Methods for Measuring Thickness of Cadmium Plate

There are many nondestructive and destructive methods for measuring the thickness of cadmium deposits (Table 11). The most widely used are magnetic, coulometric, and eddy-current methods, as well as x-ray spectrometry and microscopic cross-sectioning. Other reliable methods, including the chemical drop test, may be used. Detailed information on most methods can be obtained from ASTM specification B 659-85 ("Standard Guide for Measuring Thickness of Metallic and Inorganic Coatings") (Ref 1) and ISO Standards.

Table 11 Methods applicable to measuring cadmium coating thickness on selected ferrous and nonferrous substrates per ASTM B 659

Beta backscatter(a)

Coulometric(b)

Magnetic(c)

Magnetic steel (including corrosion-resisting steel)

X

X

X

Nonmagnetic stainless steels

X

X

Copper and alloys

X

X

Zinc and alloys

X

Aluminum and alloys

X

X

Magnesium and alloys

X

Nickel

X

X

Glass sealing nickel-cobalt-iron alloys (UNS No. K94610)

X

X

Nonmetals

X

X

Titanium

X

Source: Ref 1

Reference cited in this section

1. 1989 Annual Book of ASTM Standards, Vol 2.05 (Metallic and Inorganic Coatings; Metal Powders, SinteredP/M Structural Parts), ASTM, 1989, p 441-443

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