Summary for hard chrome plating Discussion
hard chrome plating and 7-stage phosphatizing are the key concerns in this thread about a steel e-bike frame with a welded hard chrome plated hollow pin and a matching hard chrome plated plunger. Ashish Mohan Sharma of Chennai asks whether the plated pin can withstand the full seven-tank phosphating process before powder coating. The reply is cautious: the answerer says they highly doubt exposed hard chrome can properly survive 7-stage phosphatizing and believes it must be flawlessly masked to avoid damage or process issues. No one offers a contrary view in the excerpt, so the practical takeaway is to protect the chrome surfaces rather than assume they will tolerate the pretreatment cycle.
Q. Dear all,
We have a steel tube weldment (e-bike frame) which includes a hard chrome plated hollow pin (hollow turned rod). It has a plunger sliding in it, which is also hard chrome plated.
We manage to weld the chrome plated part to the steel frame. The frame is further powder coated.
My question is: Whether this hard chrome plated hollow pin will sustain 7 tank phosphating process or not?
ASHISH MOHAN SHARMA
– Chennai, India
December 29, 2018
A. Hi Ashish. I highly doubt that exposed hard chrome can properly survive 7-stage phosphatizing. I think it needs to be flawlessly masked.
Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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December 2018
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