3.2 Non-ferrous metals

Frage	Antworten
non ferrous metals	metals that do not contain iron
aluminium	-widely used, often in alloy form -duralium: alloy (used in aircraft manufacturing) which also contains copper and magnesium -al can also be alloyed with titanium to produce very stron, lightweight metals
copper	-excellent electrical conductor ->use in electric wires -good ductility -> suitable for pipes -widely used in alloys: ->brass(messing) (copper and zinc) ->bronze (copper and tin, sometimes lead(blei))
silver	-PRECIOUS METAL ->reference to its high cost -best electrical conductor
gold	electrical conductor corrosion resistant
plating	covering with a thin layer of metal to protect steel from corrosin example: galvanizing (zinc plating)
hot-dip galvanize	placing metal in molten zinc
electro-galvanize	-type of electroplating -steel component is placed in a liquid (electrolyte) -connected do the negative terminal (to become the cathode) -piece of zinc is also placed in the electrolyte+connected to the positive terminald (anode) of the supply. -an electric current then flows between the pieces of metal, through the electrolyte. this causes a chemical reaction, which deposits zinc on the cathode, plating the component.
anodizing	related process -to protect aluminium -component to be anodized is connectet to the positive terminal+placed in electrolyte, whith a cathode. as electricity flows, aluminium oxide is deposited on the anode. as this is harder than aluminium metal, it provides protection

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