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Showing 1 to 17 of 17 for “"passive film"”.
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Effect of Turbulence on the Passive Film Growth and Associated Durability of Aluminum Alloys in Simulated Seawater
… presents significant degradation risks to active-passive metals due to enhanced localized degradation phenomena. A multidisciplinary experiment was proposed to study the relationship between hydrodynamics in fully-developed pipe flow and both the growth and performance characteristics of passive …
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Modeling of mechanisms affecting the growth and breakdown of iron sulfide films
… cells, batteries, and catalysts and corrosion passive films. However, existing analytical and numerical models of such electrochemical systems like passive films are derived from mathematical expressions for the growth and degradation of the ionic material that are not derived from the rates of …
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Initiation and growth of corrosion fatigue crack for AVPP treated stainless steel.
… influence of material surface condition, notably passive film condition and surface residual stress and the effect of applied surface stress on the development of corrosion pits has been assessed in relation to their role on the fatigue behaviour of stainless steel materials, in particular the …
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Corrosion and Tribocorrosion Kinetics of Al-based Concentrated Alloys in Aqueous Sodium Chloride Solution
… The results show that the depassivation rate of passive film increased with increasing sliding frequency. Mechanical wear also increased with increasing sliding frequency, which was mainly related to the increase of coefficient of friction and real contact area. Chemical wear tended to increase …
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An electrochemical and surface analytical investigation of iron oxidation, passivation and corrosion inhibition
… and surface analytical study of iron oxidation, passive film formation and corrosion inhibitor interaction is presented. Ultrahigh vacuum surface analysis by Auger electron spectroscopy (AES), low energy electron diffraction (LEED), thermal desorption mass spectrometry (TDMS) and ion bombardment …
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Stability of dental alloys in artificial saliva: an electrochemical and XPS investigation
… alloy in artificial saliva forms a protective passive film at both temperatures. At 25°C the oxy-hydroxide film formed is enriched in oxidized chromium, after long immersion times (7 days) the nominal composition of oxidized manganese (18%) is found. Molybdenum in the film is slightly enriched. …
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Investigating the nature of passive films on austenitic stainless steels
AbstractThe formation and breakdown of the passive film on stainless steels are mainly controlled by ionic and electronic transport processes. Both these processes are in part controlled by the electronic properties of the oxide film. Consequently it is vital to gain a detailed perception of the …
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Mechanisms of fixed contamination of commonly engineered surfaces
… However, these result in dissolution of the passive oxide layer formed at the metal surface. This increases the level of secondary waste which, in turn, increases the burden of effluent treatment plants. The passivation of steels in HNO3 is complicated by the autocatalytic reduction of HNO3 …
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Pitting corrosion of aluminum-alloys at aluminum(3) iron inclusions: The effect of local chemical environment and transport phenomena
… type intermetallic particles depassivate the passive film of many commercial aluminum alloys through a local alkalization mechanism in an aerated NaCl solution. This mechanism was verified on the basis of polarization data, theoretical modeling, and in-situ optical observations for commercial …
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Integrated environmental degradation model for Fe-Ni-Cr alloys in irradiated aqueous solutions
… *dissolution rate at the crack tip following passive film rupture. The results of each of these models are combined to determine the crack advance rate for the given conditions. Environmentally assisted cracking (EAC) is a phenomenon where a combination of aggressive environment, susceptible …
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An Exploration of the Effect of Temperature on Different Alloys in a Supercritical Carbon Dioxide Environment
… forms a higher integrity and more stable passive film than iron and chromium. Additionally, nickel has a lower oxygen affinity than iron and therefore the migration of cations into the scale is lower.
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Formation and Quantification of Corrosion Deposits in the Power Industry
… DMA was more effective at keeping the passive film formed on the alloy 600 surface from failing at both ambient and high temperatures. Morpholine was found result in higher corrosion resistance compared to the other amines in case of alloy 690.
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Enriched Story Experiences with a New Video Interaction Model
Interactive film is a video storytelling medium lying between films and video games. It traditionally gives users choices at fixed points. This supports non-linear storylines, as the user can influence what happens in the plot by making decisions. However, such films are tightly scripted, and …
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EFFECTS OF SIZE AND COMPOSITION ON THE PERFORMANCE OF DEALLOYED NANOPOROUS METAL CATALYSTS FOR CO2 REDUCTION, O2 EVOLUTION, AND H2 GENERATION
… is diminished by the self-blocking surface passive film. In terms of composition effect, my studies using nanoporous Ni-Fe-Mn ternary alloys with varying compositions show that there exist an optimal Ni/Fe ratio (Ni/Fe = 2) which exhibits optimal activity towards O2 evolution. Next, based on …
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Understanding Liquid-Air Interface Corrosion of Steel in Simplified Liquid Nuclear Waste Solutions
… immediately above the meniscus. A pre-existing passive film boundary in the bulk solution could not eliminate LAI corrosion.Cyclic potentiodynamic polarization measurements were conducted, but could not distinguish the solution aggressiveness in terms of passive current density and pitting …
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Abrasion-corrosion of cast CoCrMo in simulated hip joint environments
… the surfaces, impose less damage to the surface passive film and polish the wear scars through a chemical mechanical polishing mechanism. In addition, tribo-corrosion tests at micro-/nano- scales reveal the effects of single abrasive particle on the surface/sub-surface microstructual change. This …
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Understanding the Structure-property Relationships of Solid-state Additively Manufactured Stainless-steel Coatings
… 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 regime (RSR) to the partial …