Abstract

Cyclic voltammetry, electrochemical measurements at constant potential, and metallography were used to follow the anodic activity of chill-cast and wrought pure Pb and ternary PbCaSn alloys as well as cast and wrought PbSb. Cyclic voltammetry showed the formation of irreversible PbO 2 during a 1000 cycle test and also brought to light a diffusion or barrier-limited process during the cathodic discharge of calcium-containing alloys. Constant potential measurements could be correlated with corrosion behavior. The relative anodic activity was ranked for all samples tested. In general, chill-cast material showed less anodic activity than wrought materials, and ternary alloys less than pure lead, although in some cases the difference was very small. Die anodische Aktivität von kalt geformten und bearbeiteten reinem Blei und ternärer Blei—Kalzium—Zinn Verbindung wurde mit Hilfe von zyklischer Voltammetrie, elektrochemischen Messungen bei konstantem Potential, und Metallograph untersucht. Die zyklische Voltammetrie zeigte eine irreversibel Formation von PbO 2 während 1000 Zyklen. Ein Vorgang, der von Diffusion oder einem anderen Zeit-beschränkten Vorgang herrührt, wurde für kathodische Entladung der Kalzium-enthaltenden Verbindungen festgestellt. Die relative anodische Aktivität von allen Proben zeigte, dass kalt-geformte Materialen im allgemeinen weniger korrodierten als bearbeitete Metalle, und ternäre Verbindungen weniger als reines Blei. In manchen Fffllen war aber dieser Unterschied klein.

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