1
|
Fernández-Solis C, Keil P, Erbe A. Molybdate and Phosphate Cross-Linked Chitosan Films for Corrosion Protection of Hot-Dip Galvanized Steel. ACS OMEGA 2023; 8:19613-19624. [PMID: 37305241 PMCID: PMC10249392 DOI: 10.1021/acsomega.3c01119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Accepted: 05/11/2023] [Indexed: 06/13/2023]
Abstract
Environmentally friendly and sustainable methods to protect hot-dip galvanized (HDG) steel from corrosion are extensively studied. Films of the biopolymer polyelectrolyte chitosan were ionically cross-linked in this work with the well-known corrosion inhibitors phosphate and molybdate. Layers on this basis are presented as components in a protective system and could, e.g., be applied in pretreatments similar to a conversion coating. For the preparation of the chitosan-based films, a procedure involving sol-gel chemistry and wet-wet application was utilized. Homogeneous films of few micrometers thickness were obtained on HDG steel substrates after thermal curing. Properties of chitosan-molybdate and chitosan-phosphate films were compared with purely passive epoxysilane-cross-linked chitosan, and pure chitosan. Delamination behavior of a poly(vinyl butyral) (PVB) weak model top coating studied by scanning Kelvin probe (SKP) showed an almost linear time dependence over >10 h on all systems. Delamination rates were 0.28 mm h-1 (chitosan-molybdate) and 0.19 mm h-1 (chitosan-phosphate), ca. 5% of a non-cross-linked chitosan reference and slightly higher than of the epoxsyilane cross-linked chitosan. Immersion of the treated zinc samples over 40 h in 5% NaCl solution yielded a 5-fold increase of the resistance in the chitosan-molybdate system, as evidenced by electrochemical impedance spectroscopy (EIS). Ion exchange of electrolyte anions with molybdate and phosphate triggers corrosion inhibition, presumably by reaction with the HDG surface as well described in the literature for these inhibitors. Thus, such surface treatments have potential for application, e.g., in temporary corrosion protection.
Collapse
Affiliation(s)
- Christian Fernández-Solis
- Department
of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
| | - Patrick Keil
- BASF
Coatings GmbH, Glasuritstraße
1, 48165 Münster, Germany
| | - Andreas Erbe
- Department
of Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
- Department
of Materials Science and Engineering, NTNU, Norwegian University of Science and Technology, 7491 Trondheim, Norway
| |
Collapse
|
2
|
Szőke ÁF, Szabó GS, Hórvölgyi Z, Albert E, Végh AG, Zimányi L, Muresan LM. Accumulation of 2-Acetylamino-5-mercapto-1,3,4-thiadiazole in chitosan coatings for improved anticorrosive effect on zinc. Int J Biol Macromol 2020; 142:423-431. [PMID: 31593734 DOI: 10.1016/j.ijbiomac.2019.09.114] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/02/2019] [Accepted: 09/15/2019] [Indexed: 10/25/2022]
Abstract
Chitosan (Chit) coatings were applied on zinc substrates by the dip-coating method. Subsequently, the coatings were impregnated with a corrosion inhibitor, 2-Acetylamino-5-mercapto-1,3,4-thiadiazole (AcAMT) to obtain an increased anticorrosive effect. The coating thickness and the AcAMT accumulation were determined using UV-Vis spectroscopy on glass and quartz substrates, respectively. The surface morphology and coverage were investigated with atomic force microscopy. Electrochemical impedance spectroscopy and potentiodynamic polarization techniques were used to investigate the protective properties of the impregnated coatings. The chitosan coatings facilitated the accumulation of the corrosion inhibitor inside the polymeric matrix (a multiplication of 380 times compared to the impregnating solution concentration was calculated), channeling high amounts of AcAMT to the Zn surface, which resulted in an inhibition efficiency of >90%. This effect demonstrates the applicability of chitosan coatings as carriers for corrosion inhibitors, significantly reducing the amount of inhibitor needed to achieve good anticorrosive effects.
Collapse
Affiliation(s)
- Árpád Ferenc Szőke
- Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemical Engineering, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania
| | - Gabriella Stefánia Szabó
- Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemistry and Chemical Engineering of the Hungarian Line, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania
| | - Zoltán Hórvölgyi
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, Budafoki út 6-8, Budapest HU-1111, Hungary
| | - Emőke Albert
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, Department of Physical Chemistry and Materials Science, Centre for Colloid Chemistry, Budafoki út 6-8, Budapest HU-1111, Hungary
| | - Attila Gergely Végh
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári Krt. 62, Szeged H-6726, Hungary
| | - László Zimányi
- Institute of Biophysics, Biological Research Centre, Hungarian Academy of Sciences, Temesvári Krt. 62, Szeged H-6726, Hungary
| | - Liana Maria Muresan
- Babeş-Bolyai University, Faculty of Chemistry and Chemical Engineering, Research Center in Electrochemistry and Non-conventional Materials, 11 Arany János St., Cluj-Napoca RO-400028, Romania; Department of Chemical Engineering, Babeş-Bolyai University, 11 Arany János St., Cluj-Napoca RO-400028, Romania.
| |
Collapse
|
3
|
Szőke ÁF, Szabó GS, Hórvölgyi Z, Albert E, Gaina L, Muresan LM. Eco-friendly indigo carmine-loaded chitosan coatings for improved anti-corrosion protection of zinc substrates. Carbohydr Polym 2019; 215:63-72. [DOI: 10.1016/j.carbpol.2019.03.077] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 03/12/2019] [Accepted: 03/23/2019] [Indexed: 12/11/2022]
|