. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . OF PARTS WHILE UNDER STRESS Type 4 (Table 1) is particularly instructive in suggesting serviceconditions which may aid in this type of corrosion. Fig. 8 showsthe face of the bolthead which was fractured as shown in Fig. head detached itself apparently spontaneously in service,suggesting in this respect the season cracking of brass. Dezinc-ification of the surface metal in the outer marginal area, x — x,occurred and penetrated to a depth of from to mm; thecentral area shows no corrosive a
. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . OF PARTS WHILE UNDER STRESS Type 4 (Table 1) is particularly instructive in suggesting serviceconditions which may aid in this type of corrosion. Fig. 8 showsthe face of the bolthead which was fractured as shown in Fig. head detached itself apparently spontaneously in service,suggesting in this respect the season cracking of brass. Dezinc-ification of the surface metal in the outer marginal area, x — x,occurred and penetrated to a depth of from to mm; thecentral area shows no corrosive attack, the fracture here havingthe appearance of a direct tension break. The most severe attackwas near the apex of the right angle beneath the head. The easiestand most logical explanation is that the failure in this case is oneof corrosion under The starting point perhaps may have 2 For description of such cases of corrosion of brass under stress, see E. Jonson, Proc. Am. Soc. Test 101,1915; and P. D. Merica, B. S. Tech. Paper No. 83. Deterioration of Muntz Metal ii. ptv # ^&g££§^%ll .> ;•?.;•?-•^-„. - . //^>
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