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The Specialist of electronics for ultrasonic testing.

1135 views
00:06 Mar-23-2010

Stan

NDT Inspector,
Canada,
Joined Jan 2009
31
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

 
01:46 Mar-23-2010

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
818
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.

 
14:55 Mar-23-2010

Stan

NDT Inspector,
Canada,
Joined Jan 2009
31
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

 
02:23 Mar-24-2010

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
818
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.

 
14:45 Mar-24-2010

Jim Draper

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