Caustic Stress Corrosion Cracking of Mild Steel

Singbeil, Douglas; Tromans, Desmond

doi:10.1007/bf02643407

Cited by 55 publications

(44 citation statements)

References 18 publications

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“…In fact, these two theories were both testified valid under different environments [29], and we agree with it. In this event, the former one, i.e., the anodic dissolution of pits was preferred due to the autocatalytic occluded corrosion cell (OCC) effect when the pH value is in caustic region [30], seen in Equation (3).…”

Section: Icp-aessupporting

confidence: 68%

Acidic/caustic alternating corrosion on carbon steel pipes in heat exchanger of ethylene plant

Gong

Yang

Cheng

et al. 2011

Materials & Corrosion

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Caustic embrittlement, a kind of stress corrosion cracking (SCC), is always encountered on materials under stresses amid caustic environment. Acidic corrosion is another familiar degradation on materials contacting acidic media. However, it has been seldom studied what effect would be resulted in on materials that are exposed to an acidic/caustic alternating environment. In this paper, failure events were discovered on the carbon steel pipes under such an alternating service condition due to frequent sharp fluctuations of the heat medium's (process water) pH values in a heat exchanger. What is more, even chloride ions and sulfur element were detected, i.e., pitting corrosion was involved as well. In order to identify the causes of the failure, matrix materials of the pipes were examined, failure defects on pipe surfaces were investigated, particularly the process water was thoroughly inspected via a series of characterization methods. Based on the analysis results, a novel four-level mechanism from microscopic scale to macroscopic scale was tentatively proposed to explain such an acidic/caustic alternating corrosion.

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Section: Icp-aessupporting

confidence: 68%

Acidic/caustic alternating corrosion on carbon steel pipes in heat exchanger of ethylene plant

Gong

Yang

Cheng

et al. 2011

Materials & Corrosion

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“…[8], da dK I , by evaluating K I at different values of a, starting with the initial value of a, as determined using Eq. [2]. The value of a increased gradually until the value that gives K Ic is reached, because the effective crack length a cannot exceed that value where the specimen fails.…”

Section: A Determination Of K Iscc and Crack Growth Ratementioning

confidence: 98%

“…The magnitude of the problem in these industries accounts for the extensive SCC research over the past several decades. The SCC literature consists primarily of the following: (a) applied studies for developing mitigation measures (such as investigation of the influence of industrial process variables) [1,2] and (b) fundamental investigations of SCC mechanisms. [3] Selection of a mitigation measure for SCC is often based on the understanding of the SCC mechanism for a given alloy-environment system.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Manipulation of Crack-Tip Stress Field for Resistance to Stress Corrosion Crack Propagation

Raman

Ibrahim

et al. 2008

Metall Mater Trans A

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Corrosion-assisted propagation of an existing crack is profoundly influenced by the stress intensity at the crack tip. This article presents the first results of thermomechanical conditioning (TMC) for local manipulation of material at and ahead of the crack tip, in an attempt to retard/ stop crack propagation. Prenotched round tensile specimens of mild steel were subjected to rotating bending to generate a fatigue precrack, and then to apply localized thermomechanical conditioning. The threshold stress intensity factor (K ISCC ) for stress corrosion cracking (SCC) of precracked specimens with and without TMC was determined in a caustic environment. Results suggest that TMC can increase K ISCC . Finite element analysis of the specimens suggests development of compressive stresses at and around the crack tip, which is expected to improve the resistance to stress corrosion crack propagation (since stress corrosion cracks can propagate only under tensile loading).

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“…In fact, the SCC growth rate of mild steel in 12.5 M NaOH at 92°C to 110°C was determined to be in the range 10 -9 m/s by Singbeil and Tromans, [10] which is significantly greater than~10 -11 m/s at 150°C, as determined in the present study ( Figure 3). In this context, it may be important to note that the electrochemical and passivation behaviors of different grades of mild steels in caustic solutions are considerably different.…”

mentioning

confidence: 96%

“…Singbeil and Tromans [10] have determined the K ISCC of mild steel (AISI 1018) using double cantilever beam (DCB) specimens in 12.5 M NaOH at 92°C to bẽ 18 MPaAEm 1/2 . Unfortunately, to the best of the authors' knowledge, K ISCC data are not available for reasonably high temperatures such as 150°C.…”

mentioning

confidence: 99%

Circumferential Notched Tensile Testing for Correlation of the Stress Intensity Factor (K I ) and Stress Corrosion Crack Growth Rate

Rihan

Raman

Ibrahim

2008

Metall Mater Trans A

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A novel fracture mechanics technique has been employed for the determination of crack growth rate and threshold stress intensity factor (K ISCC ) for stress corrosion cracking (SCC) using small circumferential notch tensile (CNT) specimens. The technique was applied successfully for testing SCC susceptibility of AISI 1020 mild steel in 12.5 M NaOH at 150°C. The crack growth rate of mild steel in 12.5 M NaOH solution at 150°C has been determined at different stress intensity factors (K I ), and the K ISCC has been determined to be 29 MPaAEm 1/2 . The surfaces of fractured specimens have been examined by scanning electron microscopy (SEM) in order to establish intergranular propagation of stress corrosion cracks. The CNT testing is a simple, relatively fast, and cost-advantageous approach for generating crack growth rate and K ISCC data.

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Caustic Stress Corrosion Cracking of Mild Steel

Cited by 55 publications

References 18 publications

Acidic/caustic alternating corrosion on carbon steel pipes in heat exchanger of ethylene plant

Acidic/caustic alternating corrosion on carbon steel pipes in heat exchanger of ethylene plant

Thermomechanical Manipulation of Crack-Tip Stress Field for Resistance to Stress Corrosion Crack Propagation

Circumferential Notched Tensile Testing for Correlation of the Stress Intensity Factor (K I ) and Stress Corrosion Crack Growth Rate

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