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FREE CORROSION [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 - external organization data 2011-06-21

English

Subject field(s)
  • Chemistry
  • Geochemistry
  • Surface Coating (Metals)
  • Compartment - Canadian Nuclear Safety Commission
Universal entry(ies)
Cr
symbol
7440-47-3
CAS number
DEF

A metallic element, symbol Cr, which does not occur in the free state, is remarkable for the brilliant colours of its compounds, has the atomic number 24, the atomic weight 51. 996, is part of the group VIB of the Periodic Table, and is used as an alloying and plating element on metal and plastic substrates for corrosion resistance, in chromium-containing and stainless steels, as a protective coating for automotive and equipment accessories, in nuclear and high-temperature research and as a constituent of inorganic pigments.

OBS

chromium metal: expression used by the US Occupational Safety and Health Administration (OSHA).

OBS

chromium: term adopted by Environment Canada; used in the list of pollutants measured in the National Air Pollution Surveillance Network (NAPS).

French

Domaine(s)
  • Chimie
  • Géochimie
  • Recouvrement des métaux
  • Tiroir - Commission canadienne de sûreté nucléaire
Entrée(s) universelle(s)
Cr
symbol
7440-47-3
CAS number
DEF

Corps simple de symbole Cr, de numéro atomique 24 et de poids atomique 51,9961, habituellement bi, tri ou hexavalent, qui, en raison de sa résistance à la corrosion de l'atmosphère et de certains agents chimiques, de sa haute dureté et de sa résistance à l'usure, est employé couramment en revêtement pour la protection des aciers et d'autres métaux.

OBS

chrome : terme retenu par Environnement Canada; utilisé dans la liste des polluants mesurés par le Réseau national de surveillance de la pollution atmosphérique (RNSPA).

Spanish

Campo(s) temático(s)
  • Química
  • Geoquímica
  • Revestimiento de metales
  • Compartimiento - Comisión Canadiense de Seguridad Nuclear
Entrada(s) universal(es)
Cr
symbol
7440-47-3
CAS number
OBS

Elemento químico de símbolo Cr, número atómico 24, masa atómica 51.996, y configuración electrónica (Ar)3d54s1, con 9 nucleídos, 4 de los cuales son estables. Forma cristales metálicos con estructura cúbica centrada en el espacio.

Save record 1

Record 2 2007-02-22

English

Subject field(s)
  • Small Arms
  • Armour
CONT

The M240B machine gun is loaded from the closed bolt position. The M240B is fired, unloaded, and cleared from the open bolt position. The safety must be placed on "F" before the bolt can be pulled to the rear. Before belted ammunition can be used, it must be linked with the double link at the open end of the bandoleer. It must be free of dirt and corrosion.

French

Domaine(s)
  • Armes légères
  • Arme blindée

Spanish

Save record 2

Record 3 1999-02-12

English

Subject field(s)
  • Masonry Practice
  • Geochemistry
CONT

Historic Structures : Cleaning Historic Masonry... Use clean potable water free from contaminants. Appearance of iron and copper stains, possibly in regions in which local water supply has relatively high metal content, is more easily avoided with introduction of complexing agents into water. Stones with high metal content are susceptile to development of Liesegang rings which can accelerate decay of corners and edges. Some municipal water is highly chlorinated; if used on limestone, it can make it more soluble or cause corrosion of metal ties.

CONT

Technology of Humid Walls Drying with Crystalline Injection Technology. The Palace complex in Lowicz near Warsaw is on top of a long list of over 2550 buildings structures in that number over 100 in Cracow thus far treated in Poland by the crystalline injection technique. The work of dampness removal in these 18th century historical buildings was carried out in july 1987 ... The crystalline injection technique developed by Wojciech Nawrot is covered by patent ... Crystallisation of the substance injected occurs by the effect referred to in the specialist literature as the periodic precipitation process or ageing sol. During this specific crystallisation self-organisation of crystals takes place. The effect is also thermodynamically explained. The structure thus formed resembles some narrow rings which may be encountered in nature in geological systems (known as the Liesegang rings).

Key term(s)
  • Liesegang rings

French

Domaine(s)
  • Maçonnerie
  • Géochimie
CONT

[...] la distance entre molécules de sucre hydratées étant très faible et leur hydratation de nature électrostrictive assez forte, on voit mal comment les molécules d'eau peuvent diffuser dans ce milieu. Le mode de migration pourrait alors être dû à la rotation des molécules de sucre et un transfert molécule à molécule du type de celui qui est proposé dans la publication d'English et Dole [...] le développement des faces présentant des moitiés fructose comme les faces (1-10) et (110) semble plus rapide. Ceci serait dû à la plus grande mobilité de l'eau au contact du fructose par rapport aux molécules hydratant le glucose. L'alignement des molécules de façon à présenter une conformation compatible avec la rupture des liaisons H avec l'eau et l'incorporation des molécules de saccharose désolvatées peut prendre un certain temps. Cela se traduit par une cristallisation par pulsations, présentant une allure rythmique semblable aux anneaux de Liesegang.

Key term(s)
  • anneaux de Liesegang

Spanish

Save record 3

Record 4 1994-10-13

English

Subject field(s)
  • Analytical Chemistry
DEF

Use of acetylenic alcohols(alkynols) as corrosion inhibitors to protect steel pipe during acidizing operations undertaken to free oil from limestone formations.

French

Domaine(s)
  • Chimie analytique

Spanish

Save record 4

Record 5 1993-07-22

English

Subject field(s)
  • Electrometallurgy
DEF

Change of electrode potential with respect to a reference value.

OBS

Note-Often the free corrosion potential is used as the reference value. The change may be caused, for example, by the application of an external electrical current or by the addition of an oxidant or reductant.

OBS

Term and definition standardized by ISO.

French

Domaine(s)
  • Électrométallurgie
DEF

Variation du potentiel d'électrode par rapport à une valeur de référence.

OBS

Note - On choisit souvent comme valeur de référence le potentiel de corrosion libre. Cette variation peut, entre autres, être causée par l'imposition d'un courant extérieur ou par l'addition d'un oxydant ou d'un réducteur.

OBS

Terme et définition normalisés par l'ISO.

Spanish

Save record 5

Record 6 1993-06-28

English

Subject field(s)
  • Deterioration of Metals
DEF

The quotient of electrode potential increment and current increment.

OBS

Note-Usually the polarization resistance is measured in the vicinity of the free corrosion potential.

OBS

Term and definition standardized by ISO.

French

Domaine(s)
  • Altération des métaux
DEF

Quotient des incréments de potentiel d'électrode aux incréments de courant.

OBS

Note - En général, la résistance de polarisation se mesure au voisinage du potentiel de corrosion libre.

OBS

Terme et définition normalisés par l'ISO.

Spanish

Save record 6

Record 7 1993-06-18

English

Subject field(s)
  • Water Treatment (Water Supply)
CONT

The purpose of a neutralizing filter is to : 1. Increase pH value of water. 2. Neutralize free carbon dioxide. 3. Decrease corrosion. 4. Add alkalinity. 5. Remove dirt(turbidity and suspended matter).

French

Domaine(s)
  • Traitement des eaux
CONT

Un filtre de neutralisation a pour but : 1. d'accroître le pH de l'eau; 2. de neutraliser le gaz carbonique libre; 3. de diminuer la corrosion; 4 d'augmenter l'alcalinité; 5. d'éclaircir l'eau et de la débarrasser des matières en suspension.

Spanish

Save record 7

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