. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . point of intimate contact(Fig. 12a and b.) The attack is not general over the entire surfaceof the brass sample. No dezincification of the brass occurred inthe case of the brass-iron couple. Although intimate coat actwith the proper substances will induce and accelerate the corrosiveattack of brass, in none of the types previously described canthis condition be assigned as the principal cause of the attack. 3. ACCELERATING EFFECT OF THE PRODUCTS OF CORROSION The accelerating effect of deposits of basic


. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . point of intimate contact(Fig. 12a and b.) The attack is not general over the entire surfaceof the brass sample. No dezincification of the brass occurred inthe case of the brass-iron couple. Although intimate coat actwith the proper substances will induce and accelerate the corrosiveattack of brass, in none of the types previously described canthis condition be assigned as the principal cause of the attack. 3. ACCELERATING EFFECT OF THE PRODUCTS OF CORROSION The accelerating effect of deposits of basic zinc chloride formedon the surface of the corroded specimen by the corrosion of thebrass, upon the further attack of the metal has been known forsome time and has been previously The exact way inwhich this acceleration occurs, however, is not clear, as basic zinc-chloride deposits have been described by some as 7 C. H. Desch, Physical and Mechanical Factors in Corrosion, Jour. Faraday Soc: 1915. (See, also,footnote 1.) 20 Technologic Papers of the Bureau of Standards.


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