Passive behaviour of alloy corrosion-resistant steel Cr10Mo1 in simulating concrete pore solutions with different pH

Ai, Zhiyong; Jiang, Jinyang; Sun, Wei; Song, Dandan; Ma, Han; Zhang, Jianchun; Wang, Danqian

doi:10.1016/j.apsusc.2016.07.142

Cited by 89 publications

(37 citation statements)

References 36 publications

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“…Solutions with pH 12.0, 10.5, and 9.0 were prepared by addition of NaHCO 3 powder into the 0.03 M Ca(OH) 2 (saturated) solution (pH about 12.5), to simulate the carbonated or less alkaline concrete pore solutions [14], which could have low pH values even close to 9.0 [15]. The pH of the solutions was carefully checked and monitored throughout by a pH meter (Thermo Scientific Orion pH 2100, Thermo Fisher Scientific, Waltham, MA, USA).…”

Section: Methodsmentioning

confidence: 99%

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Sun

Jiang

et al. 2016

Materials

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The electrochemical behaviour for passivation of new alloy corrosion-resistant steel Cr10Mo1 immersed in alkaline solutions with different pH values (13.3, 12.0, 10.5, and 9.0) and chloride contents (0.2 M and 1.0 M), was investigated by various electrochemical techniques: linear polarization resistance, electrochemical impedance spectroscopy and capacitance measurements. The chemical composition and structure of passive films were determined by XPS. The morphological features and surface composition of the immersed steel were evaluated by SEM together with EDS chemical analysis. The results evidence that pH plays an important role in the passivation of the corrosion-resistant steel and the effect is highly dependent upon the chloride contents. In solutions with low chloride (0.2 M), the corrosion-resistant steel has notably enhanced passivity with pH falling from 13.3 to 9.0, but does conversely when in presence of high chloride (1.0 M). The passive film on the corrosion-resistant steel presents a bilayer structure: an outer layer enriched in Fe oxides and hydroxides, and an inner layer, rich in Cr species. The film composition varies with pH values and chloride contents. As the pH drops, more Cr oxides are enriched in the film while Fe oxides gradually decompose. Increasing chloride promotes Cr oxides and Fe oxides to transform into their hydroxides with little protection, and this is more significant at lower pH (10.5 and 9.0). These changes annotate passivation characteristics of the corrosion-resistant steel in the solutions of different electrolyte.

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Section: Methodsmentioning

confidence: 99%

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Sun

Jiang

et al. 2016

Materials

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“…Therefore, the high‐resolution XPS depth spectra of Cr 2p 3/2 and Fe 2p are particularly shown in this study (Figures and ). On the basis of the binding energies reported in the literature, Cr 2p 3/2 spectra can be classified into three contributions: metallic Cr (Cr 0 574.1 eV), Cr III oxide (Cr 2 O 3 576.3 eV) and hydroxide form (CrOOH/Cr(OH) 3 577.3 eV), whereas the Fe 2p 3/2 signal is separated into four peaks: Fe 0 (706.8 eV), FeO (709.5 eV), Fe 2 O 3 (710.7 eV), and FeOOH (711.8 eV).…”

Section: Resultsmentioning

confidence: 99%

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

Shang

Meng

et al. 2019

Materials & Corrosion

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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.

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“…Therefore, to ensure that the concrete is made more durable, it is very important to control the cover thickness in situ. (c) 26 28 30 After curing in situ, the compressive strength and rebound strength of the casting concrete specimens (100 mm × 100 mm × 100 mm) used in the marine and land sections were measured by a compression-testing machine and rebound hammer, respectively. As shown in Figure 4, the linear relationships between the compressive strength and the average rebound strength of the concrete Appl.…”

Section: Concrete Cover Thickness and Compressive Strengthmentioning

confidence: 99%

“…A new type of corrosion-resistant reinforced bar, Cr10Mo1 alloy, was used in the cross-sea section of the concrete bridge, as shown in Figure 1. The new type of reinforced bar is alloyed with about wt.10% Cr and wt.1% Mo, consisting of granular bainite with ferrite between the grains, and was developed by Southeast University [26]. Laboratory tests showed that the Cr10Mo1 reinforced bar has a critical chloride threshold level five times higher than that of carbon steel [27].…”

Section: Introductionmentioning

confidence: 99%

Service Life Prediction of Reinforced Concrete in a Sea-Crossing Railway Bridge in Jiaozhou Bay: A Case Study

Jin

Zhao

et al. 2019

Applied Sciences

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Reinforced bar corrosion induced by chloride ingression is one of the most significant threats to the durability of concrete structures in marine environments. The concrete cover thickness, compressive strength, chloride diffusion coefficient, and surface defects of reinforced concrete in the Jiaozhou Bay sea-crossing railway bridge were measured. The temperature and relative humidity in the concrete and the loading applied onto the reinforced concrete were monitored. Based on the DuraCrete model, a revised model for the service life prediction of concrete structures was established, considering the effects of temperature and loading on the chloride diffusion coefficient. Further, the reliability indexes of the reinforced concrete box girder, pier, and platform, located in the marine and land sections, in relation to service lives lasting various numbers of years, were calculated. The measured and calculated results show that the mean cover thicknesses of concrete piers in the marine and land sections are 52 mm and 36 mm, respectively, and the corresponding standard deviations are 5.21 mm and 3.18 mm, respectively. The mean compressive strengths of concrete in the marine and land sections are 56 MPa and 46 MPa, respectively. The corresponding standard deviations are 2.45 MPa and 2.67 MPa, respectively. The reliability indexes of the reinforced concrete box girder and platform in the marine section, under the condition of a service life of 100 years, are 1.81 and 1.76, respectively. When the corrosion-resistant reinforced bar was used in the pier structure in the marine section, its reliability index increased to 2.01. Furthermore, the reliability index of the reinforced concrete damaged by salt fog in the land section was 1.71. Appl. Sci. 2019, 9, 3570 2 of 18 in particular, those exposed to marine environments, has been recognized as an effective means to ensure the service life of concrete structures, which has been a focus of researchers and engineers all over the world [11][12][13].Service life prediction modeling has become one of the current major issues in the design of concrete structures. Using the third-moment method, Zhang [14] developed a time-dependent probability assessment for chloride-induced corrosion of RC structures. In order to provide corrective parameters for service life prediction, Li [15] investigated the time-dependent chloride penetration into concrete in marine environments. Considering the effect of the materials' heterogeneity when exposed to a marine tidal zone, Wang [16] developed a service life prediction model. Attari and Mcnally [17] explored a probabilistic assessment of the influence of the age factor on the service life prediction using concrete with limestone cement/ground granulated blast slag (GGBS) binders. Yu [18,19] developed a service life prediction model considering freeze-thaw fatigue, taking into account fly ash and slag. Hackl and Kohler [20] developed a reliability assessment which uses the coupled effect of corrosion initiation and progression to represent th...

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Passive behaviour of alloy corrosion-resistant steel Cr10Mo1 in simulating concrete pore solutions with different pH

Cited by 89 publications

References 36 publications

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

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

Service Life Prediction of Reinforced Concrete in a Sea-Crossing Railway Bridge in Jiaozhou Bay: A Case Study

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