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Tailoring the corrosion resistance of Zn-Mn coating by electrodeposition from deep eutectic solvents

Poboljšanje korozione postojanosti Zn-Mn prevlake, elektrohemijskim taloženjem iz dubokih eutektičkih smeša

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2018
2275.pdf (1.146Mb)
Authors
Bučko, Mihael
Stevanović, Sanja
Bajat, Jelena
Article (Published version)
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Abstract
Well adhered, homogenous coatings were obtained from deep eutectic solvents (DES) based on choline chloride and urea, at current densities up to 20 mA cm-2. The coatings' morphology was analyzed by atomic force microscopy, determining the agglomerates size and distribution. The corrosion stability of these deposits was analyzed in 3 wt. % NaCl solution by electrochemical impedance spectroscopy and polarization measurements, and compared with coatings deposited from a conventional water-based electrolyte. The influence of deposition current density and surface morphology, as well as of DES type, on the corrosion resistance was analyzed. It was shown that electrodeposition from DES enables incorporation of greater Mn amounts, that induced a pseudo-passivation effect, which, in turn, resulted in superior corrosion resistance.
Elektrohemijskim taloženjem iz eutektičke smeše na bazi holin hlorida i uree, gustinama struje taloženja do 20 mA cm-2 dobijene su homogene prevlake Zn-Mn legure, dobre adhezije na čeliku. Morfologija dobijenih prevlaka je ispitivana mikroskopijom međuatomskih sila. Određene su veličine aglomerata kristalnih zrna i njihova raspodela po površini u zavisnosti od vrste rastvora za taloženje i gustine struje taloženja. Koroziona stabilnost prevlaka legura je ispitivana spektroskopijom elektrohemijske impedancije i polarizacionim merenjima u rastvoru 3 % NaCl i upoređena je sa svojstvima prevlaka dobijenih elektrohemijskim taloženjem iz vodenih rastvora. Pokazan je uticaj gustine struje taloženja, morfologije prevlaka, kao i vrste eutektičke smeše, na otpornost elektrohemijski taloženih prevlaka legura prema koroziji. Elektrohemijskim taloženjem iz eutektičkih smeša je moguće dobiti prevlake Zn-Mn legure sa većim sadržajem Mn, koje dovode do pojave pseudo-pasivnog sloja na površini, povećav...ajući njihovu korozionu stabilnost.

Keywords:
electrochemical deposition / Zn-Mn alloy / coatings / deep eutectic solvent / corrosion stability / elektrohemijsko taloženje / Zn-Mn legure / eutektičke smeše / koroziona stabilnost
Source:
Zaštita materijala, 2018, 59, 2, 173-181
Publisher:
  • Belgrade, Serbia : Engineering Society for Corrosion
Projects:
  • Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)
  • This research was financed by the University of Defence, Republic of Serbia (Project No. VA˗TT/2˗17˗19

DOI: 10.5937/ZasMat1802173B

ISSN: 0351-9465

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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2277
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