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A quantitative determination of the porosity of various precious metal platings is accomplished by a test method that utilizes chronocoulometry. The test is described in the following.
English (United States)
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Determination of the Porosity of Precious Metal Platings using
A quantitative determination of the porosity of various precious metal platings
is accomplished by a test method that utilizes chronocoulometry. The test is
described in the following.
A sample to be tested is placed in a solution of water and a supporting
electrolyte. A reference electrode and a counter electrode are placed in the
solution. Using a potentiostat, the potential of the sample is stepped down from
a potential at which the oxidation of Ni does not occur to a potential at which the
oxidation does occur. The current that flows between the sample and the
counter electrode is integrated for the length of time of the oxidation step. The
integrated charge of coulombs is proportional to the exposed area of Ni in the
plated deposit. By refering to a calibration chart made by performing the same
test on plated samples of known exposed areas, a quantitative evaluation of the
exposed Ni can be made.
The described test method can be illustrated in the following example.
Flat coupons of brass are plated with 100 microinches of Ni. A
small section of the Ni plated coupon is masked, 1.0% of the area,
then plated with a thick, soft Au plate ( 200 microinches). The
thick Au plating is assumed to be nonporous. The masked area is
stripped leaving 1.0% of the area as exposed Ni. A similar sample is
plated without the exposed Ni. The test method is then used on the
samples with the following...