impedance spectroscopy and potentiodynamic methods. The durability and stability of the OIH coatings in SCPS was monitored during eight days by macrocell current density. The morphological characterization of the surface was performed by Scanning Electronic Microscopy before and after exposure to SCPS. Glow Discharge Optical Emission Spectroscopy was used to investigate the thickness of the U(400) sol-gel coatings as a function of the number of layers deposited with and without Rt in the coatings thickness.<\/jats:p>","DOI":"10.3390\/coatings5020124","type":"journal-article","created":{"date-parts":[[2015,5,4]],"date-time":"2015-05-04T03:06:25Z","timestamp":1430708785000},"page":"124-141","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Influence of Experimental Parameters Using the Dip-Coating Method on the Barrier Performance of Hybrid Sol-Gel Coatings in Strong Alkaline Environments"],"prefix":"10.3390","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8146-4231","authenticated-orcid":false,"given":"Rita","family":"Figueira","sequence":"first","affiliation":[{"name":"LNEC, Laborat\u00f3rio Nacional de Engenharia Civil, Av. Brasil 101, 1700-066 Lisboa, Portugal"},{"name":"Centro de Qu\u00edmica, Universidade do Minho, Campus de Gualtar 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6211-3295","authenticated-orcid":false,"given":"Carlos","family":"Silva","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica, Universidade do Minho, Campus de Gualtar 4710-057 Braga, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0619-258X","authenticated-orcid":false,"given":"Elsa","family":"Pereira","sequence":"additional","affiliation":[{"name":"LNEC, Laborat\u00f3rio Nacional de Engenharia Civil, Av. Brasil 101, 1700-066 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2015,4,30]]},"reference":[{"key":"ref_1","unstructured":"Virmani, Y.P. (2002). Corrosion Costs and Preventive Strategies in the United States, US Department of Transportation."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"536","DOI":"10.1016\/j.cemconres.2005.11.007","article-title":"Corrosion inhibitors for chlorides induced corrosion in reinforced concrete structures","volume":"36","author":"Ormellese","year":"2006","journal-title":"Cem. Concr. Res."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"B\u00f6hni, H. (2005). Corrosion in Reinforced Concrete Structures, Woodhead Publishing Ltd.","DOI":"10.1533\/9781845690434"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"109","DOI":"10.1038\/297109a0","article-title":"Aspects of the electrochemistry of steel in concrete","volume":"297","author":"Page","year":"1982","journal-title":"Nature"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1016\/j.corsci.2014.12.003","article-title":"Enhancing corrosion resistance of reinforced concrete structures with hybrid fiber reinforced concrete","volume":"92","author":"Blunt","year":"2015","journal-title":"Corros. Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1059","DOI":"10.4028\/www.scientific.net\/MSF.636-637.1059","article-title":"Long-term efficiency of two organic corrosion inhibitors for reinforced concrete","volume":"636\u2013637","author":"Pereira","year":"2010","journal-title":"Mater. Sci. Forum"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Yeomans, S.R. (2004). Galvanized Steel Reinforcement in Concrete, Elsevier.","DOI":"10.1016\/B978-008044511-3\/50016-5"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"246","DOI":"10.1016\/j.cemconcomp.2006.01.011","article-title":"Corrosion behaviour in concrete of three differently galvanized steel bars","volume":"28","author":"Bellezze","year":"2006","journal-title":"Cem. Concr. Compos."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"2853","DOI":"10.1016\/j.corsci.2011.05.023","article-title":"Hydrogen embrittlement risk of high strength galvanized steel in contact with alkaline media","volume":"53","author":"Recio","year":"2011","journal-title":"Corros. Sci."},{"key":"ref_10","first-page":"323","article-title":"Des aciers \u00e0 haute r\u00e9sistance, galvanis\u00e9s, utilisables comme armatures de b\u00e9ton pr\u00e9contraint","volume":"8","author":"Brachet","year":"1975","journal-title":"Mater. Struct."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.resconrec.2011.10.001","article-title":"Reduction of zinc consumption with enhanced corrosion protection in hot-dip galvanized coatings: A process-based cost analysis","volume":"58","author":"Akamphon","year":"2012","journal-title":"Resour. Conserv. Recycl."