. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . ertainconditions, although the method of attack as revealed by themicrostructure is different. 5. The line of demarcation between attacked and unattackedportions is very sharply defined. The action is not a gradual one,but the change is an abrupt and complete one even within theindividual P crystals. 6. One of the most important conditions favorable to this typeof corrosion, which occurs commonly while the metal is immersedin sea water, is the accelerating effect of the closely adheringdeposits of basic
. Typical cases of the deterioration of muntz metal (60:40 brass) by selective corrosion. . ertainconditions, although the method of attack as revealed by themicrostructure is different. 5. The line of demarcation between attacked and unattackedportions is very sharply defined. The action is not a gradual one,but the change is an abrupt and complete one even within theindividual P crystals. 6. One of the most important conditions favorable to this typeof corrosion, which occurs commonly while the metal is immersedin sea water, is the accelerating effect of the closely adheringdeposits of basic zinc chloride resulting from the attack of themetal. Other influences which may accelerate the rate of attack 28 Technologic Papers of the Bureau of Standards are contact with substances more electronegative than either thea or p constituents, an increase of temperature, and the effect ofstresses to which the material may be subjected while in Thorough annealing of Muntz metal does not entirely pre-vent the selective corrosion of the jS constituent. Washington, June 4,
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