SILVA, E. C. A.; http://lattes.cnpq.br/7051775605932881; SILVA, Edna Carla Araujo.
Resumen:
Corrosion has caused several damages to the environment as well as in the industries
because the process by which erode large buildings made of metal structures, can be seen
everywhere in the world, causing the accumulation of junk parts unusable for human
consumption. Given the serious problems caused by corrosion studies of metallic coatings
have been developed, especially in the area of electrochemistry. The low cost and high
durability in pieces obtained by electrodeposition have been gaining considerable space on the
production lines. Various alloys obtained by the electrodeposition process, such as Co-B
alloys exhibit high hardness, high gloss and high wear resistance. The amorphicity these
alloys has attracted a new class of materials that have excellent mechanical properties in order
that its alloys are light and have thin but high durability and corrosion resistance. The process
of obtaining not pollute the environment, consume small amounts of dissolved metals and
uses of electricity, for that reason has attracted the interest of big business and
environmentalists. In this work were developed Co-B alloys obtained by electrodeposition at
different current densities in galvanostatic mode with pH = 5.0. lts chemical evaluation as the
process of corrosion resistance, was carried out by the techniques of potentiodynamic linear
polarization (PLP) and Electrochemical Impedance Spectroscopy (EIS). It was observed that
the agitation affects the visual appearance of the samples showed more brilliant and uniform
electrodeposits. The eletrodepósito obtained at current density of 9,375mA/cm2 presents the
potential for corrosion resistance more positive than -0.155V according to PLP. The
formation of two arcs of impedance and 215311049 and 3.02xlOaQ confirms the result in
polarization. Analysis by dissolving couiume'trica This film presents two potential levels
suggesting the presence of boron in the alloy.