Passivation, pitting and stress corrosion cracking of High Strength Stainless Steel for prestressing structures in contact with alkaline media

Title: Passivation, pitting and stress corrosion cracking of High Strength Stainless Steel for prestressing structures in contact with alkaline media
Author(s): F.J. Recio, M.C. Alonso, P. Herrasti
Paper category : conference
Book title: 3rd International PhD Workshop on Modelling the Durability of Reinforced Concrete
Editor(s): R. M. Ferreira, J. Gulikers, C. Andrade
Print-ISBN: 978-2-35158-095-0
e-ISBN: 978-2-35158-094-3
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 92 - 99
Total Pages: 8
Nb references: 18
Language: English

Abstract: One alternative solution to increase the service life of prestessed structures in chloride environments is the replacement of conventional carbon steels by high strength stainless steel (HSSS) with higher resistance to pitting corrosion. But high strength stainless steels are also susceptible to local corrosion when exposed to high-polluted chloride media and suffer stress corrosion cracking, this last induced also by the service load. However lack of knowledge exists with respect to durability performance of this type of high strength stainless steel that claims for very basic and deep research before deciding its further use as prestressing tendons.
The behaviour of a high strength stainless steel has been evaluated by means of electrochemical techniques. The determination of characteristic parameters like current density (icorr), Epit (pitting potential), Erep (repasivation potential) has been determined and compared with the parameters obtained in conventional high strength carbon steels.
The results show the high resistance against pitting corrosion of high strength stainless steel type 1.4436 up to high chloride concentrations exposed to mechanical loaded and unloaded. The corrosion resistance decreases when the pH of the exposition media also does. Besides, an increasing of the temperature induces a decrease in the resistance to pitting corrosion.

Online publication: 2010-02-22
Publication type : full_text
Public price (Euros): 0.00