Real nickel plating is pretty tough and only mechanical abrasion or a fairly strong acid will remove it. If it comes off more easily, the underlying metal wasn't prepped properly in the first place.
...rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual. -- Thomas Jefferson