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Showing 1 to 11 of 11 for “"Passive films"”.
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Semiconducting properties of the passive films on copper
The semiconducting properties of the passive films on copper have been investigated through capacitance, photoresponse and kinetic measurements. Mott-Schottky plots show that the passive films on copper are p-type semiconductors. The metal deficits form the electron acceptors, which give rise to …
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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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In situ and ex situ surface investigations of thiosulfate, sulfate and chloride accumulation on stainless steel and aluminum
… to the fact that anion interaction with passive films may promote either film degradation or corrosion inhibition.
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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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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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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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Corrosion studies of stainless steel blades
… and the surface finish. The evolution of the passive films on Martensitic 440 stainless steel in seawater and in pure 3.5 % NaCl and 3.5% acetic acid is studied using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). This thesis describes and evaluates the comparison …
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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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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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Abrasion-corrosion of downhole drill tool components
… was proposed that the presence of Co(OH)2 based passive films, also detected by XPS analysis, appears to influence the rate of binder-phase removal by altering the stiffness of the abrasive-surface contact and lowering the friction between abrasives and the surface and in turn lowers the overall …
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Mechanisms governing the growth, reactivity and stability of iron sulfides
… system comprising an iron sulfide film (passive layer) formed on iron or steel in contact with an hydrogen sulfide (H₂S)- rich fluid can thus, in principle, be modeled by a series of unit reaction steps that control the rate of degradation under given thermodynamic conditions. This …