IXLR8,


Chromium is a much harder metal than nickel.
Its application to the brass is done by electrolysis, i.e. electroplating, which creates a stronger bond between the metals.

So the chromium is much less likely to peel than nickel is.

You can still find original Super Tigre engines, from the eighties, or maybe even the late seventies, that still have the ABC intact, after years of use. This is very unlikely with ABN.

ABN was adapted just because it reduces the total production costs (waste handling is a production cost).
The YS Nikasil like method uses nickel too, but it does not peel and provides porosity for lubrication.