. Typical cases of the deterioration of Muntz metal (60:40 brass) by selective corrosion . FlG. 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 as shown.(6) Material of a (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 during some stage in the manufacturing process. IO Technologic Papers o
. Typical cases of the deterioration of Muntz metal (60:40 brass) by selective corrosion . FlG. 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 as shown.(6) Material of a (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 during some stage in the manufacturing process. IO Technologic Papers of the Bureau of Standards
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