Effect of sulphate anions on tunnel etching of aluminium

Flis, J.; Kowalczyk, Łukasz

doi:10.1007/bf00260695

Cited by 33 publications

(18 citation statements)

References 10 publications

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“…The presence of chloride ions has been associated with pit initiation. However, once a pit has been initiated, pit growth dominates due to the presence of sulfate ions 9, 10…”

Section: Discussionmentioning

confidence: 99%

Crevice corrosion of biomedical alloys: A novel method of assessing the effects of bone cement and its chemistry

Bryant

Farrar³

et al. 2013

J Biomed Mater Res

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In this study, five commercially available poly(methyl methacrylate) PMMA bone cements were tested to investigate the effects of antibiotics on the severity of crevice corrosion. Bone cements with varying chemistry were also tested. A test method was developed in part reference to ASTM F746-04. Cylindrical specimens were fitted with a bone cement tapered collar, creating consistent crevice conditions. Crevice corrosion was then studied using potentiodynamic polarization techniques in 0.9% NaCl solution (pH7.4) at 37°C. Surface analyses using a light microscope and scanning electron microscopy were also conducted to investigate the surface morphology after accelerated electrochemical testing. Initial testing of commercially available bone cements indicated that different PMMA bone cements can affect the initiation and propagation mechanism of crevice corrosion. Further studies, utilising electrochemical and mass spectroscopy techniques, have identified that the addition of radiopaque agent and antibiotics affect the initiation mechanisms of 316L stainless steel, whilst significantly increasing the extent of propagation in CoCrMo alloys.

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“…The presence of chloride ions has been associated with pit initiation. However, once a pit has been initiated, pit growth dominates due to the presence of sulfate ions 9, 10…”

Section: Discussionmentioning

confidence: 99%

Crevice corrosion of biomedical alloys: A novel method of assessing the effects of bone cement and its chemistry

Bryant

Farrar³

et al. 2013

J Biomed Mater Res

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“…It has long been established that the introduction of chloride and sulphate ions can increase a materials susceptibility to localised corrosion, with extensive research detailing the effects of these ions on the initiation and propagation mechanisms of localised corrosion. Chloride ions have been linked with the initiation stages of pitting corrosion, whilst sulphate ions have been shown to inhibit initiation, but promote propagation once the initiation has occurred on typically passive alloys [25,26]. Due to the restricted geometry of the interface and the temperature experienced in in-vivo, it is thought that this leaching out of antibiotics from the PMMA bone cement will result in high concentrations of sulphate ions within the interface, creating conditions favourable of accelerated fretting-corrosion.…”

Section: The Role Of Pmma Bone Cementmentioning

confidence: 99%

Fretting corrosion of fully cemented polished collarless tapered stems: The influence of PMMA bone cement

Bryant

Farrar²,

Brummitt³

et al. 2013

Wear

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a b s t r a c tIn order to investigate the effect PMMA bone cement chemistry has on the fretting corrosion of cemented femoral stems, a novel test setup with integrated electrochemistry was developed and conducted in part reference to ISO 7206-4:2010. Ultima TPS TM femoral stems were cemented into a specially prepared delrin moulds using a third generation cementing technique similar to the procedure used in-vivo. Three commercially available PMMA bone cements were tested in order to understand the role bone cement chemistry plays on the fretting-corrosion rates at the stem-cement interface. Each stem-cement component was then orientated and set in place using laboratory grade PMMA cement, immersed in 0.9% NaCl and subjected to 500,000 cycles of cyclic loading at 1 Hz. Intermittent Open Circuit Potential (OCP) and Linear Polarisation Resistance (LPR) measurements were conducted in order to assess the effect PMMA bone cement chemistry has on the localised dissolution of cemented femoral stems. Macroscopic observation and scanning electron microscopy with integrated energy dispersive X-ray analysis (SEM/EDX) was conducted in order to support the electrochemical findings.Crown

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“…Fig. 3 demonstrates applied potential dependence of the pit growth rate parameter b determined from the current transient in the logarithmic scale just after the interrupting the abrading action on pure AI in 0.01 M NaCI solutions with various SO42-ion concentrations of 0, 0.01 and 0.1 M. It is worthwhile to note that the b values in the presence of SO42-ions in chloride solutions were greater than those in the absence over the whole applied anodic potential range, implying that once the bare surface of pure A1 is newly exposed by the breakdown of the oxide film on it above Ep,,, i.e., pit initiation, ttmnels can be instantaneously formed at the bottom of the pre-existing pits in the presence of a SO42-ion [6].…”

Section: Resultsmentioning

confidence: 95%

“…Hampson et al [3] reported that in concentrated NaC1 solutions the pitting potential Ep, value can be shifted in the anodic direction by adding an SO, 2-ion only at concentrations above 0.3 M. In Flis and Kowalczyk's study [6], they deduced that SO42-ions retard pit initiation on the outer oxide-covered surface of pure A1 owing to their competitive adsorption with C1-ions. Moreover, our laboratory has conducted several studies with the aim of inhibiting the pitting corrosion of pure A1 in chloride solutions by the addition of SO42-ions [8][9][10].…”

Section: Introductionmentioning

confidence: 97%

Effects of applied potential and solution temperature on the pitting corrosion of pure aluminium in sulphate ion-containing chloride solution

Kim

Lee

Pyun

et al. 1999

Metals and Materials

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Effects of applied potential and solution temperature T. on the pitting corrosion of pure aluminium (AI) were investigated in 0.01 M NaCI solutions containing various sulphate (SO, 2-) ion concentrations using a potentiodynamic polarisation experiment, the potentiostatic current transient technique, ac impedance spectroscopy and atomic force microscopy (AFM). The potentiodynamic polarisation curves showed a rise in the pitting potential E,, values and a simultaneous increase in anodic current density at potentials much higher than the Ep,, value as the SO42-ion concentration increases. This implies that SO,"-ions impede pit initiation at potentials below Ep, but enhance pit growth above Ep,,. This was confirmed from the larger pit growth rate parameter b values of pure A1 exposed to SO4 ~ ion-containing chloride solutions during the abrading action than those exposed to SO42-ion-free chloride solution. Furthermore, at E=25~ the charge density Q values for the A1 metal dissolution in the presence of SO42-ions were smaller than the value in its absence. By contrast, as validated by the capacitance values and the AFM images of the re-anodized specimens, an enhanced metal dissolution was observed in SO42-ion-containing chloride solutions at T,=60 ~ and 80~ From the experimental findings, it is suggested that SO42-ions act as inhibitors of pitting corrosion on pure AI below E~,, and at T,=25~ whereas they act as promoters at T,=60 ~ and 80~ This originates from the accelerated dissolution of the bare metal extensively exposed to the temperature-sensitive C1-ion attack, which occurs at potentials above E,,,,.

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Effect of sulphate anions on tunnel etching of aluminium

Cited by 33 publications

References 10 publications

Crevice corrosion of biomedical alloys: A novel method of assessing the effects of bone cement and its chemistry

Crevice corrosion of biomedical alloys: A novel method of assessing the effects of bone cement and its chemistry

Fretting corrosion of fully cemented polished collarless tapered stems: The influence of PMMA bone cement

Effects of applied potential and solution temperature on the pitting corrosion of pure aluminium in sulphate ion-containing chloride solution

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