. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . a. Fig. 6.—Corroded Muntz metal condenser tube (a) Appearance of the corroded tube. No evidence of corrosion shows on the exterior, a thin unattacked layer of a. completely masks the corroded portion below. This outer layer is easily stripped off asshown. (b) Material of o (X250). Etching, concentrated ammonium hydroxide, and ammonium persulphate. The outer thin layer of unattacked a is due to some zinc being volatilized from the surface duringsome stage in the manufacturing process. IO Technologic Pape
. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . a. Fig. 6.—Corroded Muntz metal condenser tube (a) Appearance of the corroded tube. No evidence of corrosion shows on the exterior, a thin unattacked layer of a. completely masks the corroded portion below. This outer layer is easily stripped off asshown. (b) Material of o (X250). Etching, concentrated ammonium hydroxide, and ammonium persulphate. The outer thin layer of unattacked a is due to some zinc being volatilized from the surface duringsome stage in the manufacturing process. IO Technologic Papers of the Bureau of Standards
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