Zinc Alloy- 

Zinc is used to make many useful alloys. Brass, an alloy of Zinc that contains between 55% and 95% Copper, is among the best known alloys. The use of Brass dates back 2500 years and was widely used by the Romans and is commonly used today, particularly in musical instruments and many hardware applications that must resist corrosion. Zinc is alloyed with Lead and Tin to make solder, a metal with a relatively low melting point used to join electrical components, pipes, and other metallic items. Other Zinc Alloys include Nickel Silver, typewriter metal, and German Silver.

Roughly one third of all metallic Zinc produced today is used in galvanizing. Zinc is used as a protective coating to an item that is experiencing corrosion. The Zinc can be applied to the object by dipping the item into a pool of molten Zinc, but most often this is accomplished through electroplating. Sacrificial Zinc Anodes are used in cathodic protection systems to protect exposed iron from corrosion. Metallic Zinc is also used for many other applications, including, but not limited to, to make dry cell batteries, roof cladding and die castings.

Applications:

Die Casting Alloys including Zamak Alloys; Zinc Base Master Alloys for Alloy Additions, Special High Grade Zinc for Karat Gold and other high purity applications; Pure Zinc and Zinc Alloys for Plating; Alloys for Metal Joining

Sourcing from: http://www.belmontmetals.com/product/zinc-alloys/

 

Aluminium Alloy- 

Aluminium alloys are alloys in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and extrusions. Cast aluminium alloys yield cost-effective products due to the low melting point, although they generally have lower tensile strengths than wrought alloys. The most important cast aluminium alloy system is Al–Si, where the high levels of silicon (4.0–13%) contribute to give good casting characteristics. Aluminium alloys are widely used in engineering structures and components where light weight or corrosion resistance is required.[1]

Alloys composed mostly of aluminium have been very important in aerospace manufacturing since the introduction of metal-skinned aircraft. Aluminium-magnesium alloys are both lighter than other aluminium alloys and much less flammable than alloys that contain a very high percentage of magnesium.

Aluminium alloy surfaces will develop a white, protective layer of aluminium oxide if left unprotected by anodizing and/or correct painting procedures. In a wet environment, galvanic corrosion can occur when an aluminium alloy is placed in electrical contact with other metals with more positive corrosion potentials than aluminium, and an electrolyte is present that allows ion exchange. Referred to as dissimilar-metal corrosion, this process can occur as exfoliation or as intergranular corrosion. Aluminium alloys can be improperly heat treated. This causes internal element separation, and the metal then corrodes from the inside out. Aircraft mechanics deal daily with aluminium alloy corrosion.

Sourcing from:https://en.wikipedia.org/wiki/Aluminium_alloy