Impurities aluminum-based alloys

The amount of impurities in the eutectic layers of the weld is one order higher than their mean content in the alloy for this reason, aluminum-based alloys of high purity are recommended to increase the joint strength. 

Cr C Cr C chromium iton(l l) [12052-89-0] CrFe (c phase), and chromium iron molybdenum(12 36 10) [12053-58-6] Cr 2F 36 o Q phase), are found as constituents in many alloy steels Ct2Al23 and CoCr ate found in aluminum and cobalt-based alloys, respectively. The chromium-rich interstitial compounds, Ci2H, chromium nitrogen(2 l) [12053-27-9] Ct2N, and important role in the effect of trace impurities on the... 

Fifty years ago, intergranular corrosion of the zinc—4% aluminum casting alloys was a problem because of high impurity levels, notably of lead, tin, and cadmium. The subsequent introduction of 99.99% zinc as the base for these casting alloys eliminated intergranular corrosion under normal service conditions. However, an inherent tendency for intergranular corrosion exists, and this defect can still occur if pure zinc-aluminum alloys are exposed to temperatures above about 70°C under wet or damp conditions. Research has... 

As sodium can be used to eliminate impurities contained in metals, one could consider it as a means for producing wanted compounds and alloys. This field of application is rather large and the following cases of alloy production, mainly based on the strong halogen affinity of this metal, may be examined alkaline earth metal alloys, calcium sodium alloys and calcium metal derived from them, and sodium alloys, especially those with potassium, when calcium, magnesium, cerium, aluminum, uranium, thorium, and titanium, for instance, are introduced into a base metal. 

GLUE. Originally an impure form of gelatin. In more modem times, glue is one of many types of adhesives used for bonding. In laboratory tests, most adhesives were found to be either innocuous or protective to aluminum alloys. However, exceptions were found and included the alkaline water base latex adhesives, acetic anhydride adhesives, and adhesives that have been made electrically conductive by the addition of copper, silver, or carbon. Such adhesives should be used with caution and with the knowledge that corrosion could develop. Adhesives are used with aluminum alloys in many applications. SeeaIsoRef (I)p. 133. (3) pp. 124, 199, 231. 233. (4) pp. 107, 115, R. L. Patrick, Editor. Treatise of Adhesion and Adhesives," Vol. Ill, Marcel Dekker, New York, 1973. 

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