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Erratic Hydrogen Embrittlement Bake

Does any one have a chart, graph, equation etc. to show the effect of time and temperature, that shows the effect of the interruption of the baking cycle and the lowering of the temperature and whether this does remove the majority of the hydrogen? I have a situation where a MLG cylinder (critical part) was chrome plating and baked within 1 hour after plating to a temperature of 375 degrees F; however, the furnace control that registered the furnace was defective such that the furnace chart showed varying time at temperature. The chart register varying temperatures between 250 degrees F to 390 degrees F. By breaking down the furnace chart, it appears that the total time above 300 degrees F was approximately 5.1 hours and below 300 degrees F it was approximately 4.5 hours. After this erratic cycle, the furnace control was fixed (all the time the part was still in the furnace) and the part was re-baked for 13.25 hours at 375 degrees F. I am not sure if this acceptable. Can anyone respond to this inquiry.

Thank you.

Thomas Posten
- Long Beach, California, USA
2004

That is totally up to the customer.

James Watts
- Navarre, Florida
2004

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