Issue link: http://metalfinishing.epubxp.com/i/49721
486 Table I. Applicability of Coating Thickness Measuring Methods Auto- Chro- Substrate Magnetic steel (including corrosion- resisting steel) Nonmagnetic stainless steels Copper and alloys Zinc and alloys Aluminum and alloys Magnesium and alloys Nickel Silver Glass sealing nickel- cobalt-iron alloys UNS No. K94610 Nonmetals Titanium BCEd B BCMa BMa BC — Method is sensitive to permeability variations of the coating. BCb BEa,b BC B B = Beta backscatter; C = Coulometric; E = Eddy current; and M = Magnetic. a bMethod is sensitive to variations in the phosphorus content of the coating. cMethod is sensitive to alloy composition. dMethod is sensitive to conductivity variations of the coating. Reprinted with permission from the ASTM Annual Book of Standards. ASTM B 569. Copyright ASTM, W. Conshocken, PA 19428-2959. BC B B B B B B B BC B BC BC B B Bc Cc Bc — BE — — CEd CMa C only on CMa brass and Cu-Be C BC B C B M Ma BCMa BMa BMa CMa — BC B C B M — BCb B — B Cb Ma Ea,b — BC B C B B BC B BC — B B B B B B B B B — B B B B — B BC B BC — B B BC BC B B BC BC — BC Bc Bc Bc Cc BcCc Bc M BM BM BM BM BM BM BCM BaCc BE E E BE BE M BM — E — — E — C C Cb Cb C C BC BC B B B B B B BCEd BC BC BC BC BC Bc Cc BcCc BE BE E E Copper CM CMa CM catalytic CbMa Cad- Palla- Rho- Tin- Cc Vitreous and Lead Non- Porcelain Nickel mium Nickel Zinc mium Gold dium dium Silver Tin Lead Alloys metals Enamels CM BCM BM BM BM BCM BCM BCM Bc M BM M