Taxonomy for protective ability of rust layer using its composition formed on weathering steel bridge

Hara, Shuichi; Kawamata, Takayuki; Harada, Miyuki; Yamashita, Masato

doi:10.1016/j.corsci.2006.06.016

Cited by 151 publications

(87 citation statements)

References 13 publications

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“…A greater presence of akaganeite was reflected in the values of the protective ability indexes PAI α and PAI β . The literature states [17,18] that a fully protective corrosion layer with a corrosion rate r corr < 10 µm·year −1 correspond to PAI α > 1. If the PAI α ratio < 1, calculation of the PAI β is necessary to determine another factor of the layer's protective ability (PAI β < 0.5-a corrosion product layer without protective ability; or PAI β > 0.5-partially protective corrosion layer).…”

Section: Discussionmentioning

confidence: 99%

“…In the corrosion products, compounds like magnetite Fe 3 O 4 or maghemite γ-Fe 2 O 3 are produced; in environments containing chlorine, it is also akaganeite β-FeOOH phase. The relative ratio of the main compounds and phases in the corrosion product layer can be used to determine the Protective Ability Index [17,18]. …”

Section: Experimental Tests For Monitoring the Deposition Rate Of Chlmentioning

confidence: 99%

“…Protective functionality expressed by indexes PA (protective ability indexes) can be assessed by comparing these ratios [17,18]. An X-ray diffraction analysis was also performed on the withdrawn samples of corrosion products and PA Index values were determined from the obtained phase composition; see Table 4.…”

Section: Chemical Composition Of Corrosion Productsmentioning

confidence: 99%

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Characterization of Corrosion Products on Weathering Steel Bridges Influenced by Chloride Deposition

Křivý

Kubzová

Kreislová

et al. 2017

Metals

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Abstract:The article presents the results of experimental testing of corrosion processes on weathering steel bridges. Two bridge structures spanning various obstacles were selected for the experimental measurement. The tested bridges are situated in the same location and structural solution of these bridges is similar. Differences in development of corrosion products are mainly affected by the microclimate below the bridge structure. Special attention is paid to a bridge over the motorway which is strongly affected by the deposition of chlorides. The dependences between the measured deposition of chlorides and parameters of corrosion layers (thickness of corrosion products, corrosion rates, and chemical composition) are discussed and evaluated in this article.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Tests For Monitoring the Deposition Rate Of Chlmentioning

confidence: 99%

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Characterization of Corrosion Products on Weathering Steel Bridges Influenced by Chloride Deposition

Křivý

Kubzová

Kreislová

et al. 2017

Metals

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“…Because the model remains in the second stage for the most of the total exposure period, we believe that corrosion resistance of carbon steels during a long-term exposure greatly depends on the rust as it serves as a medium for oxygen penetration. e long-term exposure test has shown that the corrosion rates for the rust components are less than 0.01 mm/yr, as shown in (1) [15,16]:…”

Section: Introductionmentioning

confidence: 99%

Effects of Alloying Elements (Cr, Mn) on Corrosion Properties of the High‐Strength Steel in 3.5% NaCl Solution

Kim

2018

Advances in Materials Science and Engineering

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Effects of chromium and manganese as alloying elements on corrosion resistance of carbon steel were examined using evaluation of corrosion resistance in 60°C NaCl solution with a weight loss test, polarization test, analysis of rust with X-ray diffractometer, Raman spectroscopy, transmission electron microscopy, energy dispersive spectroscopy, and electron energy loss spectroscopy.e weight loss behavior conformed to a typical parabolic law, and the oxidation state of iron in rust was higher along the fast pathway but was disproportionate to the distance from the alloy/AR interface. It suggests that the corrosion process of the alloys was controlled by transport of oxygen to the rust layer. e improvements in corrosion resistance of 18Mn and 18Mn5Cr resulted from both the refinement of grain in adherent rust (AR) and the increase of the amounts of goethite in nonadherent rust (NAR) by chromium and manganese. Especially, the effectiveness of chromium on corrosion resistance was also related to the refinements of grain in AR and the amounts of goethite in NAR. e Tafel extrapolation method was inadequate to measure the instantaneous corrosion rate of steels with various alloying elements and immersion periods because of the difference in electrochemical reduction rates of rust, depending on its constituent.

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“…The setup of the study consist of: (1) weighing the initial sample; (2) wetting the sample surface with 40 μL.cm -2 corrosive solution. The detailed corrosion process is summarized in Table 2; (3) drying the samples in a chamber maintained at 25°C and 60% RH for 12 h; (4) reweighing the sample after dried; (5) washing the sample with deionized water to prevent the accumulation of progressive salt; (6) repeating the above steps from (2) to (5).…”

Section: Wet/dry Cyclic Corrosion Test (Cct)mentioning

confidence: 99%

Atmospheric Corrosion Behavior of Weathering Steel in Periodically Changed Environment

et al. 2014

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The service environments of weathering steel are periodically various. However, the general accelerated corrosion test cannot effectively simulate the periodic change. In order to investigate the influence of periodic changed environments on corrosion, a low alloy weathering steel was exposed to an indoor air with NaCl and NaHSO3 aqueous solutions spraying the steel in turns. It was found that both atmospheric corrosion rate and the degree of alloy element enrichment in the inner rust layer were higher when the samples were sprayed with NaCl aqueous solution. Meanwhile, more compact rust layers were formed when the samples were sprayed with NaHSO3 aqueous solution. Rust layer would stabilize more rapidly by spraying NaCl and NaHSO3 aqueous solutions in turns than by spraying a single corrosion solution, which can be attributed to a combined advantage of alloy element enrichment and slow corrosion. Stabilization of rust layer is not necessarily derived from enrichment of alloy elements and stabilization of rust layer can produce stronger effect against further corrosion than enrichment of alloy elements.

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Taxonomy for protective ability of rust layer using its composition formed on weathering steel bridge

Cited by 151 publications

References 13 publications

Characterization of Corrosion Products on Weathering Steel Bridges Influenced by Chloride Deposition

Characterization of Corrosion Products on Weathering Steel Bridges Influenced by Chloride Deposition

Effects of Alloying Elements (Cr, Mn) on Corrosion Properties of the High‐Strength Steel in 3.5% NaCl Solution

Atmospheric Corrosion Behavior of Weathering Steel in Periodically Changed Environment

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