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Hydrogen Embrittlement of 1144 stressproof shafts by stripping in HCl



October 17, 2008

We zinc plate 1144 stressproof shafts for corrosion resistance. A batch of shafts came in with poor/ uneven zinc plating so our quality department sent the shafts back to get re-plated. Normally we do not require a bake after plating because 1144 does not have high enough strength (1144 is 100 ksi YS) to make it a hydrogen embrittlement risk. However, I am reading that the HCl bath used to remove the zinc plating could cause adhesion of hydrogen ions. Should I be concerned? Do I need to require a bake after cleaning?

Andrew Nelson
mechanical engineer - Omaha, Nebraska, USA



October 28, 2008

Yes, Bake process should be performed. Please check recommended time and temperature.

Carlos Carrera
- MIAMI, Florida, USA


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