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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 14 (1963), S. 11-14 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Inhibiting the corrosion of copper and bronze in ammonium chloride solutions by colloidsInspired by tests carried out by F. D. Talati, M. N. Desai and A. M. Trivedi, the author has carried out solubility tests with pure copper and with bronzes Ms 60 and Ms 70 in 0.1 n-NH4Cl with and without inhibitor content (the latter consisting of the colloids agar and/or gelatine). In the solution free from inhibitor, copper shows the highest corrosion rate, and Ms 60 has a clearly higher rate than Ms 70. As a result of admixtures of agar or gelatine, the copper corrosion caused by the NH4Cl solution is greatly reduced, whilst on the other hand, admixtures consisting of agar and gelatine greatly activate the corrosion attack. Moreover, whilst both types of bronze are protected against NH4Cl corrosion by agar or gelatine admixtures to roughly the same extent, a different proportion of both agar and gelatine added together will result in an inhibition effect which differs in principle, and which may be either positive or negative.
    Notes: Angeregt durch Versuche von F. D. Talati, M.N. Desai and A. M. Trivedi wurden mit Reinkupfer und den Messingen Ms 60 und Ms 70 Löslichkeitsversuche in inhibitorfreier und in inhibitorhaltiger (Zusätze der Kolloide Agar oder/und Gelatine) O, 1n-NH4Cl durchgeführt. In der inhibitorfreien Lösung wird Kupfer am Stärksten angegriffen. Messing Ms 60 wird deutlich stärker angegriffen als Ms 70. Agar- oder Gelatine-Zusätze setzen den Angriff der NH4Cl-Lösung auf Kupfer stark herab, während Agar- und Gelatine-Zusätze den Angriff stark aktivieren. Während weiter beide Messing-Sorten durch Agar- Oder Gelatine-Zusätze etwa in dem gleichen Ausmaße vor dem Angriff der NH4Cl-Lösung geschützt werden, ergibt der unterschiedlich hohe Zusatz der Inhibitorgemische (Agar und Gelatine) grundsätzlich unterschiedliche Hemmstoff-Wirkungen, und zwar positive oder negative Hemmstoff effekte.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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