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HE - Lawrence gauge

(-----) 2006

I'm working on some problems concerning hydrogen embrittlement. Reading some articles and searching the net for further information, I more and more often read about a "Lawrence gauge" that help to control the hydrogen wether in the galvanizing bath or after the process.

Has anyone any suggestions where I can find information how this gadget works or where I can find a picture or even a supplier for this thing.

Thanks alot

Best regards,

Marten Kleihauer
aircraft engines - Hamburg, Germany


ASTM F326 [affil. link to spec at Techstreet], "Standard Test Method for Electronic Measurement for Hydrogen Embrittlement from Cadmium-Electroplating Processes" describes this. It requires special equipment; a list of manufacturers is available from ASTM (one is http://www.lawrence-electronics.com).
"This test method covers an electronic hydrogen detection instrument procedure for measurement of plating permeability to hydrogen. This method measures a variable related to hydrogen absorbed by steel during plating and to the hydrogen permeability of the plate during post plate baking."

A simplified summary: A metal shell (cylinder closed at one end and plugged at the other), masked off (painted) except for a specific area, is pretreated and plated. The shell is then rinsed and dried, and the plug is replaced with a vacuum ion gauge attachment. The cylinder is then heated (to a precise temperature) to facilitate the release of hydrogen into a vacuum. The recorded output gives both the rate and amount of hydrogen released.

The masking would not withstand the (hot dip) galvanizing process; perhaps you mean zinc electroplating? The method can test for hydrogen pickup from acid pickling and cathodic cleaning as well as from electroplating. "Hydrogen Embrittlement: A Guide for the Metal Finisher" by Craig Willan (available on the Internet) gives hydrogen absorbed from various acid treatments.

Ken Vlach [dec]
- Goleta, California

contributor of the year Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.


Ed. note: That hydrogen embrittlement article is long enough and detailed enough to be truly useful, while short enough to be read in fifteen or twenty minutes. Score another nice find for Ken Vlach. --Ted

May 5, 2009

Dear Marten Kleihauer

I am now looking very similar issue that you were interested at the time. I need to measure hydrogen diffusion (uptake) and also hydrogen embrittlement of some specimens. Did you able to contact with this company? And did you have a chance to establish a this kind of experimental set-up in your laboratory or facility? What can you say as advice or suggestion regarding to this subject.

Kind Regards

Osman Malik Atanur
- Turkey

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