Intergranular to Intragranular Pitting Corrosion Transition Mechanism of Sensitized AA5083 at 150 °C

Intergranular pitting corrosion of CoCrMo biomedical implant alloy.

CoCrMo samples of varying microstructure and carbon content were electrochemically corroded in vitro and examined by scanning electron microscopy and electron backscatter diffraction techniques. The rate of corrosion was minimized (80% reduction from icorr = 1396 nA/cm(2) to icorr = 276 nA/cm(2) ) in high-carbon CoCrMo alloys which displayed a coarser grain structure and partially dissolved sec...

Numerical Simulation of Material Strength Deterioration due to Pitting Corrosion

Pitting corrosion is an insidious form of localized corrosion a ecting characteristics of various engineering metallic alloys. Currently very limited literature exists with regard to systematic characterization of pitted surfaces or the efficient use of numerical methods to assess its effect, i.e. fatigue life reduction caused by the state of a corroded specimen and particularly through the stu...

Pitting Corrosion Monitoring Using Acoustic Emission

Inhibition Mechanism of Pitting Corrosion of Nickel in Aqueous Medium by Some Macrocyclic Compounds

Anodic polarization of nickel was studied by potentiostatic technique in neutral media in presence of two macrocyclic ligands. Pit initiation was detected by measuring pitting potential, Ep and the charge transfer, Q during the anodic polarization. Initiation of pitting and Q were found to be dependent on the structure and concentrations of inhibitors. Under steady state conditions, the inhibit...

Investigation of Intergranular Corrosion Propagation Promoted by Interactions between Sensitized Grain Boundaries using Closely Packed Electrode Arrays

Intergranular corrosion (IGC) can be defined as the phenomena in which the corrosion rate of the grain boundary is higher than that of the bulk grain body. Austenitic stainless steels can become “sensitized” to this type of corrosion when the bulk metal experiences a temperature excursion above that necessary to make chromium carbides dissolve. As the metal cools, chromium carbide preferentiall...