Liquid crystals screens:Corrosion behavior of a new stainless steel with low nickels in alkaline solutions based on calcium hydroxide

International Seminars of Frontiers in Materials Science UPM-CIE Moncloa

06/02/2013

Title: Corrosion behavior of a new stainless steel with low nickels in alkaline solutions based on calcium hydroxide

Date: Monday 11th February 2013 at 09:30

Place: E.T.S. Civil Engineering, basement 1

Speaker: Santiago Farjado

Free admission



Summary

Reinforced concrete structures (RCS) normally present a great corrosion resistance. The highly alkaline media, such as that contained in the pores of the concrete (pH about 12-13) promotes the formation of a protective oxide layer on the surface of the steel used as reinforcement that prevents it from corrosion. However, the presence of chlorides can lead to damaging effects on passivity and the appearance of localized pitting corrosion when chloride ions reach the metal/concrete interface. In addition to this phenomenon, carbonation processes over the solution contained into the pores of the concrete causes severe corrosion problems due to a drop in pH. Because of these circumstances, stainless steel began to be used as reinforcing material in RCS in places where carbon steel presented protection deficiencies. The stainless steels most frequently used as reinforcement are the austenitic types AISI 304 and AISI 316.

Previous works have shown that both of them present a very good corrosion resistance in chloride contaminated media, between mortars as much as simulated pore solutions.Nickel is one of the alloying elements that significantly increases the cost of austenitic stainless steels. For this reason, new stainless steels, in which the nickel content is partly replaced by other elements, are being. Thus, a study on the corrosion behavior of a new low-nickel stainless steel has been carried out in order to evaluate its possible use as reinforcement in RCS.



Further information and contact details:
Dr. José Ygnacio Pastor, Organizer and Coordinator Scientific
Department of Material Science. Universidad Politecnica de Madrid
E.T.S. Civil Engineering, First Floor. Profesor Aranguren Road, E28040–Madrid
T. (+34) 913 366 684. F. (+34) 913 366 680. jypastor@mater.upm.es

Tag: Materials for the Future    Source: Universidad Politécnica de Madrid

Event date:

11/02/2013 - 11/02/2013