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Potentiodynamic technique
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Proceedings Papers
Carolina Soares, Fábio Edson Mariani, Galtiere Corrêa Rêgo, Gustavo Satoru Takeya, George Edward Totten ...
HT2017, Heat Treat 2017: Proceedings from the 29th Heat Treating Society Conference and Exposition, 474-479, October 24–26, 2017,
Abstract
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In the present study unalloyed spheroidal graphite iron was compared with a sample alloyed with copper and nickel (Cu- Ni). Samples of those materials were treated in salt bath (a composite of sodium borate, aluminum, iron-niobium and/or iron-vanadium) at 1000 °C for 2 hours. This resulted in layers of niobium carbide (NbC), vanadium carbide (VC) and ternary carbide of niobium and vanadium (NbVC2). Characterization of these layers was obtained by optical microscopy, X-ray diffraction and microhardness Vickers. The microhardness and the thickness results were statistically analyzed by the two factors variance analysis method. The efficiency of the layered surface in increasing corrosion resistance was demonstrated by submitting it to potentiodynamic polarization corrosion tests.