Letter 3607

Phosphor bronze hydrogen embrittlement? 

Wed -

I have a diaphragm type spring 5.5 inch dia x .020 thick of phosphor bronze (ASTM B139) which is required to be electroless nickle plated. My question is will hydrogen embrittlement be a problem with this process as with non electroless plating? We are presently waterjet machining the part and then hand polishing to 20 micro inch before plating.

Howard Waller
- Muskogee, OK

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I have never seen a reference to a problem with hydrogen embrittlement on any bronze.

1st, it is probably too soft to be a problem.

2nd, It is normally associated with grain boundaries and carbides, but not always.

I will be looking forward to the answer from somebody that knows , for sure.

James Watts
- Navarre, Florida

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I plated a 0.5 mm dia phosphor bronze wire for my customer. After two weeks he came back complaining that the wire is extreemly brittle.

I did a fresh job for him with anodic cleaning and Asymmetric A.C. plating and that worked.

I have not come across any reference that says explicitly that phosphor bronze is prone to hydrogen embrittlement. Vijay

Yashawant Deval
electroplating shop Pune, maharashtra, India

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