Feasibility of utilizing 2304 duplex stainless steel rebar in seawater concrete: Passivation and corrosion behavior of steel rebar in simulated concrete environments

Abstract

The feasibility of using 2304 duplex stainless steel rebar in seawater concrete was determined by studying the passivation and corrosion behavior of steel in solutions simulated curing and service stage of concrete, respectively. The results demonstrate that 2304 duplex stainless steel rebar could be used with seawater concrete because of a stable passive film formed on the steel surface during the curing stage of concrete even in the presence of 2 M chloride ions. However, due to the synergistic effect of concrete carbonation, the rebar suffered a corrosive attack by chloride due to the lack of OH− inhibition.

A review of recent advances in the science and technology of seawater-mixed concrete

“…No corrosion was also detected on 304L and 23-04 stainless steel embedded in seawater-mixed concrete of a culvert prototype, subjected to wetting and drying and deicing salts for about one year [78,79]. The feasibility of the 23-04 grade in seawater-mixed concrete was also assessed through tests in simulated pore solution, which however, might not be adequate to predict corrosion behaviour in concrete [86].…”

Suitability of using simulated porous‐like solutions to evaluate the steel corrosion in carbonated concrete

“…Since then, several solutions have been proposed to simulate the carbonated pore solution of concrete. Most of them consist of mixtures of sodium carbonate and bicarbonate, [16][17][18][19][20][21][22][23][24][25][26][27][28][29] but the addition of potassium carbonate and bicarbonate was also investigated. [21] Other authors used saturated Ca(OH) 2 solution with the addition of sodium bicarbonate.…”

A Novel Self-Healing Conversion Film Formed on Rebar in Solution Containing Cerium and Molybdenum Ions

“…At present, two main methods are used for enhancing the corrosion resistance of rebars. One is to prepare an organic or galvanic coating on the surface, 10,11 and the other is to replace it with stainless steel rebars 12,13 For the organic coating, its adhesion to rebars would gradually degrade in a high-pH concrete environment. As a sacrificial anode, a galvanic coating would provide protection for a given period, and the loose corrosion product would decrease the interface bonding between rebars and concrete.…”