EFFECT OF VELOCITY ON GALVANIC CORROSION OF AL-ALLOYS

The effect of relative velocity metal/electrolyte on galvanic corrosion was studied for Al 6061 coupled to Cu, 4340 steel, Type 304 stainless steel, Ti-6Al-4V, and Zn in 3. 5% NaCl and in substitute ocean water. The electrodes were in the form of cylinders, which were mounted on an electrode holder previously described in the literature. Anodic and cathodic polarization curves were measured as a function of velocity. From these curves, the limiting current density for oxygen reduction was determined, and a linear relationship with the square root of velocity was observed.