Corrosion of the Heat-Affected Zones (HAZs) of API-X100 pipeline steel in dilute bicarbonate solutions at 90 °C – An electrochemical evaluation

Eliyan, Faysal Fayez; Alfantazi, Akram

doi:10.1016/j.corsci.2013.05.003

Cited by 66 publications

(38 citation statements)

References 41 publications

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“…We can speculate that the activation of erosion due to the Cl − adsorbed on the metal surface, and Fe 2+ dissolved from the anode, unites with Cl − to form FeCl 2 ·4H 2 O, and then generate Fe(OH) 2 . However, the Fe(OH) 2 was not stable, and would gradually break down into FeO or combine with O 2 in water to form FeOOH [16,20,21]. Finally, the oxygen content of the UUSQ sample is significantly increased compared with USQ sample, indicating that ultrasonic quenching can improve the corrosion resistance of steel in a seawater environment.…”

Section: Corrosion Products and Corrosion Mechanism Analysismentioning

confidence: 90%

Effects of Ultrasonic-Aided Quenching on the Corrosion Resistance of GB 35CrMoV Steel in Seawater Environment

Jiang

Zhou

Chen

et al. 2018

Metals

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Abstract:The effects of ultrasonic-aided quenching (USQ) on the microstructure and corrosion properties of 35CrMoV steel in a simulated seawater environment (wt % (NaCl) = 3.5) were studied. The corrosion properties of the steel were studied by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to characterize the microstructure and corrosion products. Combined with the EIS equivalent circuit, the corrosion mechanism was investigated. The results show that the microstructure of the USQ specimen is small martensite and that there was no residual ferrite compared with an un-ultrasonic-aided quenching (UUSQ) sample. It was also found that the corrosion products of USQ sample are less than the UUSQ sample, and the corrosion cracks are lighter and thinner than that of the UUSQ sample, which indicates that the corrosion resistance of 35CrMoV in a seawater environment has been obviously improved.

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Section: Corrosion Products and Corrosion Mechanism Analysismentioning

confidence: 90%

Effects of Ultrasonic-Aided Quenching on the Corrosion Resistance of GB 35CrMoV Steel in Seawater Environment

Jiang

Zhou

Chen

et al. 2018

Metals

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“…For instance, the electrochemical reactions that govern the anodic and cathodic reactions are influenced by the presence of bicarbonate [38]. In particular, the mechanism of corrosion reactions on the exterior surface of buried structures when exposed to hydrated conditions containing carbon transporting agents are as follows [39] …”

Section: Corrosion In Buried Metal Structuresmentioning

confidence: 99%

Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Arriba-Rodriguez

Balsera

Fernández

et al. 2018

Metals

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Around the world, there are thousands of metal structures completely or partially buried in the soil. The main concern in their design is corrosion. Corrosion is a mechanism that degrades materials and causes structural failures in infrastructures, which can lead to severe effects on the environment and have direct impact on the population health. In addition, corrosion is extremely complex in the underground environment due to the variability of the local conditions. The problem is that there are many methods to its evaluation but none have been clearly established. In order to ensure the useful life of such structures, engineers usually consider an excess thickness that increases the economic cost of manufacturing and does not satisfy the principles of efficiency in the use of resources. In this paper, an extended revision of the existing methods to evaluate corrosion is carried out to optimize the design of buried steel structures according to their service life. Thus, they are classified into two categories depending on the information they provide: qualitative and quantitative methods. As a result, it is concluded that the most exhaustive methodologies for estimating soil corrosion are quantitative methods fed by non-electrochemical data based on experimental studies that measure the mass loss of structures.

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“…The history of the biodiesel industry reveals a significant number of faults (holes in pipes) caused by corrosion in acidic medium, that cause production losses and, consequently, economic losses. Although several studies related to the effect of heat input and thermal cycles on the microstructure of pipeline steels have been performed [1][2][3]8,9], there are few studies related to corrosion of LDSS in biodiesel plants. The weldability of this type of duplex steel is generally good when using slightly overalloyed filler metal as ISO 2307 N L or ISO 2209 N L [1].…”

Section: Introductionmentioning

confidence: 99%

Use of the Electrochemical Microcell Technique for Studying Pitting Corrosion at Welded Joints of Lean Duplex Stainless Steel Uns S32304

Sicupira¹,

Júnior²,

Bracarense³

et al. 2019

ABM Proceedings

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A pitting corrosion study of welded joints of lean duplex stainless steel (LDSS) UNS S32304 has been performed. LDSS S32304 thick plates were welded by different processes commonly employed in equipment and piping construction: SMAW (Shielded metal arc welding), GMAW (Gas metal arc welding) and FCAW (Flux cored arc welding). The electrochemical behavior of different weldment zones (fusion zone (FZ), base metal (BM) and heat affected zone (HAZ)) was characterized both independently using an electrochemical microcell and together through whole sample analysis. The electrochemical method applied was performed in acidified glycerin, a process fluid of the biodiesel industry. The results were correlated to the microstructural features of the materials. Based on the results, is possible to conclude that the breakdown potential (E b ) of the fusion zone (FZ) was higher than the E b obtained for the heat affected zone (HAZ). In general, top samples show higher breakdown potential than root samples and also the samples welded using filler metal 2209 has a better anodic behavior than the filler metal 2307. According to the results, GMAW welding process with 2209 as filler metal was revealed as the optimum chosen for application of 2304 duplex stainless steels in this case.

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Corrosion of the Heat-Affected Zones (HAZs) of API-X100 pipeline steel in dilute bicarbonate solutions at 90 °C – An electrochemical evaluation

Cited by 66 publications

References 41 publications

Effects of Ultrasonic-Aided Quenching on the Corrosion Resistance of GB 35CrMoV Steel in Seawater Environment

Effects of Ultrasonic-Aided Quenching on the Corrosion Resistance of GB 35CrMoV Steel in Seawater Environment

Methods to Evaluate Corrosion in Buried Steel Structures: A Review

Use of the Electrochemical Microcell Technique for Studying Pitting Corrosion at Welded Joints of Lean Duplex Stainless Steel Uns S32304

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