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00211 EFFECTS OF ENVIRONMENTAL, ELECTROCHEMICAL, AND METALLURGICAL VARIABLES ON THE PASSIVE AND LOCALIZED DISSOLUTION OF TI GRADE 7

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Product Number: 51300-00211-SG
ISBN: 00211 2000 CP
Author: C.S. Brossia and G.A. Cragnolino
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The effects of chloride concentration, fluoride concentration, pH, temperature, and weldments on the corrosion behavior of Ti Grade 7 (UNS R52400) were examined. It was noted that even at elevated temperatures (165 °C), the breakdown and repassivation potentials in chloride solutions were well above 1 Vsc z. It was also observed that welded specimens exhibited lower breakdown and repassivation potentials than wrought specimens. Short-term tests examining the passive dissolution rate of Ti Grade 7 revealed that chloride concentration, pH, and applied potential had only a slight effect on passive dissolution rates. Fluoride additions to chloride solutions resulted in the appearance of a pseudo active/passive transition and a significant increase in the potential-independent current density, that was several orders of magnitude greater than typical passive current densities. Also of note was the observation that despite the use of creviced specimens, all corrosion attack took place on the boldly exposed surfaces of the specimens. A possible model to explain this observation is presented. Keywords: titanium, titanium palladium alloys, localized corrosion, weldments
The effects of chloride concentration, fluoride concentration, pH, temperature, and weldments on the corrosion behavior of Ti Grade 7 (UNS R52400) were examined. It was noted that even at elevated temperatures (165 °C), the breakdown and repassivation potentials in chloride solutions were well above 1 Vsc z. It was also observed that welded specimens exhibited lower breakdown and repassivation potentials than wrought specimens. Short-term tests examining the passive dissolution rate of Ti Grade 7 revealed that chloride concentration, pH, and applied potential had only a slight effect on passive dissolution rates. Fluoride additions to chloride solutions resulted in the appearance of a pseudo active/passive transition and a significant increase in the potential-independent current density, that was several orders of magnitude greater than typical passive current densities. Also of note was the observation that despite the use of creviced specimens, all corrosion attack took place on the boldly exposed surfaces of the specimens. A possible model to explain this observation is presented. Keywords: titanium, titanium palladium alloys, localized corrosion, weldments
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