×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Earliest sign of red rust (corrosion) on exposed steel

Earliest sign of red rust (corrosion) on exposed steel

Earliest sign of red rust (corrosion) on exposed steel

(OP)
Dear Sir/Madam

As a marine surveyor I sometime deal with containerised cargoes damaged by water (sea/rain) having entered the container through holes caused by either corrosion or mechanical damage usually by container spreaders.

On occasion it has been necessary, (without the assistance of metallurgists for cost-conscious principals), to provide an approximate "age" of the damage so as to try and estimate, without guarantees, the most likely place where the damage may have occurred (for liability/recovery purposes).

Is there an acknowledged period of time following physical damage to steel plate (in otherwise good condition and without any prior damage), within which the external sign of red rust (ferrous oxide/corrosion) is just NOT visible but that, after such period of time, red rust will be visible?

By way of illustration:  

The roof of a steel shipping container is pierced by the metal spear of the lifting spreader today, 17 March (Sydney time), exposing the steel.

Will the exposed steel surfaces develop red rust within say 12 hours? 24 hours? some other period of time?  

Thanks and regards

Glenn Mathias

RE: Earliest sign of red rust (corrosion) on exposed steel

Kinetics depend upon temperature mainly, but rust will definitly become visible within 24 hours. It's an easy experiment to set up for your particular conditions. Just abrade some of the same steel and clock it.

Michael McGuire
http://stainlesssteelforengineers.blogspot.com/

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close