. Typical cases of the deterioration of Muntz metal (60:40 brass) by selective corrosion . a. Fig. 4.—Corroded Muntz metal sheathing (a) Before attack; the light-colored 18 matrix fills in between the a crystals. (6) After 7 years exposure to sea water (see Fig. 1, c) the P constituent has been entirely changed; the a, apparently not at all. The numerous twinned crystals in the a is indicative that the metal was annealed before in both cases. (X500.) Etching, ammonium hydroxide, and hydrogen peroxide. 7265°—17 2 Technologic Papers of the Bureau of Standards - ???????? ——^M^M

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