About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Fracture of Steels: New Approaches to Modeling and Experimental Characterization
|
Presentation Title |
Applied Potential Influence on Stress Corrosion Cracking Susceptibility of 316LN Stainless Steel Rebars in Simulated Concrete Pore Solution with Chlorides |
Author(s) |
Ulises Martin, Jacob Ress, Juan Bosch, David M. Bastidas |
On-Site Speaker (Planned) |
Ulises Martin |
Abstract Scope |
In this work, the influence of the applied potential on the corrosion and mechanical properties of the passive film of AISI 316LN stainless steel rebar is studied. The tests were performed under stress corrosion cracking conditions using a slow strain rate in simulated concrete pore solution contaminated with 4 wt.% Cl– at different applied potentials, both cathodic and anodic. At the applied potentials ‒100 and +100 mVOCP the passive film is developed until the residual and tensile stresses exceed the ultimate tensile stress, producing a ductile fracture. Higher anodic potential of +400 mVOCP increases dissolution kinetics and diminishes the mechanical material performance, in addition, chloride induced cracking is seen as torn grains in the ductile overload area, indicating TG‒SCC mechanism. Mainly brittle fracture is seen at +600 mVOCP, because the oxygen equilibrium line is cross promoting the OER; where TG‒SCC and branched IG‒SCC cracks are formed in the cleavage planes. |