Cavitation Corrosion of Duplex Stainless Steel in Seawater

Al-Hashem, Abdulhameed; Caceres, P. G.; Abdullah, Abdulmajeed; Shalaby, H. M.

doi:10.5006/1.3280438

Cited by 34 publications

(13 citation statements)

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“…On comparing the OCP trend of the two materials when undergoing cavitation, it can be seen that while NAB reaches stability at -210 mV at a lower voltage as compared to DSS, the stability of DSS attained after the rig is switched on is much lower than that of NAB showing that NAB has higher corrosion resistance than DSS. Similar to the results observed by Al-Hashem et al [24], there was a shift in corrosion potential for DSS under cavitation in the active direction by 75 mV; however, there was not a very substantial shift in case of NAB. This may be due to the experimental reproducibility since several tests were conducted giving similar results.…”

Section: Surface Profilometry and Morphologysupporting

confidence: 89%

“…Specimen cross-sections revealed microcracks at the bottom of the cavities initiating from the ferrite matrix with crack propagation impeded by the austenite islands, branching along the parallel slip systems. They also observed an active shift in the free corrosion potential by about 140 mV when cavitation was applied, with a slight increase in the cathodic and anodic currents, shifting the corrosion potential in the noble direction by 75 mV [24].…”

Section: Introductionmentioning

confidence: 92%

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The Synergistic Effects of Cavitation Erosion–Corrosion in Ship Propeller Materials

2015

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Synergy tests were performed for two most common propeller materials, duplex stainless steel (DSS) and nickel aluminium bronze (NAB), by means of an indirect ultrasonic vibratory system. Tests were conducted for pure cavitation erosion in distilled water, pure corrosion using in situ electrochemistry under 3.5 % NaCl solution and a combination of cavitation erosion-corrosion to understand the overall synergism existing between the two. The results were analysed using gravimetric as well as volumetric analysis. Alicona and Talysurf were employed for the surface topography, and scanning electron microscope was used to see the microstructural morphologies of the samples under different conditions. As a result, the electrochemical tests held at open circuit potential showed that, although DSS exhibited higher resistance to corrosion under seawater alone, NAB exhibited much higher resistance to corrosion when subjected to cavitation. From the experiments conducted, it was concluded that synergy had measurable impact on the cavitation erosion-corrosion of both NAB and DSS. NAB was found to be more susceptible to erosion under both the conditions as compared to DSS with prominent selective cavitation erosion of alpha phase in the microstructure. The overall synergism of NAB was found to be higher than that of DSS.

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Section: Surface Profilometry and Morphologysupporting

confidence: 89%

Section: Introductionmentioning

confidence: 92%

The Synergistic Effects of Cavitation Erosion–Corrosion in Ship Propeller Materials

2015

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“…When the surface is impacted by high speed microjet formed in the cavitating liquid, the material deforms at high strain rate [8]. Such deformation causes easier ferrite fracture and removal from the surface than that of austenite because the face-centered cubic (fcc) structure has low sensitivity to the strain rate [9]. So it can be found that ferrite is more prone to removal from the eroded surface than austenite.…”

Section: Resultsmentioning

confidence: 89%

Cavitation Erosion of X5CrNi18-10 Austenitic Stainless Steel Alloyed with TiC

Szkodo¹

2008

Advances in Materials Sciences

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This work presents investigations of cavitation resistance of X5CrNi18-10 austenitic stainless steel after alloying its surface by CO 2 laser beam. Laser beam machining was performed in two variants. In the first case, surface layer was enriched with TiC in amount of 1.55 % wt. and in the second one in amount of 3.97 % wt. The obtained results revealed that content of 3.97 % wt. TiC caused an increase of plastic deformations resistance of surface under the cavitation loading and simultaneous increase in embrittlement of alloyed layer.

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“…The phenomenon consists of the continuous collapse of numerous bubbles due to localized pressure changes at high-velocity fl ow. [1][2] This collapse is accompanied by the sudden fl ow of liquid, which originates stress pulses that can cause plastic deformation on solid surfaces. The magnitude of the impact stress may be as high as 1,000 MPa.…”

Section: Introductionmentioning

confidence: 99%

Cavitation—Corrosion Studies on Welded and Nonwelded Duplex Stainless Steel in Aqueous Lithium Bromide Solutions

García-García¹,

Garcı́a-Antón²,

Muñoz³

et al. 2007

CORROSION

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The objective of this work was to study the effect of dynamic fl ow conditions (mechanical effect) on the cyclic potentiodynamic and potentiodynamic curves of EN 1.4462, its fi ller metal (EN 1.4462F), and the welded metal (EN 1.4462W) obtained by gas tungsten arc welding (GTAW). The implosion of bubbles on the surface modifi es the electrochemical behavior of these different alloys. Values of open-circuit potentials (OCP), corrosion potentials, corrosion current densities, passivation current densities, pitting potentials, repassivation current densities, repassivation potentials, and anodic hysteresis loops were obtained from potentiodynamic curves at 25°C in 400, 700, and 850 g/L lithium bromide (LiBr) solutions under static and dynamic conditions. It has been determined that the welding causes a deterioration of the corrosion resistance of the duplex stainless steel, and the EN 1.4462W is always the anodic element of the pair comprising welded and nonwelded stainless steel. The corrosion behavior and the repassivation behavior of the alloys are modifi ed by cavitation. The surface of the materials was examined to evaluate the corrosion damage to the samples. The electrode surfaces of the alloys show differences when the attack takes place under static or under dynamic conditions.

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Cavitation Corrosion of Duplex Stainless Steel in Seawater

Cited by 34 publications

References 1 publication

The Synergistic Effects of Cavitation Erosion–Corrosion in Ship Propeller Materials

The Synergistic Effects of Cavitation Erosion–Corrosion in Ship Propeller Materials

Cavitation Erosion of X5CrNi18-10 Austenitic Stainless Steel Alloyed with TiC

Cavitation—Corrosion Studies on Welded and Nonwelded Duplex Stainless Steel in Aqueous Lithium Bromide Solutions

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