Effect of Salinity on Corrosion Behavior of DH36 Steel in Seawater Immersion Zone

Cheng, Peng; Huang, Xiaohua

doi:10.12783/dtetr/apetc2017/11221

Cited by 4 publications

(8 citation statements)

References 3 publications

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“…In more brine-like (10 wt% NaCl) saline solutions, however, further increases in corrosion rate were not observed. This finding is in line with a number of other investigations [6,7] on carbon steel and low-alloy steel in air-saturated saline solutions which have reported that the corrosion rate attains a maximum value at about 1-4 wt% NaCl.…”

Section: The Influence Of Salinity On Corrosion Rates Of Low Alloy St...supporting

confidence: 93%

“…In terms of corrosion behaviour, a number of studies on carbon steel and low-alloy steel in air-saturated saline solutions have been carried out over the years. Thus, Revie and Uhlig [6] and Cheng and Huang [7] report that the corrosion rate of iron and low-alloy steel, in aerated water at ambient temperature, reaches a maximum at about 3 wt% NaCl. Zeng et al Further, [8] state (but without displaying the results) that the maximum corrosion rate of carbon steel lies at 1 wt% NaCl.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Evaluation of the Effect of Different NaCl Concentrations on Low Alloy- and Stainless Steels under Corrosion and Erosion-Corrosion Conditions

Brownlie

Hodgkiess

Pearson³

et al. 2022

CMD

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The main objective of this study was to assess the influence of salt concentration on the corrosion behaviour, including the role of hydrodynamic conditions, of two broad classes of ferrous engineering materials. These are comprised of alloys, typified by a low-alloy steel (UNS G43400) that corrodes actively in aqueous conditions and a range of passive-film-forming stainless steels (UNS S31600, UNS S15500 and UNS S32760). Corrosion monitoring employed electrochemical (potentiodynamic polarisation) techniques. Three concentrations of aerated sodium chloride were utilised: 0.05 wt% NaCl, 3.5 wt% NaCl and 10 wt% NaCl. In quiescent, liquid impingement and solid/liquid impingement conditions, the corrosion rate of the low-alloy steel was observed to peak at 3.5 wt% NaCl, followed by a reduction in 10 wt% NaCl solution. These findings expand the range of previously reported trends, focused on static conditions. Such corrosion rate/salinity trends were observed to be dictated by the progress of the anodic reaction rather than influence on the cathodic reaction. Detailed studies were undertaken using segmented specimens to facilitate comparisons of the influence of hydrodynamic variations on corrosion behavior; these revealed that such variations influence the corrosion rates of low-alloy steel to a much lesser extent than the effect of changes in salinity. For the stainless steels, in quiescent and flowing conditions, when surface passive films are stable, there was a constant increase in corrosion rate with salinity. In solid-liquid conditions, however, the periodic film-destruction/repassivation events resulted in a similar corrosion rate/salinity trend to that displayed by the low-alloy steel, but with a much larger effect of hydrodynamic conditions. Additonally, the study revealed an underlying influence of stainless steel composition that mirrored, to an extent, the corrosion behaviour in pitting/re-passivation situations

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Section: The Influence Of Salinity On Corrosion Rates Of Low Alloy St...supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Electrochemical Evaluation of the Effect of Different NaCl Concentrations on Low Alloy- and Stainless Steels under Corrosion and Erosion-Corrosion Conditions

Brownlie

Hodgkiess

Pearson³

et al. 2022

CMD

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“…The low-alloy steel exhibited significant corrosion-enhanced abrasion damage in the OA at all salinities (17-21% of overall damage) but this proportion did not increase with salinity. This is likely to be associated with the observed corrosion rates remaining the same between 3.5%NaCl to 10%NaCl and this feature represents a similarity between the corrosion rate/ salinity trends between low-turbulence conditions [12][13][14][15] and impingement situations which have been discussed in detail elsewhere [16].…”

Section: Corrosion-enhanced Abrasion ∆M Cmentioning

confidence: 86%

“…With regard to the effect of salt concentration on the pure corrosion behaviour of iron, carbon-and low-alloy steels, there is a general consensus that, in low-turbulent, solids-free, neutral and low pH conditions [11][12][13][14][15], there is an increase in corrosion rate with increased NaCl content, before the corrosion rates decrease above a certain salt concentration. The reported value of the salt concentration associated with this maximum corrosion rate varies between the different studies.…”

Section: Introductionmentioning

confidence: 99%

“…The reported value of the salt concentration associated with this maximum corrosion rate varies between the different studies. In low pH conditions, the maximum rate is reported to occur at 1%NaCl or less [14,15]; however, in neutral conditions, the peak is reported to occur between 1% and 3%NaCl [11][12][13]. Although some of these differences can be attributed to factors such as variations in the cathodic reactions over a range of pH, some debate remains on the correlations between salt concentration and consequent corrosion rate [14,16].…”

Section: Introductionmentioning

confidence: 99%

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Erosion-Corrosion Mechanisms of Engineering Steels in Different NaCl Concentrations

Brownlie

Hodgkiess

Pearson³

et al. 2021

J Bio Tribo Corros

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This study utilises a recently developed, enhanced approach to assess detailed aspects of the corrosive wear behaviour of different steel grades in aqueous slurries containing three NaCl concentrations (0.05%NaCl, 3.5%NaCl and 10%NaCl). Erosion-corrosion testing was conducted using a slurry impingement test rig and damage was quantified using volume loss, potentiodynamic polarisation scans and surface topography. Single- and segmented specimens were adopted to yield the contribution of the degradation mechanisms in the two hydrodynamic zones (directly impinged and surrounding area). The overall material losses from the two zones of the stainless steels were observed to increase with increasing salinity. However, the overall material loss for the low-alloy steel was found to increase from 0.05%NaCl to 3.5%NaCl, before reducing when the salinity was further increased to 10%NaCl. Changes in salinity were observed to have the most effect on the corrosion-enhanced mechanical damage mechanism. The in-house developed technique demonstrated good linkage between single samples and the outer area damage region. However, it also showed that the use of single samples can be less successful when assessing highly turbulent (directly impinged) damage regions.

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Evaluation of Corrosion Resistance of as-Sprayed WC–Co–Cr on DH-36 Steel with Addition of 3% GNPs

Shrivastava

Verma

Kumar

et al. 2023

Trans Indian Inst Met

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Effect of Salinity on Corrosion Behavior of DH36 Steel in Seawater Immersion Zone

Cited by 4 publications

References 3 publications

Electrochemical Evaluation of the Effect of Different NaCl Concentrations on Low Alloy- and Stainless Steels under Corrosion and Erosion-Corrosion Conditions

Electrochemical Evaluation of the Effect of Different NaCl Concentrations on Low Alloy- and Stainless Steels under Corrosion and Erosion-Corrosion Conditions

Erosion-Corrosion Mechanisms of Engineering Steels in Different NaCl Concentrations

Evaluation of Corrosion Resistance of as-Sprayed WC–Co–Cr on DH-36 Steel with Addition of 3% GNPs

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