Electrochemical deposition and characterization of zinc-nickel alloys deposited by direct and pulse current

Abstract

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.