Fig. 2 Plug-type dezincification in an α-brass (70Cu-30Zn) exposed for 79 days in 1 N NaCl at room temperature. Note porous structure within the plug. Dark line surrounding the plug is an etching artifact. Total width shown is 0.56 mm (2.2 mils). More

Fig. 3 Uniform-layer dezincification in an admiralty brass 19 mm ( 3 4 in.) diameter heat-exchanger tube. The top layer of the micrograph, which consists of porous, disintegrated particles of copper, was from the inner surface of the tube that was exposed to water at pH 8.0, 31 to 49 More

Fig. 35 Micrograph showing difference in dezincification of inside and outside surfaces of a plated copper alloy C26000 (cartridge brass, 70% Cu) pipe for domestic water supply. Area A shows plug-type attack on the nickel-chromium-plated outside surface of the brass pipe that initiated below More

Fig. 1 Plug-type dezincification in an α-brass (70Cu-30Zn) exposed for 79 days in 1 N NaCl at room temperature. Note porous structure within the plug. The dark line surrounding the plug is an etching artifact. 160× More

Fig. 2 Uniform-layer dezincification in an admiralty brass heat-exchanger tube. The top layer of the micrograph, which consists of porous, disintegrated particles of copper, was from the inner surface of the tube that was exposed to water at pH 8.0, 31 to 49 °C (87 to 120 °F), and 207 kPa (30 More

Fig. 22 Dezincification of a brass alloy component adjacent to a stress-corrosion crack as observed (a) visually and (b) in a metallographic section. A lower concentration of zinc was observed by energy-dispersive x-ray spectroscopy in (d) an affected area compared to (c) an unaffected area More

Fig. 25 Plug-type dezincification of a nominal 60/30 copper-zinc yellow brass in a potable water environment More

Fig. 26 Layer-type dezincification of C693 brass in potable water More

Fig. 27 Micrograph of fracture due to dezincification in threaded brass plumbing fitting with a nominal composition of 70/30 copper-zinc in a potable water environment More

Fig. 28 Hole in C36000 brass fitting as a result of dezincification in a potable water environment More

Fig. 1 Plug-type dezincification cross section in a yellow brass (C26000, cartridge brass) tube. Original magnification 15×. Source: Used with permission of ASTM International More

Fig. 2 Layer-type dezincification cross section in yellow brass (C26000, cartridge brass) threaded fastener. Original magnification 15×. Source: Used with permission of ASTM International More

Fig. 40 Views of a through-wall perforation of a chromium-plated α brass (70Cu-30Zn) tube removed from a potable water system due to dezincification. (a) Macroview of tube. (b) Inside diameter surface of the tube shown in (a), depicting localized green deposits at the areas of dezincification More

Fig. 40 Views of through-wall cracking of an alpha leaded brass (62%Cu-35%Zn-3%Pb) thermowell shank removed from a potable hot water system due to dezincification. (a) Macroview of thermowell. (b) Thermowell after sectioning longitudinally to separate mating fracture surfaces associated More

Fig. 6 Copper alloy C26000 steam-turbine condenser tube that failed by dezincification. (a) Section through condenser tube showing dezincification of inner surface. 3 1 2 ×. (b) Etched specimen from the tube showing corroded porous region at the top and unaffected region below. 100× More

Fig. 6 Copper alloy C26000 steam-turbine condenser tube that failed by dezincification. (a) Section through condenser tube showing dezincification of inner surface. Original magnification: 3.5×. (b) Etched specimen from the tube showing corroded porous region at the top and unaffected region More

Fig. 9 Optical microscopy image of cross section of as-polished fracture surface showing dezincification. Original magnification: 64.5× More

Fig. 12 Mounted as-polished cross section of failed unit. Pink region shows the extent of dezincification; yellow region is unaffected brass. More

Fig. 11 Optical microscopy image of as-polished fracture surface showing duplex microstructure and a less-advanced region of dezincification. Original magnification: 520× More