Metal that does not corrode in low pH 2

[Ipetu]

I have a small concrete monitoring weir at a mine site. A 20 mm thick metal plate with a V-notch is required to measure water levels. What is the best type of metal to be used for this application so that the metal does not corrode in the low pH mine water.

 

[strider6]

a stainless steel could be a solution but it will be necessary to have more info on water chemistry, ph, design life?

S

Corrosion & Rust Prevention Control

 

[Ipetu]

Water pH in the 3 to 5 range, Cu as the main metal. Design life of 20 years.

 

[EdStainless]

Any chlorides? That is what will be the driver.
If they are below 5,000 ppm try 2205. It is strong enough to give you some erosion resistance also.

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Plymouth Tube

 

[micalbrch]

If pH is far below 3 and if money isn't a issue for you, Hastelloy alloys or Titanium can be a good choice. But before you spend the money you should answer the questions above (pH value, chloride content) as mine water usually is not so acidic.

 

[cloa]

Titanium would need oxidise ions but given this mine water that is probably not an issue

 

[EdStainless]

Given how soft Ti is I would suggest that he look at:
a) 2205
b) AL-6XN, 1925hMo, 26-6Mo, 2507, Zeron 100
c) C-276, C-22, 59, 686

In that order of increasing corrosion resistance.

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Plymouth Tube

 

[zdas04]

Why metal? At that thickness couldn't you use something like High Density Polyethelyne? Or Fiberglass over wood like a boat?

David