why 5052 aluminium alloy sheet to corrosion in marine atmospheres is excellent ?-全讯新

2017-09-04 12:19:57

5052 aluminium alloy sheet widely application in the field of ocean,why 5052 aluminium alloy sheet to corrosion in marine atmospheres is excellent ? 

fabrication aluminium 5052 is not generally hot worked. it is very readily cold formable in the annealed condition, as it is ductile. forming loads and tool & press wear are generally less than with carbon steel. for piercing and blanking the punch to die clearance should be about 7% of the thickness per side for the h32 & h34 tempers. sharp tools are required. 

indicative minimum bend radii for 90o cold forming for various thickness, t mm

machinability 5052 is readily machinable by conventional methods. it should be machined at high speed with copious lubrication to avoid thermal distortion of the workpiece. sharp tools are essential. high speed steel or tungsten carbide may be used. cuts should be deep and continuous, with high cutting speeds. woodworking machinery may be suitable for short runs.welding 5052 is readily weldable by standard techniques. it is frequently welded with gtaw (tig) or gmaw (mig). aluminium must be very dry & clean to avoid contamination & porosity of the weld. filler metals 1100, 4043 or 4047 are used. 4043 is the most crack tolerant. best colour match is obtained with 1188 filler metal. shielding gas must be dry & free of hydrogen. 

heat treatment

5052 marine grade aluminium alloy sheet is annealed at 345oc, time at temperature and cooling rate are unimportant. stress relief is rarely required, but can be carried out at about 220oc. if loss of strength is of concern, stress relief tests should be conducted.

typical strength and ductility of alloys 5005 & 5052 in the h32 & h34 tempers

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