Tennyson Smith

Benzotriazole as Corrosion Inhibitor for Copper II. Acid NaCl Solutions

The effect of benzotriazole on the corrosion of copper in 3% NaCl at pH3 has been studied by immersion tests, potentiostatic polarization, a.c. impedance measurements and ellipsometric investigations. Results show that a thin layer of BTA forms in neutral solutions but that, in acidic solutions, the film is covered with a porous salt film which can be easily wiped off. Results seem to indicate that BTA interacts with the copper surface only when it is covered with some oxide. See also AATA 9-379. -- AATA

Effects of certain variables on the polarization capacity of zirconium

The polarization capacity of zirconium was measured, using the Wagner ballistic galvanometer method. The following variables were investigated- potential, electrolyte concentration, temperature, surface area, and surface treatment. The capacity of the potential minimum was 2.6 plus or minus 0.2 mu F/cm/sup 2/. Changes in capacity with time after etching or abrading were interpreted in terms of oxidefilm growth. (auth)