. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . a. d FlG. 12.—Illustration of various conditions affecting ~ification (a-b) Samples of Muntz metal which were in contact with copper while immerse., n sodium chloridesolution. In a the wire was inserted in the central hole; in b it was wrapped abound the attack is immediately adjacent to the copper wire. ( X 2). (c) Muntz metal sample which has been immersed in 5 per cent sodium chloride solution. The dark spots are corroded areas which formed beneath adhering deposits of basic zinc ch
. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . a. d FlG. 12.—Illustration of various conditions affecting ~ification (a-b) Samples of Muntz metal which were in contact with copper while immerse., n sodium chloridesolution. In a the wire was inserted in the central hole; in b it was wrapped abound the attack is immediately adjacent to the copper wire. ( X 2). (c) Muntz metal sample which has been immersed in 5 per cent sodium chloride solution. The dark spots are corroded areas which formed beneath adhering deposits of basic zinc chloride. (X2.)unetched. (d) Cross section of one of the spots shown in c. (X500.) Etching, ammonium hydroxide and hydrogen peroxide. The dark band is the basic zinc chloride deposit which accelerated the attack of the metalbeneath. A copper layer, shown in the upper two corners, was deposited in the sample to protectthe edge of the specimen during the polishing. Deterioration of Muntz Metal 21
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