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1.1 ,This guide covers the use of the spot test for the measurement of thicknesses of electrodeposited chromium coatings over nickel and stainless steel with an accuracy of about ±,20 ,% (Section 9). It is applicable to thicknesses up to 1.2 μ,m.2
Note 1: ,Although this test can be used for coating thicknesses up to 1.2 μ,m, there is evidence that the results obtained by this method are high at thicknesses greater than 0.5 μ,m.3 In addition, for coating thicknesses above 0.5 μ,m, it is advisable to use a double drop of acid to prevent depletion of the test solution before completion of the test.