×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Metal that does not corrode in low pH
2

Metal that does not corrode in low pH

Metal that does not corrode in low pH

(OP)
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.

RE: Metal that does not corrode in low pH


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
 

RE: Metal that does not corrode in low pH

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

RE: Metal that does not corrode in low pH

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.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Metal that does not corrode in low pH

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.

RE: Metal that does not corrode in low pH

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

RE: Metal that does not corrode in low pH

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.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Metal that does not corrode in low pH

2
Why metal?  At that thickness couldn't you use something like High Density Polyethelyne?  Or Fiberglass over wood like a boat?

David

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources