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How to present the Nickel Chrome Plating in International Standard

Hi! I'm from Malaysia.
I would like to know how do people present the Nickel Chrome Plating in international Standard?
e.g., : Ep-Fe/Ni 20d, Cr 0.15
what do the above Ep-Fe stand for?
what do the 20d stand for? is it the thickness of Nickel?
Thanks you for helping me

Michael Chng
Manufacturer of Sprocket - Prai, Pulau Pinang, Malaysia
2005

2005

Hi, Michael Chng
a) The chemical symbol followed by a slash mark, is for the basis metal or for the principal metal if is an alloy,
b)The symbols after the slash mark refers to the coating.
e.g: Fe/Ni20d Cr r
The base material is iron or an alloy of iron the coating is nickel duplex with 20 micrometers (minimum) and regular chromium (0,25 micrometers).
For more information you can consult the ASTM B456 standard.

Best Regards,

José Francisco Costa
- Aveiro, Portugal

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