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  • Corrosion stability of bronze patinas and its versatile protection = Korozijska stabilnost patin in različnih zaščit na bronu
    Kosec, Tadeja ...
    Copper alloy-bronze tends to form an oxide layer in humid air. The patina layer protects bronze from further corrosion process. Patina can be formed as natural process or it can be formed ... artificially. The artists use special patination procedures for visual effects. In many cases there is a need to postpone the corrosion process. In this case the surface is brushed, sprayed or wiped with natural, synthetic or microcrystalline waxes that are sometimes doped with organic inhibitors. The aim of the present study is to test the stability of electrochemical and chemically formed patina, together with many possible ways of protection. Different green-to-blue colour patinas were chosen to be tested. Electrochemically formed patina was obtained by potentiostatic polarization during 55h. Green chemically formed patinas were applied with a hot dip technique. Final finishes that were tested were: benzotriazole and healthly less hazardous imidazole type inhibitor, waxes and laquers with added inhibitors. Some organic mixtures, such as Polaroid B44, common finish for bronze sculptures are tested. The mechanism of prevention iscompared. The mechanism of aging of bronze is determined in a test solution of acid rain (0.2 g/L Na[sub]{2}SO[sub]4, 0.2 g NaNO[sub]3 and 0.2 g/L NaHCO[sub]3 acidified to pH5). A classic electrochemical approach is used to study corrosion behaviour of bronze with a similar compositions as statues nowadays. The untreated and pre-treated surfaces are investigated with different electrochemical techniques: corrosion potential, linear polarization, potentiodynamic measurements and electrochemical impedance spectroscopy. The structures of the patina and corrosion products after electrochemical tests are characterized by scanning electron microscopy (SEM). The use of different ways of protecting unprotected and pre-patinated surfaces is compared in order to efficiently protect bronze surfaces for outdoor applications.
    Vir: Program in knjiga povzetkov = Program and book of abstracts (Str. 73)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2009
    Jezik - angleški, slovenski
    COBISS.SI-ID - 785578

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