Global ETD Search
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Showing 1 to 15 of 15 for “"repassivation"”.
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Flow Effects Upon the Repassivation of Iron and Cobalt in Neutral and Acidic Solutions
… amperometric reduction of the oxide layer. Repassivation of iron, cold rolled steel, and cobalt in neutral and acidic aqueous sulfate solutions was investigated by observing electrochemical current and potential transients under controlled variation of parameters.
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Local Environment in Pitting Corrosion of Aluminum
… microsensors were used to study propagation and repassivation of pits on pure aluminum in pH 11 NaCl solution. It was concluded that the pH inside a growing pit was around 2.7, and the chloride concentration was higher than the saturation concentration. After current to the pit was turned off, pH …
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Experimental and Theoretical Investigation of Localized Ultrasonically-Induced Cavitation Effects on Electrochemical Passivity (Corrosion, Mass Transfer, Depassivation)
… the processes controlling the depassivation and repassivation phenomena were quantitatively analyzed. Experimental investigations were coupled with theoretical models to enable the prediction and evaluation of mass transfer rates and fluid pressures near the metal surface.
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Effectiveness of Thermal Oxidation in Relation to Anterior Cervical Plates
… were subjected to potential-step tests to assess repassivation ability after abrasion. All samples displayed repassivation ability, except for the sample treated at 600˚C for 4 hours. Surface roughness was measured with atomic force microscopy before and after thermal oxidation treatments. Lower …
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Effect of aqueous environments on the fatigue behavior of 90-10 copper nickel
… due to the retardation of film formation and repassivation. These studies showed that three different mechanisms of corrosion fatigue were likely: localized anodic dissolution, surface film rupture and hydrogen embrittlement. The dominance of one mechanism over the other two depends on the …
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Corrosion and Tribocorrosion Kinetics of Al-based Concentrated Alloys in Aqueous Sodium Chloride Solution
… effects of wear condition on the depassivation-repassivation kinetics during tribocorrosion, in the first study, the tribocorrosion behaviors of Al-20 at.%Mn alloys were investigated in simulated seawater by changing the sliding frequency from 0.05 to 1 Hz in reciprocal motion. The results show …
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Stress corrosion cracking of austenitic stainless steels
… was thought to be related to its extremely rapid repassivation rate and high SFE.
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Pulsatile Electropolishing of Nitinol Stents
… potential >1V vs SCE, and a similarly high repassivation potential. Balancing the charge in the anodic and cathodic pulses was the key to minimizing the resulting surface roughness, and eliminating micropits. Nitinol is a nearly binary alloy of NiTi and a charge transfer ratio of 1 yielded …
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Effects of Chemical and Structural Heterogeneity on the Tribocorrosion Resistance of Metals in Aqueous Solutions
… kinetics but simultaneously improved the self-repassivation in the blood bank buffered saline solution at body temperature.
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Design, Material and Surgical Assembly Effects on Fretting Corrosion Behavior of Modular Tapers in Orthopedic Implants
… The basic processes of oxide film abrasion and repassivation, and the associated effects (chemical, transport, mechanical and electrical) of these processes have been well described and studied over time. </p> <p>Despite these advancements, there is much that is still not well understood about …
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Erosion - corrosion mechanisms of stainless steel UNS S31603
… surface. The amount of charge consumed and the repassivation kinetics were derived from the single particle impact experiments. Lips also appear to crack on the surface believed to be caused by corrosive action accelerating material removal. The results were analysed statistically and for the …
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Abrasion-corrosion of cast CoCrMo in simulated hip joint environments
… wear-corrosion mechanisms, and the depassivation/repassivation kinetics of the CoCrMo have been explored. A variety of surface and sub-surface characterization techniques have been employed to identify the microstructual wear mechanism interactions. Results show that the change of protein …
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Understanding the Structure-property Relationships of Solid-state Additively Manufactured Stainless-steel Coatings
… surface. In tribo-corrosion conditions, the repassivation kinetics of the passive film between sliding cycles became increasingly active, which prevented accelerated corrosion from taking place. In fretting corrosion conditions, the surface response transitioned from the reciprocating sliding …
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Understanding the electrification-driven lubrication mechanism of phosphonium ionic liquids to enhance the degradation resistance of electric vehicle components
… PRTILs or lubricants due to their better surface repassivation ability. The wear-corrosion synergistic assessment revealed that the total material loss under the combined effect of wear and corrosion, increased significantly for each PRTIL, due to the corrosion accelerated wear mechanism. The …
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Mechanisms of Liquid-Metal-Activated Aluminum-Water Reactions and Their Application
… and also serves as a physical barrier preventing repassivation by ambient oxygen. It was discovered that by increasing the pH of the reaction environment, a two-fold increase in hydrogen production under near-stoichiometric conditions can be achieved. To account for the reduced reactivity in …