Chromate-free passivation of galvanized steel in a solution based on lanthanum nitrate
Abstract
The present work is focused on the development of both effective and safe technology for deposition of lanthanum-containing coatings as an alternative in comparison to the traditional chromating processes, which are currently not recommended for use due to the well-known toxicity of Cr(VI) ions. A procedure has been developed for obtaining lanthanum-containing coatings on galvanized steel from aqueous solutions based on lanthanum nitrate and hydrogen peroxide, and the properties of the obtained coatings have been studied. The thickness of the resulting lanthanum-containing coatings is found to be ~135 nm. The mechanism of coating formation is discussed. The optimal conditions for obtaining coatings are determined. The results of the study indicate that the developed lanthanum-containing passivating coatings on galvanized steel are comparable to chromate coatings in terms of corrosion resistance and protective ability and, at the same time, leave them behind in terms of environmental safety.
References
Okulov, V.V. (2008). Zinc Plating. Procedure and Technology. Ed. by V.N. Kudryavtsev. M.: Globus (in Russ).
Gardner, A., & Sharf, D. (2002). Effective replacement of chromate solutions for passivation of galvanic coatings with zinc and its alloys. Galvanotekhnika i Obrabotka Poverkhnosti = Electroplating & Surface Treatment, 10(4), 39 - 45 (in Russ).
Botarri, P., & Preux, C. (2001). Passivations a base de chrome trivalent dans l'industrie automobile: Quelles performances? Galvano organo. Traitement de Surfase & Peintere, 717, 845.
Directive 2000/53/EC of the European Parliament and of the Council of 18 September 2000 on End-of Life Vehicles. (2000). Off. J. Eur. Communities: Legis., 43(L269), 34 - 43.
Bhatt, H.A. (2002). Replacement of Hexavalent Chromium in Automotive Industry for ELV Directive, Technical Paper, Sur/Fin, 6/2002, Chicago.
Directive 2011/65/EC (RoHS II) of the European Parliament and of the Council of 8 June 2011 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment.
Directive 2002/96/EC of the European Parliament and of the Council of 27 January 2003 on Waste Electrical and Electronic Equipment (WEEE).
Regulation (EC) no. 1907/2006 of the European Parliament and of the Council of 18 December 2006 concerning the Registration, Evaluation, Authorization and Restriction of Chemicals (REACH), Establishing a European Chemicals Agency.
Technical Regulation of the Eurasian Economic Union TR EAWU 037/2016 on Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment. Adopted on October 18, 2016.
Zhou, W., Sheng, L., Xin, S., Wang, J., Kang, Y., & Wu, S. (2013). Effect of molybdate bath service life on corrosion resistance of conversion coating deposited on hot dip galvanized steel. Advanced Materials Research, 750-752, 2012 - 2016. https://doi.org/10.4028/www.scientific.net/AMR.750-752.2012
Liu, G.M., Yang, L., & Du, N. (2011). Study of molybdate-phytic acid passivation on galvanised steel. Corrosion Engineering, Science and Technology, 46(4), 542 - 546. https://doi.org/10.1179/147842209X12579401586528
Meshalkin, V.P., Abrashov, A.A., Vagramyan, T.A., Grigoryan, N.S., & Utochkina, D.S. (2018). Development of composition and investigation of properties of a new, environmentally friendly molybdenum-containing decorative protective conversion coating on zinс-plated surfaces. Doklady Chemistry, 480(2), 132 - 135. https://doi.org/10.1134/S0012500818060046
Milosev, I., & Frankel, G.S. (2018). Review − conversion coatings based on zirconium and/or titanium. Journal of the Electrochemical Society, 165(3), C127 - C144. https://doi.org/10.1149/2.0371803jes
Abrashov, A.A., Grigoryan, N.S., Volkova, A.E., YArovaya, O.V., & Vagramyan, T.A. (2016). Protective titanium oxide nanocoatings on zinc-plated steel. Galvanotekhnika i Obrabotka Poverkhnosti = Electroplating & Surface Treatment, 24(2), 28 - 34 (in Russ). DOI: 10.47188/0869-5326_2016_24_2_28.
