Microstructure and corrosion behaviour of Zn-Co alloys deposited from three different plating baths
Mikrostruktura i koroziono ponašanje Zn-Co legura taloženih iz sulfatnog i hloridnih rastvora
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The effects of plating baths of different composition on the micro- structure and corrosion stability of Zn-Co alloy coatings were studied. Zn-Co alloys with the same Co content were deposited from chloride plating baths containing different amounts of Co2+, as well as from a sulphate-chloride plating bath. The surface morphology and crystallite size were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The corrosion stability of the Zn-Co alloys was determined by following the change of the open circuit potential with time of immersion in a 3 % NaCl solution and by polarization measurements. The results showed a significant influence of the plating bath on the morphology and corrosion stability of the Zn-Co alloys. The surface of the alloy coatings deposited from the chloride baths were uniform and homogenous, whereas the deposit obtained from the sulphate-chloride bath was quite inhomogeneous. The corrosion stability of the homogenous Zn-Co deposi...ts obtained by deposition from both chloride baths was higher than that of the deposit obtained from the sulphate-chloride bath. An increase in the Co content in the chloride-plating bath resulted in a reduction of the alloy crystallite size and it was shown that the alloy with the smaller crystallites of the two alloy deposits, although having the same chemical content, exhibited a lower corrosion rate.
U ovom radu je proučavan uticaj vrste rastvora za taloženje na mikrostrukturu i korozionu stabilnost prevlaka Zn-Co legura. Zn-Co legure sa istim sadržajem Co su elektrohemijski taložene iz hloridnih rastvora sa različitim sadržajem jona kobalta, kao i iz sulfatno-hloridnog rastvora. Morfologija površine prevlaka je ispitivana skenirajućom elektronskom mikroskopijom i mikroskopijom atomskih sila. Koroziona stabilnost prevlaka Zn-Co legura je određivana praćenjem promene potencijala otvorenog kola sa vremenom delovanja rastvora NaCl koncentracije 3%, kao i polarizacionim merenjima. Dobijeni rezultati su pokazali značajan uticaj vrste rastvora za taloženje na morfologiju i korozionu stabilnost prevlaka Zn-Co legura. Prevlake Zn-Co legura dobijene iz hloridnih rastvora su homogene, dok su prevlake dobijene iz sulfatno-hloridnog rastvora nehomogene. Koroziona stabilnost prevlaka legura dobijenih iz oba hloridna rastvora je veća u odnosu na stabilnost legura dobijenih iz sulfatno-hloridnog ...rastvora. Povećanjem sadržaja kobalta u hloridnom rastvoru za taloženje dobijaju se prevlake manjih kristalita i u radu je pokazano kako veličina kristalita utiče na korozionu stabilnost legura sa istim sadržajem kobalta.
Ključne reči:
electrodeposition / coatings / Zn-Co alloy / corrosion / AFMIzvor:
Journal of the Serbian Chemical Society, 2011, 76, 11, 1537-1550Izdavač:
- Serbian Chemical Society, Belgrade
Finansiranje / projekti:
- Sinteza, razvoj tehnologija dobijanja i primena nanostrukturnih multifunkcionalnih materijala definisanih svojstava (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45019)
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Bajat, Jelena AU - Stevanović, Sanja AU - Jokić, Bojan PY - 2011 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1796 AB - The effects of plating baths of different composition on the micro- structure and corrosion stability of Zn-Co alloy coatings were studied. Zn-Co alloys with the same Co content were deposited from chloride plating baths containing different amounts of Co2+, as well as from a sulphate-chloride plating bath. The surface morphology and crystallite size were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The corrosion stability of the Zn-Co alloys was determined by following the change of the open circuit potential with time of immersion in a 3 % NaCl solution and by polarization measurements. The results showed a significant influence of the plating bath on the morphology and corrosion stability of the Zn-Co alloys. The surface of the alloy coatings deposited from the chloride baths were uniform and homogenous, whereas the deposit obtained from the sulphate-chloride bath was quite inhomogeneous. The corrosion stability of the homogenous Zn-Co deposits obtained by deposition from both chloride baths was higher than that of the deposit obtained from the sulphate-chloride bath. An increase in the Co content in the chloride-plating bath resulted in a reduction of the alloy crystallite size and it was shown that the alloy with the smaller crystallites of the two alloy deposits, although having the same chemical content, exhibited a lower corrosion rate. AB - U ovom radu je proučavan uticaj vrste rastvora za taloženje na mikrostrukturu i korozionu stabilnost prevlaka Zn-Co legura. Zn-Co legure sa istim sadržajem Co su elektrohemijski taložene iz hloridnih rastvora sa različitim sadržajem jona kobalta, kao i iz sulfatno-hloridnog rastvora. Morfologija površine prevlaka je ispitivana skenirajućom elektronskom mikroskopijom i mikroskopijom