What sort of temperature would it take to damage extruded anodized aluminium?

[Trevorleach]

Boat pontoon made from anodised extruded sections quite old, boat caught fire damaging the wood planking/cable and water pipes, now everyone is worried as they think it could have effected the structural integrity, also there might be some warpage but no one is sure if it was warperd before the fire or not.

 

[Brad93]

Boat pontoon made from anodised extruded sections quite old, boat caught fire damaging the wood planking/cable and water pipes, now everyone is worried as they think it could have effected the structural integrity, also there might be some warpage but no one is sure if it was warperd before the fire or not.

Some aluminium alloys, and especially aluminium welds made with certain filler metals, have an in service limit of around 150°C.
Basically the alloying elements start moving around in the crystal lattice which usually means gathering at grain boundaries.
In a salt water environment that could be exasperated by corrosion.

Would need to know base metal composition, filler metal composition and an accurate idea of what temperature the fire reaches.

 

[voipio]

The first significant changes that occur to aluminium with short elevations in temperature, such as a fire, would be the crystalline structure changes that lead to annealing. Aluminium starts to anneal at about 300 degC, though the actual temperature will depend on the particular alloy being used. The problem is, it's probably not possible to determine what temperatures were actually reached by the pontoon structure in the fire. The fact that there may be warpage would suggest that the material, or at least some parts of it, either reached softening temperature, or that the warpage was caused by the thermal expansion of the structure by heat, or both. It's probably best left to a structural engineer to examine, and determine the likely extent of the damage.

 

[mike os]

Needs a proper inspection… doesn’t take much heat to mess things up

 

[Trevorleach]

Thanks to all, sounds like its had it.

 

[The_Yellow_Ardvark]

In the fire business a working guide line is.
Any alloy affected by heat from a fire must be considered damaged or compromised.Thus it should be replaced.