Pitting corrosion of zirconium and hafnium

✍ Scribed by S. Hornkjøl

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 364 KB
• Volume: 33
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(88)80016-1

✦ Synopsis

The initiation and inhibition of pitting corrosion on zirconium and hafnium in aqueous solutions have been investigated by potentiodynamic, potentiostatic and galvanostatic measurements at 25°C. Effects of Cl-, Br-and I have been examined over a range of salt concentrations and pH. All three halide ionscause pitting attack on the two metals, but this may be inhibited by other anions. The results show that hafnium is more easily protected against pitting than is zirconium. The data are treated by the Butler-Volmer equation to yield more information about the mechanisms of the pitting corrosion.