Role of inclusions in the pitting initiation of pipeline steel and the effect of electron irradiation in SEM

Wang, Yafei; Cheng, Guangxu; Wu, Wei; Li, Yun

doi:10.1016/j.corsci.2017.10.029

Cited by 52 publications

(23 citation statements)

References 74 publications

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“…Severe pitting corrosion was observed and most of the pits exhibited regular round shapes. As already demonstrated in our previous studies, the circular corrosion pits were initiated from spherical Al-Ca-O-S type inclusions [13]. Hundreds of pits were identified in Figure 3 with different sizes, implying that the pits were initiated at different times.…”

Section: Image Recognitionsupporting

confidence: 72%

“…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%

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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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Section: Image Recognitionsupporting

confidence: 72%

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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“…Ce oxides could not behave as an anode phase to create the acceleration effect on corrosion nucleation [31,32]. In a previous investigation, the pitting corrosion of rare earth metal (REM)-containing hyperduplex stainless steel did not initiate at REM oxides, improving the anti-corrosion property [12].…”

Section: Effect Of Cerium Addition On Pitting Nucleationmentioning

confidence: 97%

Effect of cerium on the initiation of pitting corrosion of 444-type heat-resistant ferritic stainless steel

Liu

Chen

2020

High Temperature Materials and Processes

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The 444-type heat-resistant ferritic stainless steel is widely utilized in automotive exhaust pipes and solid oxide fuel cells, due to its excellent properties at elevated temperature. To meet the demands of significantly harsh service environments, rare earths were added in 444-type ferritic stainless steel. For the purpose of evaluating the effect of rare earths on pitting corrosion initiation, the metastable pitting corrosion behavior in 444-type ferritic stainless steel was studied through potentiodynamic polarization and potentiostatic polarization tests. The results demonstrated that pitting corrosion was initiated at the inclusion/alloy interface. The cerium alloying in 444-type ferritic stainless steel decreased the amount of preferential dissolution sites. The beneficial effect of Ce on pitting corrosion resulted from the formation of stable cerium oxides, as well as from the reduction in the amount and size of inclusions in 444-type ferritic stainless steel. In addition, electrochemical impedance spectroscopy test results revealed that cerium alloying enhanced the polarization resistance of passive films through insignificant thickness alteration.

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“…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%

“…However, only a few studies have investigated the effect of RE microalloying on the corrosion behavior. RE elements, acting as microalloyed elements, can modify the type and property of inclusions due to their great affinity for oxygen and sulfur [8,30,31,32,33,34,35]. It has been reported that, with the doping of RE elements, the main types of inclusions change into RE sulfides, RE oxides, and RE oxygen sulfides [14,24,34,35,36,37,38].…”

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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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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Role of inclusions in the pitting initiation of pipeline steel and the effect of electron irradiation in SEM

Cited by 52 publications

References 74 publications

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

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

Effect of cerium on the initiation of pitting corrosion of 444-type heat-resistant ferritic stainless steel

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

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