Localized Dissolution of Millscale-Covered Pipeline Steel Surfaces

Qin, Z.; Demko, Bryan A.; Noël, James J.; Shoesmith, David W.; King, Fraser; Worthingham, Robert; Keith, K.

doi:10.5006/1.3287824

Cited by 41 publications

(18 citation statements)

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“…Raman spectra in Fig. 11 shows bands at 245, 373, 522, 650, 719, and 1303 cm −1 using 532 nm-laser excitation, corresponding to the typical Raman frequency modes of γ-FeOOH [22][23]. Additionally, the shoulder peaks of α-Fe 2 O 3 and α-FeOOH can be observed.…”

Section: Characterization Of Corrosion Productsmentioning

confidence: 90%

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Guo

Liu

et al. 2015

Int J Miner Metall Mater

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The effect of microstructure variation on the corrosion behavior of high-strength low-alloy (HSLA) steel was investigated. The protective property of the corrosion product layer was also explored. Experimental results reveal that the type of microstructure has significant effect on the corrosion resistance of HSLA steel. The measurement results of weight loss, potentiodynamic polarization curves, and electrochemical impedance spectroscopy indicate that the steel with acicular ferrite microstructure exhibits the lowest corrosion rate. Martensite exhibits a reduced corrosion resistance compared with polygonal ferrite. It is found that the surface of the acicular ferrite specimen uniformly covered by corrosion products is seemingly denser and more compact than those of the other two microstructures, and can provide some amount of protection to the steel; thus, the charge transfer resistance and modulus values of the acicular ferrite specimen are the largest. However, corrosion products on martensite and polygonal ferrite are generally loose, porous, and defective, and can provide minor protectiveness; thus, the charge transfer resistance values for polygonal ferrite and martensite are lower.

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Section: Characterization Of Corrosion Productsmentioning

confidence: 90%

Effect of microstructure variation on the corrosion behavior of high-strength low-alloy steel in 3.5wt% NaCl solution

Guo

Liu

et al. 2015

Int J Miner Metall Mater

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“…This occurs, for example, through galvanic corrosion at phase boundaries [12,14] or at mill scale/steel interfaces. [22,23] Nevertheless, a pre-existing axial crack would come to a dormant state under a monotonic loading in nearneutral pH environments. In fact, mild mechanical cycling in near-neutral pH environments would also lead to crack dormancy, as is demonstrated in Figure 4(b).…”

Section: Existing Growth Modelsmentioning

confidence: 99%

Crack Growth Behavior of Pipeline Steel in Near-Neutral pH Soil Environments

Chen

Sutherby

2007

Metall Mater Trans A

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This article reports the crack growth behavior of X-65 pipeline steel in near-neutral pH environments. Although it is often referred to as stress corrosion cracking (SCC), the crack growth behavior of pipeline steels in near-neutral pH environments has been found to be consistent with that of true corrosion fatigue, and the crack growth rate da/dN can be correlated with DK 2 K max f 0:1 . This correlation enables the determination of threshold DK 2 K max f 0:1 values that demarcate the boundary between active growth and dormancy. Crack tip blunting was observed when a loading condition gave a DK 2 K max f 0:1 value below the threshold. The threshold is found to be environmentally sensitive, and possibly also material dependent, but the details are yet to be determined.

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“…However, a brief summary is made here for the purpose of better understanding the growth behavior of cracks beyond the dormant stage that is the focus of this paper. It is generally believed that crack initiation can be caused by many different mechanisms [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], including preferential dissolution at physical and metallurgical discontinuities such as scratches [12], inclusions [13], grain boundaries, pearlitic colonies and banded structures [14][15][16] in the steel; corrosion along persistent slip bands induced by cyclic loading prior to corrosion exposure [14,17]; crack initiation at stress raisers such as corrosion pits [18,19]; and localized corrosion through millscale-steel galvanic effects [20]. The initiation of microstructurally short cracks, usually less than 100 lm, can occur under a constant stress loading.…”

Section: Basic Considerationsmentioning

confidence: 99%