atomskih sila. Koroziona stabilnost prevlaka Zn-Co legura je određivana praćenjem promene potencijala otvorenog kola sa vremenom delovanja rastvora NaCl koncentracije 3%, kao i polarizacionim merenjima. Dobijeni rezultati su pokazali značajan uticaj vrste rastvora za taloženje na morfologiju i korozionu stabilnost prevlaka Zn-Co legura. Prevlake Zn-Co legura dobijene iz hloridnih rastvora su homogene, dok su prevlake dobijene iz sulfatno-hloridnog rastvora nehomogene. Koroziona stabilnost prevlaka legura dobijenih iz oba hloridna rastvora je veća u odnosu na stabilnost legura dobijenih iz sulfatno-hloridnog rastvora. Povećanjem sadržaja kobalta u hloridnom rastvoru za taloženje dobijaju se prevlake manjih kristalita i u radu je pokazano kako veličina kristalita utiče na korozionu stabilnost legura sa istim sadržajem kobalta. PB - Serbian Chemical Society, Belgrade T2 - Journal of the Serbian Chemical Society T1 - Microstructure and corrosion behaviour of Zn-Co alloys deposited from three different plating baths T1 - Mikrostruktura i koroziono ponašanje Zn-Co legura taloženih iz sulfatnog i hloridnih rastvora EP - 1550 IS - 11 SP - 1537 VL - 76 UR - https://hdl.handle.net/21.15107/rcub_technorep_1796 ER -
@article{ author = "Bajat, Jelena and Stevanović, Sanja and Jokić, Bojan", year = "2011", abstract = "The effects of plating baths of different composition on the micro- structure and corrosion stability of Zn-Co alloy coatings were studied. Zn-Co alloys with the same Co content were deposited from chloride plating baths containing different amounts of Co2+, as well as from a sulphate-chloride plating bath. The surface morphology and crystallite size were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The corrosion stability of the Zn-Co alloys was determined by following the change of the open circuit potential with time of immersion in a 3 % NaCl solution and by polarization measurements. The results showed a significant influence of the plating bath on the morphology and corrosion stability of the Zn-Co alloys. The surface of the alloy coatings deposited from the chloride baths were uniform and homogenous, whereas the deposit obtained from the sulphate-chloride bath was quite inhomogeneous. The corrosion stability of the homogenous Zn-Co deposits obtained by deposition from both chloride baths was higher than that of the deposit obtained from the sulphate-chloride bath. An increase in the Co content in the chloride-plating bath resulted in a reduction of the alloy crystallite size and it was shown that the alloy with the smaller crystallites of the two alloy deposits, although having the same chemical content, exhibited a lower corrosion rate., U ovom radu je proučavan uticaj vrste rastvora za taloženje na mikrostrukturu i korozionu stabilnost prevlaka Zn-Co legura. Zn-Co legure sa istim sadržajem Co su elektrohemijski taložene iz hloridnih rastvora sa različitim sadržajem jona kobalta, kao i iz sulfatno-hloridnog rastvora. Morfologija površine prevlaka je ispitivana skenirajućom elektronskom mikroskopijom i mikroskopijom atomskih sila. Koroziona stabilnost prevlaka Zn-Co legura je određivana praćenjem promene potencijala otvorenog kola sa vremenom delovanja rastvora NaCl koncentracije 3%, kao i polarizacionim merenjima. Dobijeni rezultati su pokazali značajan uticaj vrste rastvora za taloženje na morfologiju i korozionu stabilnost prevlaka Zn-Co legura. Prevlake Zn-Co legura dobijene iz hloridnih rastvora su homogene, dok su prevlake dobijene iz sulfatno-hloridnog rastvora nehomogene. Koroziona stabilnost prevlaka legura dobijenih iz oba hloridna rastvora je veća u odnosu na stabilnost legura dobijenih iz sulfatno-hloridnog rastvora. Povećanjem sadržaja kobalta u hloridnom rastvoru za taloženje dobijaju se prevlake manjih kristalita i u radu je pokazano kako veličina kristalita utiče na korozionu stabilnost legura sa istim sadržajem kobalta.", publisher = "Serbian Chemical Society, Belgrade", journal = "Journal of the Serbian Chemical Society", title = "Microstructure and corrosion behaviour of Zn-Co alloys deposited from three different plating baths, Mikrostruktura i koroziono ponašanje Zn-Co legura taloženih iz sulfatnog i hloridnih rastvora", pages = "1550-1537", number = "11", volume = "76", url = "https://hdl.handle.net/21.15107/rcub_technorep_1796" }
Bajat, J., Stevanović, S.,& Jokić, B.. (2011). Microstructure and corrosion behaviour of Zn-Co alloys deposited from three different plating baths. in Journal of the Serbian Chemical Society Serbian Chemical Society, Belgrade., 76(11), 1537-1550. https://hdl.handle.net/21.15107/rcub_technorep_1796
Bajat J, Stevanović S, Jokić B. Microstructure and corrosion behaviour of Zn-Co alloys deposited from three different plating baths. in Journal of the Serbian Chemical Society. 2011;76(11):1537-1550. https://hdl.handle.net/21.15107/rcub_technorep_1796 .
Bajat, Jelena, Stevanović, Sanja, Jokić, Bojan, "Microstructure and corrosion behaviour of Zn-Co alloys deposited from three different plating baths" in Journal of the Serbian Chemical Society, 76, no. 11 (2011):1537-1550, https://hdl.handle.net/21.15107/rcub_technorep_1796 .