Experimental Design in the Study of Galvanic Corrosion: a Resource for Complex Electrochemical Environment

摘要

The behavior of galvanic corrosion between carbon steel and CuAlBe with Shape Memory Effect was investigated using the technique of Zero Resistance Amperometry (ZRA), in an electrolytic environment that simulates the water produced from mature oil fields. For this purpose, we used a fractional factorial design 2~(6-2) + 6 central points with the following variables: Cl~-, SO_4~=, S~=, HCO_3~-, ratio of anodic area to cathodic area (1:1, 1:1/2, 1:1/4) and temperature (25, 35 and 45°C), where the dependent variable was the galvanic current density measured after 12 h. The results on the response surfaces show evidence of passivation and depassivation, as seen in the nonlinear shape observed in the figures. Therefore, using an experimental design it is possible to study complex chemical equilibrium.