EIS study on corrosion evolution of chemical quenched rebar in concrete contaminated with chloride

Abstract

The corrosion evolution of scaled rebar cooled by a chemical reagent FM in concrete immersed in 3?5%NaCl aqueous solution was studied by electrochemical impedance spectra and compared with bare rebar. The results show that the corrosion evolution process of FM cooled rebar consists of three stages during the immersion: the passive stage, the accelerated corrosion stage dominated through the charge transfer step and the steady corrosion stage dominated through the mass transfer step. The corrosion rate of FM cooled rebar reaches a steady rate (,0?7 mA cm 22 ) after 80 days. However, the corrosion rate of bare rebar always increases at all immersion times. After immersion for y1 year, the corrosion rate of bare rebar is nine times larger of that of FM cooled rebar. Therefore, the corrosion resistance of the rebar has been improved significantly by applying the FM cooling process.

Corrosion of Tail Heated Surface Tube under Flue Gas Medium in LNG Power Station HRSG

“…The rock candy shape, intergranular rupture and secondary cracks were observed on the 76 2013 International Conference on Process Equipment, Mechatronics Engineering and Material Science crack fracture. Such features of the cracks were consistent with macroscopic and microscopic morphological properties of SCC [14] . No fatigue striation was found on the crack surface.…”

“…Since the LNG power station was located at a coastal acid rain region, it can be determined that 2 elements were from atmospheric environment. Both SO x and Clhave a significant impact on SCC for carbon steel-carbonate system according to literature [13][14][15], such as rising dewpoint of the flue gas, spuring SCC, and so on. However, their effects under the flue gas medium in LNG power station were still needed more researches.…”

“…For example, Clhas no impact on carbon steel SCC in carbonate medium, but with small amount of HS, it will facilitate carbon steel SCC [13] . Clwould impose corrosion inhibition on carbon steel+NO 3 system [14] . Even at low SO x concentrations in the flue gas, the dewpoint of the flue gas will be significantly rised [15] .…”

Anticorrosion Behaviour ofRhizophora mangleL. Bark-Extract on Concrete Steel-Rebar in Saline/Marine Simulating-Environment

“…In the past decade, numerous studies have deliberated on corrosion problems that are encountered from the in-service environments for steel-reinforced concrete applications [9–30]. These studies lend supports to the knowledge that the environments for steel-reinforced concrete attacks constitute the acidic [9, 12, 16, 30], alkaline [11, 15, 17, 23] and neutral [14, 18, 29] media, wherein environmental agents such as carbonation [20, 25, 28], chloride ions [10, 19, 21, 24], and sulphate ions [9, 13, 17] effects are indicated for the corrosion degradation mechanisms against steel-in-concrete. These have engendered monitoring techniques [26, 27] and solution approaches [20, 22, 29], over the years, for assessing and/or addressing different modes of reinforcing-steel corrosion in concrete.…”

Testing phosphate ions as corrosion inhibitors for construction steel in mortars

“…The circuit in 2b includes a Warburg element associated to finite length diffusion that could be related to diffusion through a finite rust layer [32,41].…”