Mohammadloo, H.E., Sarabi, A.A., Alvani, A.A.S., Salimi, R., & Sameie, H. (2013). The effect of solution temperature and pH on corrosion performance and morphology of nanoceramic-based conversion thin film. Materials and Corrosion, 64(6), 535 - 543. https://doi.org/10.1002/maco.201106384
Fan, Y., Lin, P., & Shi, S. (2011). Silicate-based passivation technique on alkaline electrodeposited zinc coatings. Advanced Materials Research, 154-155, 433 - 436. https://doi.org/10.4028/www.scientific.net/AMR.154-155.433
Abrashov, A.A., Grigoryan, N.S., Zheludkova, E.A., Vagramyan, T.A., & Asnis, N.A. (2019). Silicon-containing solution for passivation of zinc coatings. Russian Journal of Applied Chemistry, 92(10), 1432-1438. https://doi.org/10.1134/S1070427219100136
Mezhuev, Ya.O., Korshak, Yu.V., Vagramyan, T.A., Abrashov, A.A., Piskareva ,A.I., Yur’eva, G.A., & Shtil'man, M.I. (2014). New anticorrosion coatings based on crosslinked copolymers of pyrrole and epoxy-containing compounds. International Polymer Science & Technology, 41(4), Т53 - Т60. https://doi.org/10.1177/0307174X1404100409
Liu, G., Yu, F., Yang, L., Tian, J., & Du, N. (2009). Cerium-tannic acid passivation treatment on galvanized steel. Rare metals, 28(3), 284 - 288. https://doi.org/10.1007/s12598-009-0056-9
Fan, Y., Jiang, Y., & Zhou, R. (2011). New passivating method to galvanized Zn coatings on steel substrate. Advanced Materials Research, 163-167, 4555 - 4558. https://doi.org/10.4028/www.scientific.net/AMR.163-167.4555
Johnson, B.Y., Edington, J., & O’Keefe, M.J. (2003). Effect of coating parameters on the microstructure of cerium oxide conversion coatings. Materials Science and Engineering, 361(1-2), 225 - 231. https://doi.org/10.1016/S0921-5093(03)00516-1
Song, Y.-K., & Mansfeld, F. (2006). Technical Note: Corrosion protection of electrogalvanized steel by a cerium-based conversion coating. Corrosion, 62(12), 1067 - 1073. https://doi.org/10.5006/1.3278240
Zheludkova, E.A., Abrashov, A.A., Grigoryan, N.S., Asnis, N.A., & Vagramyan, T.A. (2019). Cerium-containing solution for chromate-free passivation of zinc coatings. Protection of Metals and Physical Chemistry of Surfaces, 55(7), 1329 - 1334. https://doi.org/10.1134/S2070205119070190
Kőszegi, S., Felhősi, I., Kármán, F.H., & Kálmán, E. (2005). Temporary corrosion protection of galvanised steel by coatings containing cerium, yttrium and lanthanum. Materials Science Forum, 474, 219 - 224. https://doi.org/10.4028/www.scientific.net/MSF.473-474.219
GOST (State Standard) 9.302-88. Metal and non-metal inorganic coatings. Control methods (in Russ).
Woicik, J.C. (2016). Hard X-ray Photoelectron Spectroscopy (HAXPES). ChamCity, Switzerland: Springer International Publishing.
Shirley, D.A. (1972). High-resolution X-ray photoemission spectrum of the valence bands of gold. Phys. Rev. B, 5, 4709 - 4713. https://doi.org/10.1103/PhysRevB.5.4709
Scofield, J. H. (1976). Hartree-Slater subshell photoionization cross-sections at 1254 and 1487 eV. J. Electron Spectrosc. Relat. Phenom., 8(2), 129 - 137. https://doi.org/10.1016/0368-2048(76)80015-1
Mohai, M. (2004). XPS MultiQuant: multimodel XPS quantification software. Surf. Interface Anal., 36, 828 - 832. https://doi.org/10.1002/sia.1775
Cumpson, P.J., & Seah, M.P. (1997). Elastic scattering corrections in AES and XPS. II. Estimating attenuation lengths and conditions required for their valid use in Overlayer, Substrate experiments, Surface and Interface Analysis, 25, 430 - 446. https://doi.org/10.1002/(SICI)1096-9918(199706)25:6<430::AID-SIA254>3.0.CO;2-7
ASTM B117-11. Standard Practice for Operating Salt Spray (Fog) Apparatus.
GOST (State Standard) 9.401-91: Unified System of Corrosion and Ageing Protection. Paint Coatings. General Requirements and Methods of Accelerated Tests on Resistance to the Action of Climatic Factors (in Russ).
Laha, P., Schram, T., & Terry, H. (2002). Use of spectroscopic ellipsometry to study Zr/Ti films on Al. Surface and Interface Analysis, 34(1), 677 - 680. https://doi.org/10.1002/sia.1386
Roeseler, A. (2005). Spectroscopic Infrared Ellipsometry. In: Handbook of Ellipsometry, W. Andrew, 763 - 798. https://doi.org/10.1016/B978-081551499-2.50013-7
Jones, C.W. (1999). Applications of hydrogen peroxide and derivatives. UK: The Royal Society of Chemistry, pp. 72 - 73. https://doi.org/10.1039/9781847550132
Copyright (c) 2020 Alexey A. Abrashov, Nelya S. Grigoryan, Natalia D. Kondrat’eva, Ekaterina A. Zheludkova, Vladimir S. Miroshnikov, and Diana V. Mazurova
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