. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . Fig. 4.—Corroded Muntz metal sheathing (a) Before attack; the light-colored /3 matrix fills in between the a crystals. (6) After 7 years exposure to sea water (see Fig. 1, c) the /3 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 1 _ w

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