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Hydrogen embrittlement failures on notch test bars



(-----) 2004

I am experiencing difficulty in getting hydrogen embrittlement notch bars to pass the 200 hr 75%UTS load test in my hard chrome and cadmium solution. ASTM 519-97.

The problem started a few weeks ago when we received a new bath of bars. They come with a COC and presumably complient. The method for plating the bars has not changed as far as I can tell. I have increased the baking time but this has not improved the situation. The breakages occur at random intervals no real pattern here to determine possible causes.

I have been doing this testing for 15 odd years and this is the first time I've had this many failures without being able to rectify in a timely way.

John (Henry) Ford
Electroplating Aero and General Engineering - Ipswich, Queensland, Australia
^


2004

Try doing a hydrogen back out on the notched tensile specimens before you plate them.

William Calvert
- York, Nebraska, USA
^

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