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 C (87 to 120 F), and 207 kPa (30 psi). Below the
dezincified layer is the bright yellow, intact, admiralty brass outer tube wall. Width of figure is 2.5 mm (0.1 in.).
Courtesy of James J. Dillon. Permission granted by Nalco Chemical Company, 1987