Electrochemical deposition and characterization of zinc-nickel alloys deposited by direct and pulse current
Elektrohemijsko taloženje i karakterizacija legura cink-nikal dobijenih konstantnom i pulsirajućom strujom
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Chemical composition and phase structure of Zn-Ni alloys obtained by electrochemical deposition under various conditions were investigated. The alloys were deposited on a rotating disc electrode and steel panel from chloride solutions by direct and pulse current. The influence of the pulse plating variables (on-time, off-time, relation of off- and on-time) on the composition, phase structure and corrosion properties were investigated. The phase composition affects the anticorrosive properties of Zn-Ni alloys during exposure to a corrosive agent (3% NaCl solution). It was shown that a Zn-Ni alloy electrodeposited by pulse current with a pulse time of 1 ms and an off- and on-time ratio of 1 exhibits the best corrosion properties.
Ispitivani su hemijski sastav i fazna struktura legura Zn-Ni dobijenih primenom različitih parametara elektrohemijskog taloženja. Legure su taložene iz hloridnog rastvora na rotirajućoj disk elektrodi i na čeličnim pločicama konstantnom i pulsirajućom strujom. Ispitivani su parametri pulsirajućeg taloženja (katodnog vremena, vremena pauze i odnosa pauze i katodnog vremena) na sastav, faznu strukturu i korozione osobine legura. Pokazano je da fazni sastav utiče na antikorozione osobine Zn-Ni legura tokom izlaganja dejstvu rastvora 3% NaCl. Legura Zn-Ni dobijena pulsirajućim taloženjem sa katodnim vremenom od 1 ms i odnosom pauze i pulsa od 1 ima najbolje korozione osobine.
Keywords:
Zn-Ni alloy / electrodeposition / pulse current / ALSV / corrosionSource:
Journal of the Serbian Chemical Society, 2002, 67, 8-9, 625-634Publisher:
- Serbian Chemical Society, Belgrade