Carbon Steel—Corrosion in Freshwaters

Matsushima, Iwao

doi:10.1002/9780470872864.ch44

Cited by 9 publications

(8 citation statements)

References 26 publications

(40 reference statements)

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“…Moreover, the corrosion current density cannot be determined from the anodic branches, as there is no clear linear region. Finally, under the aforementioned experimental conditions, steel is also corroded via localized corrosion with the formation of pits [81,82]. Therefore, the Tafel method is not appropriate to be used for localized corrosion, such as pitting corrosion, as it only yields an average uniform corrosion rate [83].…”

Section: Appl Sci 2019 9 X For Peer Review 18 Of 38mentioning

confidence: 99%

Comparative Study on the Corrosion Inhibitive Effect of 2-Mecraptobenzothiazole and Na2HPO4 on Industrial Conveying API 5L X42 Pipeline Steel

et al. 2019

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Mild or low-carbon steel has an increasing utilization and is widely used for building construction, machinery parts, and pipelines, because it can be machined easily and has enhanced weldability as well as a low price. In any case, the corrosion resistance of mild steel under the conditions in industrial applications or in atmosphere is a thoughtful concern. This study inquires into the application of 2-mecraptobenzothiazole (MBT) and Na2HPO4 as corrosion inhibitors for the protection of API 5L X42 pipeline steel in 3.5 wt % NaCl as well as in water from the Athens city supply system. The electrochemical/morphological characterizations of the aforementioned mild steel proved that the corrosion protection mechanisms can be assigned to the protective layers created onto the metal surface because of the presence of the inhibitors, which prevent chloride’s penetration. The synergistic effect of the MBT and Na2HPO4 corrosion inhibition behavior, in a molar ratio of 1:1, revealed that the additives performed effectively with corrosion inhibition efficiency above 90%.

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Section: Appl Sci 2019 9 X For Peer Review 18 Of 38mentioning

confidence: 99%

Comparative Study on the Corrosion Inhibitive Effect of 2-Mecraptobenzothiazole and Na2HPO4 on Industrial Conveying API 5L X42 Pipeline Steel

et al. 2019

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“…A somewhat different view is given by Matsushima who reports that, unlike pitting of passive metals where formation of passive-active cells of large potential difference coupled with local breakdown of passivity leads to deeper pits, localized corrosion of iron and steel tends to be shallow in most cases, and this is claimed to be the result of the potential difference of various macro-galvanic cells being not as large [22,23]. A study where welded mild steel sheet piling heat affected area coupons were subjected to open circuit potential tests [9] showed that the parent metal is slightly more noble compared to the heat affected or weld areas.…”

Section: Effect Of Microstructurementioning

confidence: 96%

“…Because weldments exhibit special microstructural features they must be given careful attention in order to predict acceptable corrosion service life of welded structures [19]. The role of macro-compositional and micro-compositional variations common to weldments is emphasized in the literature, with empirical studies showing these to be the main culprits of highly localised corrosion and pitting [9,15,16,20,21,22,23,24]. Despite many reports considering these matters for passively protected corrosion resistant alloys (i.e.…”

Section: Effect Of Microstructurementioning

confidence: 99%

“…The HAZ transformation to austenite on heating will be followed on cooling by transformation to give either a ferrite-carbide microstructure or martensite, depending on the material composition, peak temperature and cooling rate. Preferential HAZ corrosion cases in a range of aqueous environments has been reported [5,15,16,20,21,22,23,24] however there is still some controversy regarding the specific mechanism involved. It has been suggested, based on theoretical considerations, that the presence of low-temperature transformation products such as martensite, lower bainite or retained austenite result in preferential corrosion sites [19].…”

Section: Effect Of Microstructurementioning

confidence: 99%

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Long-Term Quantification of Structural Weld Capacity Loss Due to Localised Corrosion

Chaves

2016

ICMS

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Severe localised corrosion has long been considered the main cause for structural integrity loss of steel assets exposed to aggressive marine environments, particularly as caused by pitting corrosion on or around weld zones. The weld heat affected zones for welds in steel structures are known for their higher rate of localized corrosion. The effects on corrosion losses on the structural reliability of welded mild steel, as commonly used within the offshore industry worldwide , are considered for quantifying the long-term loss of structural capacity. Apart from the expected reduction of capacity due to cross-section loss the results show that structural reliability is sensitive to likely nutrient pollution and macro-galvanic effects within the steel matrix. The possibility of localized corrosion being the result of thermal microstructural gradients produced during the welding process is discussed.

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“…Freshwaters that are hard have high levels of calcium (Ca 2 + ) and bicarbonate (HCO 3 − ) ions. In hard water environments under the right conditions, calcium carbonate (CaCO 3 ) fi lms may deposit, providing an effective diffusion barrier coating for decreasing corrosion rates of the underlying metal substrate [38] . However in soft waters the corrosion rate is greatly increased due to the lack of an effective diffusion barrier coating.…”

Section: Chemical Composition In Wet Corrosive Environmentsmentioning

confidence: 99%