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Technical Discussions
Stan
NDT Inspector,
Canada, Joined Jan 2009, 31

Stan

NDT Inspector,
Canada,
Joined Jan 2009
31
00:06 Mar-23-2010
Etching for Penetrant

I hope that someone can offer some advice here.
What is an appropriate etching technique, etchant and times, for carbon steel items that may have been peened over, to open any surface flaws to allow a Penetrant Examination.
Stan

    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 834

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
834
01:46 Mar-23-2010
Re: Etching for Penetrant
In Reply to Stan at 00:06 Mar-23-2010 (Opening).

Stan,

Since your dealing with carbon steel, why don't you use MT? If you want to do PT, you are obviously looking for surface or very near surface defects. MT would be much faster.

    
 
 
Stan
NDT Inspector,
Canada, Joined Jan 2009, 31

Stan

NDT Inspector,
Canada,
Joined Jan 2009
31
14:55 Mar-23-2010
Re: Etching for Penetrant
In Reply to Michel Couture at 01:46 Mar-23-2010 .

Michel:
The items that I am dealing with are specimens with known flaws that are going to be used for training and testing purposes. At present, the known flaws show only marginal detectability using typical penetrant techniques, and I am hoping to increase the detectability of these flaws by etching the surface.
Any other suggestions would be welcomed.
Stan

    
 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 834

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
834
02:23 Mar-24-2010
Re: Etching for Penetrant
In Reply to Stan at 14:55 Mar-23-2010 .

Stan,

Why don't you contact a local guy that does frame off restauration on classic cars. Some will do an acid dip. I'm sure you can find someone around Edmonton.

    
 
 
Jim Draper
Consultant, ASNT Level III MT PT RT VT
Draper NDT, USA, Joined Jul 2009, 99

Jim Draper

Consultant, ASNT Level III MT PT RT VT
Draper NDT,
USA,
Joined Jul 2009
99
14:45 Mar-24-2010
Re: Etching for Penetrant
In Reply to Michel Couture at 02:23 Mar-24-2010 .

You could dip the part in muratic acid (available at any local hardware store) for just a second, then rinse and dry the part. Perform liquid penetrant testing, if the results are not satisfactory, repeat the process with a little longer time in the acid. It may be time consuming, but it should work.

    
 
 

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