Concept
Passivation
Concepts associés (25)
Spall
Spall are fragments of a material that are broken off a larger solid body. It can be produced by a variety of mechanisms, including as a result of projectile impact, corrosion, weathering, cavitation, or excessive rolling pressure (as in a ball bearing). Spalling and spallation both describe the process of surface failure in which spall is shed. The terms spall, spalling, and spallation have been adopted by particle physicists; in neutron scattering instruments, neutrons are generated by bombarding a uranium (or other) target with a stream of atoms.
Ion ferrique
vignette|Diagramme de Pourbaix d'une solution aqueuse de fer. En chimie, l'ion ferrique (Fe3+) est l'ion trivalent du fer (état d'oxydation +III), par opposition à l'ion ferreux, ce qui indique un composé de fer divalent (état d'). Cet usage est assez obsolète, la nomenclature UICPA ayant des noms contenant l'état d'oxydation noté avec des chiffres romains entre parenthèses à la place, tels l'oxyde de fer(II) pour l'oxyde de fer FeO et l'oxyde de fer(III) pour l'oxyde de fer Fe2O3. Ferromagnétisme Fabricati
Procédé planar
droite|vignette| Photo de puce annotée d'une puce Fairchild Le procédé planar est un procédé de fabrication utilisé dans l'industrie des semi-conducteurs pour fabriquer les parties élémentaires d'un transistor et connecter ensemble les transistors ainsi obtenus. C'est le processus principal de fabrication des puces de circuits intégrés en silicium. Il utilise les méthodes de passivation de surface et d'oxydation thermique.
Chromate and dichromate
Chromate salts contain the chromate anion, CrO42−. Dichromate salts contain the dichromate anion, Cr2O72−. They are oxyanions of chromium in the +6 oxidation state and are moderately strong oxidizing agents. In an aqueous solution, chromate and dichromate ions can be interconvertible. Potassium-chromate-sample.jpg|[[potassium chromate]] Potassium-dichromate-sample.jpg|[[potassium dichromate]] Chromates react with hydrogen peroxide, giving products in which peroxide, O22−, replaces one or more oxygen atoms.
Corrosion engineering
Corrosion engineering is an engineering specialty that applies scientific, technical, engineering skills, and knowledge of natural laws and physical resources to design and implement materials, structures, devices, systems, and procedures to manage corrosion. From a holistic perspective, corrosion is the phenomenon of metals returning to the state they are found in nature. The driving force that causes metals to corrode is a consequence of their temporary existence in metallic form.