. Transactions. Fig. 62. Fig. 63. Fig. 62.—Electrolytic irox, XH3, 700° C. 14 hr. Etched with nitricACID. X 220. Fig. 63.—Same as Fig. 62, etched with Steads reagent. solution was made up as follows: Cupric chloride, 0 gm.; magnesiumchloride, 20 gm.; hydrochloric acid, 10 , alcohol (95 per cent.) tomake up to 500 Absolute alcohol gave less satisfactory results. The photomicrographs, Figs. 60 to 63, 66 and 67, of ammonia-treatedelectrolytic iron, etched with nitric acid and Steads, respectively, show IX ^^:^A -\l ./ Fig. 64. Fig. 60. Fig. 64.—Electric weld etched with nitric 6
. Transactions. Fig. 62. Fig. 63. Fig. 62.—Electrolytic irox, XH3, 700° C. 14 hr. Etched with nitricACID. X 220. Fig. 63.—Same as Fig. 62, etched with Steads reagent. solution was made up as follows: Cupric chloride, 0 gm.; magnesiumchloride, 20 gm.; hydrochloric acid, 10 , alcohol (95 per cent.) tomake up to 500 Absolute alcohol gave less satisfactory results. The photomicrographs, Figs. 60 to 63, 66 and 67, of ammonia-treatedelectrolytic iron, etched with nitric acid and Steads, respectively, show IX ^^:^A -\l ./ Fig. 64. Fig. 60. Fig. 64.—Electric weld etched with nitric 65.—Same as Fig. 64, etched with Steads reagent. characteristic structures. With HNO3 etching, the nitrides areas areusually edged with a hard white cementite-like constituent, which alsoforms part of the interior area. When etched with Steads, this wliiteconstituent is eaten out, giving the deep black appearance shown inFigs. 61 and 63. Cementite areas remain entirel} unaffected, and true DISCUSSION 309
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