. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . l ofthis kind which was submitted to this Bureau for examination. 1. WROUGHT BOLTS The Muntz-metal bolt illustrated in Figs. 1 and 2 was takenfrom the keel of a seagoing lifeboat after six years service. Thesample shown is illustrative of the condition of all the bolts used inthis particular case to attach the keel to the keelson. To thecasual observer the broken bolt appears to consist of a brasscenter with a heavy deposit of porous copper covering it. Thelocation of that part of the bolt which was mos
. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . l ofthis kind which was submitted to this Bureau for examination. 1. WROUGHT BOLTS The Muntz-metal bolt illustrated in Figs. 1 and 2 was takenfrom the keel of a seagoing lifeboat after six years service. Thesample shown is illustrative of the condition of all the bolts used inthis particular case to attach the keel to the keelson. To thecasual observer the broken bolt appears to consist of a brasscenter with a heavy deposit of porous copper covering it. Thelocation of that part of the bolt which was most severely attackedand its relation to the position within the keelson is of interest andis suggestive of one of the possible contributing causes to thistype of corrosion. This is shown in Fig. 3. 1 See, for instance, Second and Third Reports of the Corrosion Committee of the Institute of Metals, , of Metals, 1913, X, and 1916, XV, respectively; J. O. Arnold, Engineer, 85, p. 363, 1898; and Miltonand Larke, Proc. Inst. Civ. Engr., 154, p. 138, 1903. Deterioration of Muntz Metal.
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