Role of Al2O3 inclusions on the localized corrosion of Q460NH weathering steel in marine environment

Liu, Chao; Revilla, Reynier I.; Zhang, Dawei; Lutz, Alexander; Zhang, Fan; Zhao, Tianliang; Ma, Hongchi; Li, Yong; Terryn, Herman

doi:10.1016/j.corsci.2018.04.007

Cited by 154 publications

(59 citation statements)

References 49 publications

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“…It could be observed from Figure 3a,d that corrosion originated from local corrosion, and then propagated to the whole surface for the two different deoxidized steels. Further observation showed that the local areas of corrosion origin were in the positions of inclusions, confirming that inclusions were the root of corrosion in microalloyed steels [8,9,10]. Therefore, it is necessary to identify the characteristic of inclusions to elucidate the original corrosion mechanism.…”

Section: Resultsmentioning

confidence: 97%

“…Corrosion in steels normally originates from local corrosion, and then propagates to the whole surface. The heterogeneous microstructural features, such as grain boundaries, second phases, dislocations, and inclusions, particularly sulfide inclusions, are the origin of local corrosion [1,2,3,4,5,6,7,8,9,10,11,12,13]. Therefore, many researchers have conducted research to elucidate the effects of inclusions on local corrosion to minimize their negative impacts [3,4,5,6,7,8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

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Mechanism Understanding of the Role of Rare Earth Inclusions in the Initial Marine Corrosion Process of Microalloyed Steels

Tang

Liu

et al. 2019

Materials

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In this study, the corrosion behavior of rare earth (RE) microalloyed steels was first evaluated through potentiodynamic polarization tests and corrosion weight loss experiments, and then the corrosion morphologies were observed by scanning electron microscope (SEM). After immersion in a NaCl solution, the sulfides (or oxygen sulfides) dissolved preferentially, followed by corrosion at the boundary between the Fe matrix and oxides. Afterwards, the inclusions fell off as a whole, which promoted pitting nucleation. The first principle modeling demonstrated that the work functions of various kinds of inclusions descended in the following order: La2Zr2O7 > LaAlO3 > (La2O3 ≈ Fe ≈ La2O2S) > La2S3, which provided a theoretical explanation to the dissolution behaviors of inclusions. That is, inclusions containing sulfur tend to dissolve preferentially, whereas the oxides do not dissolve easily. Subsequently, the surface current distributions were detected by the scanning vibrating electrode technique (SVET), which provided more microscopic insight into the role of inclusions in the corrosion propagation. Results showed that the active sites of pitting nucleation accelerated the transverse propagation of corrosion. Finally, local corrosion spread to the whole surface as uniform corrosion.

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Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Mechanism Understanding of the Role of Rare Earth Inclusions in the Initial Marine Corrosion Process of Microalloyed Steels

Tang

Liu

et al. 2019

Materials

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“…Based on the above results and relevant previous studies [28][29][30][31], a schematic of the corrosion product film on the 12Cr1MoV steel after corrosion in the TCSA solution is proposed, as is shown in Figure 9. In the early stage (1-3 d), there is a competitive adsorption of OH -, AlO2 -, and S2O3 2-in the solution.…”

Section: Corrosion Mechanismmentioning

confidence: 89%

Initial Corrosion Behavior of 12Cr1MoV Steel in Thiosulfate-Containing Sodium Aluminate Solution

Yuan

Chen

et al. 2020

Metals

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When alumina is produced by the Bayer process with high-sulfur bauxite, the sulfur would strongly corrode the 12Cr1MoV steel made heat exchanger. This study investigated the initial corrosion behavior of the 12Cr1MoV steel exposed to a thiosulfate-containing sodium aluminate (TCSA) solution under the evaporation conditions of alumina production. The obtained corrosion rate equation is V = 6.306·t·exp(−0.71). As corrosion progressed, with the corrosion product film growing, the corrosion current density declines slowly, and the corrosion resistance of the steel is increased. At 1–3 days, the corrosion product film consisted of FeO, Fe2O3, and FeOOH. S2O32− lead to corrosion in local areas of the steel and pits appeared. AlO2− is transformed into Al(OH)3 and filled in the corrosion pits. At 4 and 5 days, Fe3O4 is generated in the outermost layer, and Al(OH)3 is shed from the corrosion pits. The corrosion mechanism of 12Cr1MoV steel in a TCSA solution is proposed based on the experimental results.

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“…These studies typically involve electrochemical measurement [ 9 , 10 ], characterization of typical corrosion morphologies [ 11 ] and numerical modeling [ 12 ]. The past studies in literature reveal that the inclusions in steel play a critical role in the pitting initiation [ 13 , 14 , 15 ]. Reactions tend to occur preferentially around the inclusions, probably due to the potential difference between the inclusion and the matrix, which was demonstrated by some scholars using advanced surface measurement techniques such as scanning Kelvin probe force microscopy [ 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Multiscale Statistical Analysis of Massive Corrosion Pits Based on Image Recognition of High Resolution and Large Field-of-View Images

Wang

Tian

2020

Materials

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In the present study, a new multiscale method is proposed for the statistical analysis of spatial distribution of massive corrosion pits, based on the image recognition of high resolution and large field-of-view (montage) optical images. Pitting corrosion for high strength pipeline steel exposed to sodium chloride solution was observed using an optical microscope. Montage images of the corrosion pits were obtained, with a single image containing a large number of corrosion pits. The diameters and locations of all the pits were determined simultaneously using an image recognition algorithm, followed by statistical analysis of the two-dimensional spatial point pattern. The multiscale spatial distributions of pits were analyzed by dividing the montage image into a number of different windows. The results indicate the clear dependence of distribution features on the spatial scales. The proposed method can provide a better understanding of the pit growth from the perspective of multiscale spatial evolution.

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Role of Al2O3 inclusions on the localized corrosion of Q460NH weathering steel in marine environment

Cited by 154 publications

References 49 publications

Mechanism Understanding of the Role of Rare Earth Inclusions in the Initial Marine Corrosion Process of Microalloyed Steels

Mechanism Understanding of the Role of Rare Earth Inclusions in the Initial Marine Corrosion Process of Microalloyed Steels

Initial Corrosion Behavior of 12Cr1MoV Steel in Thiosulfate-Containing Sodium Aluminate Solution

Multiscale Statistical Analysis of Massive Corrosion Pits Based on Image Recognition of High Resolution and Large Field-of-View Images

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