Form of corrosion where components of an alloy are preferentially leached
In metallurgy, selective leaching, also called dealloying, demetalification, parting and selective corrosion, is a corrosion type in some solid solution alloys, when in suitable conditions a component of the alloys is preferentially leached from the initially homogenous material. The less noble metal is removed from the alloy by a microscopic-scale galvanic corrosion mechanism. The most susceptible alloys are the ones containing metals with high distance between each other in the galvanic series, e.g. copper and zinc in brass. The elements most typically undergoing selective removal are zinc, aluminium, iron, cobalt, chromium, and others.
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In metallurgy, selectiveleaching, also called dealloying, demetalification, parting and selective corrosion, is a corrosion type in some solid solution...
NiAl. The removal of Al from some phases but not others is known as "selectiveleaching". The NiAl phase has been shown to provide the structural and thermal...
principally in metal alloys. The less noble metal of the alloy, is selectivelyleached from the alloy. Removal of zinc from brass is a more common example...
divided into three general areas: Leaching Solution concentration and purification Metal or metal compound recovery Leaching involves the use of aqueous solutions...
self-healing property of the passive film make the steel stainless. Selectiveleaching often involves grain boundary depletion mechanisms. These zones also...
the voids at high pressure and initiates cracks in the steel. This selectiveleaching of carbon is a more serious loss of strength and ductility. HTHA can...
sulfides and hydrogen sulfide smell. On cast iron, a graphitic corrosion selectiveleaching may be the result, with iron being consumed by the bacteria, leaving...
underground leaching of uranium ores. In-situ leaching of copper was done by the Chinese by 907 AD, and perhaps as early as 177 BC. Copper is usually leached using...
copper. Brasses can be sensitive to selectiveleaching corrosion under certain conditions, when zinc is leached from the alloy (dezincification), leaving...
temperature range of 500 to 1200 °C. Internal oxidation is distinct from selectiveleaching. "ASM Handbook Vol.13 Corrosion", ASM International, 1987, page 8...
500 °C. At high temperatures may boil and create voids. Prone to selectiveleaching in some environments, which may cause joint failure. Traces of bismuth...
processing methods such as flotation, agitation, and vat leaching. Additionally, dump leaching is an essential part of most copper mining operations and...
catalysis is leaching, a form of deactivation where active species on the surface of a solid catalyst are lost in the liquid phase. Leaching is detrimental...
fourth incarnation of the draft came into being in 1940, through the Selective Training and Service Act; this was the country's first peacetime draft...
over the coating due to sulfur-containing compounds from the solder mask leaching into the plating bath. The quality and other aspects of ENIG coatings for...
The Selective Service Act of 1917 or Selective Draft Act (Pub. L.Tooltip Public Law (United States) 65–12, 40 Stat. 76, enacted May 18, 1917) authorized...
known as weeds. Selective herbicides control specific weed species while leaving the desired crop relatively unharmed, while non-selective herbicides (sometimes...
sum of contributions from both mechanisms (leaching + dissolution): NRi=NRxi+NRh. Diffusion-controlled leaching (ion exchange) is characteristic of the initial...
leaching has been proven to be effective on ores with high soluble copper values or ores which experience preg-robbing. Leaching through bulk leach extractable...
to ten times its dry volume. It occurs in soils which have had little leaching, hence it is found in arid regions, although it may also occur in humid...
damage human health, environment, and crops. Together with runoff and leaching, drift is a mechanism for agricultural pollution. Some drift results from...
laterites (or oxide type) are highly enriched in iron due to very strong leaching of magnesium and silica. They consist largely of goethite and contain 1–2%...
(1918), also known as the Selective Draft Law Cases, was a United States Supreme Court decision which upheld the Selective Service Act of 1917, and more...
Rhacodactylus leachianus, commonly known as the New Caledonian giant gecko, Leach's giant gecko, leachianus gecko, or simply Leachie, is the largest living...
into aqueous sulfuric acid, usually in a heap leaching or dump leaching. The resulting pregnant leach solution is purified by solvent extraction (SX)...
leaching (57% of world production) or by conventional underground or open-pit mining of ores (43% of production). During in-situ mining, a leaching solution...
physical and chemical methods include magnetic separation, froth flotation, leaching etc., whereby the impurities and unwanted materials are removed from the...
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