Polarographic Study of Corrosion Phenomena

The Polarographic Observations on Percarbonic Acids and Percarbonates.

“…The polarograms were taken by means of the Sargent photographic polarograph Model XII and by means of a manual polarograph assembled from standard physical-chemical equipment. Various types of cells were used, including the Heyrovskj' cells and those specially designed for our experiments (18). All supporting electrolytes were "polarographically" pure, i.e., they did not exhibit, in the absence of dissolved oxygen, any reduction wave before their own final reduction currents.…”

“…A number of buffers prepared according to Kolthoff and Laitinen (10) were used to study the influence of pH on the newly observed wave. In a number of cases both the oxygen and the carbon dioxide concentrations of the solutions studied were determined analytically by means of the Winkler method for oxygen and by means of a specially designed barium hydroxide titration device for carbon dioxide (18).…”

“…In order to suppress the sharp maximum of the first oxygen wave a number of surface-active substances were used, such as methyl red, thymol, etc. (18). In the presence of sodium fluoride used as supporting electrolyte the oxygen peak does not appear and the new wave can be studied in the absence of any maximum 1 Paper presented before the Division of Physical and Inorganic Chemistry at the 115th Meeting of the American Chemical Society, which was held in San Francisco, California, March 27 to April 1, 1949. 2 Present address: Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana.…”

Corrosion Research in the Navy

“…The decomposition potential is cliaracteristic of the substance and the height of the curve is a measure of its concentration. The first current break is It was established that percarbonates can form during the reduction of oxygen in the presence of carbon dioxide, 16 and on the basis of these studies the investigation of the consumption of oxygen, carbon dioxide and their mixtures by various metals and alloys was undertaken. The technique was to expose the metal in a salt solution containing known amounts of carbon dioxide or oxygen or both and by t h q u s e of the polarograph to determine the rate of disappearance of these gases.…”

Research on Treated Magnesium Surfaces

“…Polarography (48)(49)(50)(51)(52)(53)(54)(55)(56)(57)(58)(59)(60) Methods have been developed for the measurement of minute quantities of dissolved metal salts in solution; or determination of the change in concentration of a corrosive constituent as it reacts with the metal and is removed from solution. For example, the concentration of the aluminum, zinc, and magnesium may be determined in a given electrolyte after immersion of the specimens for a given time.…”