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Porter, F.C. (1994). Corrosion Resistance of Zinc and Zinc Alloys, CRC Press.","DOI":"10.1201\/9781482293524"},{"key":"ref_13","first-page":"51","article-title":"Corrosion of hot-dip galvanized steel reinforcement","volume":"33","author":"Figueira","year":"2014","journal-title":"Corros. E Prot. Mater."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"275","DOI":"10.1016\/j.conbuildmat.2004.07.008","article-title":"Bond strength of hot-dip galvanized reinforcement in normal strength concrete structures","volume":"19","author":"Hamad","year":"2005","journal-title":"Constr. Build. Mater."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1179\/000705987798271505","article-title":"Corrosion of galvanized steel in dilute Ca(OH)2 solutions (pH 11\u00b71\u201312\u00b76)","volume":"22","author":"Andrade","year":"1987","journal-title":"Br. Corros. J."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1179\/000705987798271631","article-title":"Corrosion of galvanized steel reinforcements in alkaline solutions: Part 1: Electrochemical results","volume":"22","author":"Macias","year":"1987","journal-title":"Br. Corros. J."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"119","DOI":"10.1179\/000705987798271749","article-title":"Corrosion of galvanized steel reinforcements in alkaline solutions: Part 2: SEM study and identification of corrosion products","volume":"22","author":"Macias","year":"1987","journal-title":"Br. Corros. J."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1179\/bcj.1983.18.2.82","article-title":"Corrosion rate of galvanized steel immersed in saturated solutions of Ca(OH)2 in the pH range 12\u201313\u00b78","volume":"18","author":"Andrade","year":"1983","journal-title":"Br. Corros. J."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Figueira, R.B., Silva, C.J.R., and Pereira, E.V. (2014). Organic\u2013inorganic hybrid sol\u2013gel coatings for metal corrosion protection: A review of recent progress. J. Coat. Technol. Res., 1\u201335.","DOI":"10.1007\/s11998-014-9595-6"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1007\/s10971-012-2838-z","article-title":"Sol\u2013gel derived hybrid coatings as an environment friendly surface treatment for corrosion protection of metals and their alloys","volume":"64","author":"Balgude","year":"2012","journal-title":"J. Sol-Gel Sci. Technol."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"443","DOI":"10.1007\/BF02436880","article-title":"Sol-gel coatings on metals","volume":"8","author":"Guglielmi","year":"1997","journal-title":"J. Sol-Gel Sci. Technol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"C467","DOI":"10.1149\/2.033310jes","article-title":"Ureasilicate hybrid coatings for corrosion protection of galvanized steel in cementitious media","volume":"160","author":"Figueira","year":"2013","journal-title":"J. Electrochem. Soc."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"256","DOI":"10.1016\/j.cemconcomp.2006.01.004","article-title":"Electrochemical and analytical assessment of galvanized steel reinforcement pre-treated with Ce and La salts under alkaline media","volume":"28","author":"Alonso","year":"2006","journal-title":"Cem. Concr. Compos."},{"key":"ref_24","unstructured":"(2007). ASTM G109 Test Method for Determining Effects of Chemical Admixtures on Corrosion of Embedded Steel Reinforcement in Concrete Exposed to Chloride Environments, ASTM International."},{"key":"ref_25","unstructured":"(2005). ISO 16962:2005 Surface Chemical Analysis\u2014Analysis of Zinc- and\/or Aluminium-Based Metallic Coatings by Glow-Discharge Optical-Emission Spectrometry, ISO."},{"key":"ref_26","unstructured":"Khulbe, K.C., Feng, C.Y., and Matsuura, T. (2008). Synthetic Polymeric Membranes, SSpringer Berlin Heidelberg. pringer Laboratory."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Zheludkevich, M.L., Yasakau, K.A., Bastos, A.C., Karavai, O.V., and Ferreira, M.G.S. (2007). On the application of electrochemical impedance spectroscopy to study the self-healing properties of protective coatings. Electrochem. Commun., 2622\u20132628.","DOI":"10.1016\/j.elecom.2007.08.012"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"39","DOI":"10.1007\/s11998-011-9339-9","article-title":"Polarization and impedance studies on zinc phosphate coating developed using galvanic coupling","volume":"9","author":"Arthanareeswari","year":"2012","journal-title":"J. Coat. Technol. Res."