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topic 597

Chrome plating leaf springs


(1996)

Q. I have been told that decorative chrome plating effects the quality of the material it is applied to. What does it do? and is there anyway that it can be reversed without effecting the quality of the finish. In particular I am wondering about plating automotive leaf springs and not changing their inherent properties.

Thanks in advance

Bert Beckman


Current Solutions to Hydrogen Problems in Steels

(includes 7 papers / 34 pages on electroplating)

A. boing...boing...boing...CRACK!

The problem here, Bert, and it's a very big one, is hydrogen embrittlement. High strength steels (spring steels are high strength steels) will absorb hydrogen from such processes as pickling and plating -- especially chrome plating -- and become brittle like glass.

Often the hydrogen can be baked out; piston rings and landing gear, for example, are sometimes chrome plated. And I've seen chrome plated coils springs on motorcycles. Baking temperatures are low enough that they will not affect the spring properties, so, if you can get the hydrogen out, it can work.

But you must get the parts into an oven immediately after plating; you can't fix the problem later. And your leaf springs might break right in the chrome plating tank, before they even can get to an oven.

You can probably develop a chromium plating process for automotive springs but it may take a lot of trial and error, and I am confident that it will involve multiple hydrogen embrittlement relief steps. Good luck!

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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