New shower enclosure corroded already. Incompatible metals used, steel screws and aluminium.

[benaround3]

We had this "Lakes" brand shower enclosure fitted 3 years ago and already corroding as shown. Even worse, one of the fixing screws is corroded in place and sheered off.

I need to replace the steel self tappers with aluminium ones but can't get anything smaller than 4mm, I need 3.5mm.

Then I need to remove corrosion as best I can and corrosion proof the area.

Does anyone have suggestions or experience?

But why does a firm like Lakes supply two different metals that are obviously going to corrode when they get damp. Are all shower enclosures made like this?

 

[oldbuffer]

1. So far as I know you can't get aluminium self tappers. The metal is too soft to cut a thread.
2. If you mean 3.5 mm aluminium machine screws, search for Aluminium M3.5. Doubt they'd be strong enough.
3. Short of Titanium, which is very expensive, most metals will react with aluminium.

 

[Madrab]

Will also depend on your water type, harder water tends to be slightly ionised and can then act as an electrolyte. The harder the water the worse it can be.