This International Standard specifies the method of using coating thickness instruments of the magnetic type for non-destructive measurements of the thickness of electrodeposited nickel coatings on magnetic or non-magnetic substrates.
The method may not be applicable to autocatalytic (electroless) nickel coatings depending on their chemical composition.
For the purposes of this International Standard, two types of nickel coating are distinguished :
a) nickel coatings on magnetic substrates (type A coatings);
b) nickel coatings on non-magnetic substrates (type B coatings).
It should not be assumed that all instruments are applicable to both types of coating.
The effective measuring ranges of instruments using the prin-ciple of magnetic attraction are up to 50 (jm for type A coatings, and up to 25 u.m for type B coatings.
For instruments using the principle of reluctance, the effective ranges are much greater and measurements up to 1 mm, or more, can be made on both types of coating.