Role of inclusion and microstructure on corrosion initiation and propagation of weathering steels in marine environment

Wang, Zhihui; Zhang, Xian; Cheng, Lin; Liu, Jing; Wu, Kaiming

doi:10.1016/j.jmrt.2020.11.096

Cited by 50 publications

(16 citation statements)

References 45 publications

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“…The micropores were observed around the inclusion after 2 h of immersion ( Figure 9 d). The microcouples were found to be formed between the M/A constituents and the ferrite matrix, with the ferrite matrix acting as the anode phase and the M/A constituents as the cathode phase [ 15 , 46 ]. The M/A island gradually fell off with the corrosion dissolution of the ferrite matrix.…”

Section: Resultsmentioning

confidence: 99%

“…To investigate the effect of Cl − on the pitting initiation and propagation of composite inclusions by ex situ SEM observations in a simulated marine environment, a series of immersion tests (5 s, 1 min, 1 h and 2 h) were conducted. To better observe the pitting behavior of inclusions, the immersion test was conducted in 0.1 wt.% NaCl and the rust on the surface of the immersed sample was removed by using a solution of 50% HCl + 50% deionized water + 5 g/L C 6 H 12 N 4 [ 46 ]. An FE-SEM with EDS was used to analyze the local corrosion morphology of the specimens before and after rust removal.…”

Section: Methodsmentioning

confidence: 99%

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Local Corrosion Behaviors in the Coarse-Grained Heat-Affected Zone in a Newly Developed Zr–Ti–Al–RE Deoxidized High-Strength Low-Alloy Steel

et al. 2023

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Oxide metallurgy technology can improve the microstructure of a coarse-grained heat-affected zone (CGHAZ) but introduces extra inclusions. Local corrosion behavior of the CGHAZ of a Zr–Ti–Al–RE deoxidized steel was investigated in this work using theoretical calculations and experimental verification. The modified inclusions have a (Zr–Mg–Al–Ca–RE)Ox core claded by a CaS and TiN shell. CaS dissolves first, followed by the oxide core, leaving TiN parts. This confirms that the addition of rare earth can reduce lattice distortion and prevent a galvanic couple between the inclusions and the matrix, while the chemical dissolution of CaS causes localized acidification, resulting in the pitting corrosion initiation.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Local Corrosion Behaviors in the Coarse-Grained Heat-Affected Zone in a Newly Developed Zr–Ti–Al–RE Deoxidized High-Strength Low-Alloy Steel

et al. 2023

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“…The hardness value of the specimen of 80 HRB produces a microstructure comprised of ferrite and pearlite and indicates the diverse corrosion phenomenon [42]. In addition, the above microstructure phase accelerates the progress of corrosion, where the pearlite induces a faster speed of local corrosion [43]. The hardness test result also provides valuable information about active layer removal, which intensively protects the pipeline.…”

Section: Discussion Of Rca Analysis and Risk Modellingmentioning

confidence: 99%

Risk analysis of Ex-spool 16” mol: an insight of machine learning and experimental result

Aditiyawarman

Soedarsono

Kaban

et al. 2022

EEJET

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The paper reports the development of a Risk-Based Inspection (RBI)-Machine Learning perspective. The Optical Emission Spectrometry (OES), Tensile and Hardness Test, Scanning Electron Microscope (SEM), Energy Dispersive X-Ray Spectroscopy (EDS), Sulfate Reducing Bacteria Check, and X-Ray Diffraction (XRD) was used to analyze the root cause of the pipeline’s failure. Corrosion attack shows at the cross-section microstructure based on SEM results. Carbon, Manganese, Phosphorous, and sulfur’s chemical composition is dramatically lower than the standard API 5L Grade X42. Siderite and hematite dominate the composition of the corroded area as a result of CO2 dissolving in water. In contrast, hematite is generated due to the pipe and outdoor atmosphere reaction. Severe local wall thinning of the sand abrasion causes the degradation of the material’s mechanical properties and increases the corrosion rate. This result amplifies by the development of Machine Learning (ML) of Pearson Multicollinear Matrix and Supervised ML (Random Forest, Support Vector Machine, and Linear Regression) to estimate the corrosion degradation of the material. The source of datasets provided by ILI inspection includes the calculated PoF Remaining Useful Life (RuL) as input data, while Probability of Failure (PoF) prediction serves as output data. The Random Forest shows superior predictions of 92.18 %, with the lowest validation loss of 0.0316. The modeling result confirms the experimental outcome. This work demonstrates the implementation strategy to reduce the analysis time, minimize human bias, and serve as a reliable reference tool and guideline to maintain the integrity of the subsea pipelines.

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“…The spatial distribution of bainite is more homogeneous than pearlite. Therefore, bainite shows less electrochemical activity and tends to form a dense rust layer with small cracks [11].…”

Section: Corrosion Analysis Of Laterite Steel A588-1%nimentioning

confidence: 99%

“…Therefore, bainite shows a more stable electrochemical activity [11]. Hao et al observed the formation of micro-galvanic pairing between the lamellar cementite phase and ferrite phase, which increases the corrosion rate of ferrite-perlite steel in hydrochloric acid solution.…”

Section: Introductionmentioning

confidence: 99%

Effect of forging load and heat treatment process on the corrosion behavior of A588-1%NI for weathering steel application in a marine environment

Rohmah¹,

Paristiawan²,

Romijarso³

2022

Sinergi

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The study focused on the effect of forging load and heat treatment on the corrosion behavior of A588-1%Ni weathered steel. The samples used were hot forged steel (A588%-1%Ni) with a load of 50 tons and 75 tons at a temperature of 800-850 °C. The test sample was reheated at an intercritical temperature between A3–A1, around 780 °C, held for 1 hour, and then cooled to room temperature. The cooling media used are water, oil, and open air. Forging loads and heat treatment variation affect the microstructure and corrosion rate of A588-1%Ni. Based on the metallographic test and after the hot forging process, A588-1%Ni laterite steel has a microstructure as ferrite-perlite. Then, after heat treatment as ferrite and cementite-containing phase, pearlite, bainite, or martensite may very well. Cooling water delivers a uniformly distributed lath martensite with an acicular ferrite phase. In addition, the oil media creates bainite with an acicular ferrite phase coarser size. The open-air media produces a pearlite + ferrite phase. Corrosion behavior of laterite steel subjected to hot forging process and followed by heat treatment was evaluated in 3% NaCl solution. Oil cooling with bainite-ferrite microstructure has the lowest corrosion rate, which is 11.96x10-3 mmpy.

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Role of inclusion and microstructure on corrosion initiation and propagation of weathering steels in marine environment

Cited by 50 publications

References 45 publications

Local Corrosion Behaviors in the Coarse-Grained Heat-Affected Zone in a Newly Developed Zr–Ti–Al–RE Deoxidized High-Strength Low-Alloy Steel

Local Corrosion Behaviors in the Coarse-Grained Heat-Affected Zone in a Newly Developed Zr–Ti–Al–RE Deoxidized High-Strength Low-Alloy Steel

Risk analysis of Ex-spool 16” mol: an insight of machine learning and experimental result

Effect of forging load and heat treatment process on the corrosion behavior of A588-1%NI for weathering steel application in a marine environment

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