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/j.porgcoat.2006.08.029","article-title":"Nanoporous titania interlayer as reservoir of corrosion inhibitors for coatings with self-healing ability","volume":"58","author":"Lamaka","year":"2007","journal-title":"Prog. Org. Coat."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Barsoukov, E., and Macdonald, J.R. (2005). Impedance Spectroscopy: Theory, Experiment, and Applications, Wiley. [2nd Ed.].","DOI":"10.1002\/0471716243"},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Orazem, M.E., and Tribollet, B. (2008). Electrochemical Impedance Spectroscopy, Wiley.","DOI":"10.1002\/9780470381588"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"6218","DOI":"10.1016\/j.electacta.2009.10.065","article-title":"Determination of effective capacitance and film thickness from constant-phase-element parameters","volume":"55","author":"Hirschorn","year":"2010","journal-title":"Electrochim. Acta"},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Hsu, C.H., and Mansfeld, F. (2001). Technical note: concerning the conversion of the constant phase element parameter Y0 into a capacitance. Corrosion, 57.","DOI":"10.5006\/1.3280607"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"6943","DOI":"10.1016\/j.apsusc.2008.04.112","article-title":"Corrosion behaviour of galvanized steel and electroplating steel in aqueous solution: AC impedance study and XPS","volume":"254","author":"Lebrini","year":"2008","journal-title":"Appl. Surf. Sci."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"1201","DOI":"10.1016\/j.corsci.2009.01.014","article-title":"Corrosion protection of galvanized steel and electroplating steel by decano\u00efc acid in aqueous solution: Electrochemical impedance spectroscopy, XPS and ATR-FTIR","volume":"51","author":"Lebrini","year":"2009","journal-title":"Corros. Sci."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1539","DOI":"10.1016\/S0010-938X(98)00203-0","article-title":"Characterization of a thin protective coating on galvanized steel by electrochemical impedance spectroscopy and a thermostimulated current method","volume":"41","author":"Corfias","year":"1999","journal-title":"Corros. Sci."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"2455","DOI":"10.1016\/j.corsci.2009.06.037","article-title":"Corrosion behaviour of molybdate\u2013phosphate\u2013silicate coatings on galvanized steel","volume":"51","author":"Hamlaoui","year":"2009","journal-title":"Corros. Sci."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1016\/j.porgcoat.2011.09.007","article-title":"Synthesis and characterization of corrosion protective polyurethanefattyamide\/silica hybrid coating material","volume":"73","author":"Ahmad","year":"2012","journal-title":"Prog. Org. Coat."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"277","DOI":"10.4152\/pea.201305277","article-title":"Corrosion protection of hot dip galvanized steel in mortar","volume":"31","author":"Figueira","year":"2013","journal-title":"Port. Electrochim. Acta"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"409","DOI":"10.1007\/BF02473980","article-title":"Effect of four coating structures on corrosion kinetic of galvanized reinforcement in concrete","volume":"17","author":"Vazquez","year":"1984","journal-title":"Mat\u00e9r. Constr."},{"key":"ref_41","unstructured":"Everett, L.H., and Treadaway, K.W.J. (1970). The Use of Galvanised Steel Reinforcement in Building, Building Research Station, Ministry of Public Building and Works."},{"key":"ref_42","doi-asserted-by":"crossref","unstructured":"Wilson, A.D., Nicholson, J.W., and Prosser, H.J. (1988). Surface Coatings\u20142, Springer.","DOI":"10.1007\/978-94-009-1351-6"}],"container-title":["Coatings"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2079-6412\/5\/2\/124\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T20:45:40Z","timestamp":1760215540000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2079-6412\/5\/2\/124"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2015,4,30]]},"references-count":42,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2015,6]]}},"alternative-id":["coatings5020124"],"URL":"https:\/\/doi.org\/10.3390\/coatings5020124","relation":{},"ISSN":["2079-6412"],"issn-type":[{"type":"electronic","value":"2079-6412"}],"subject":[],"published":{"date-parts":[[2015,4,30]]}}}