On the role of mass transport in high rate dissolution of iron and nickel in ECM electrolytes—I. Chloride solutions

✍ Scribed by Madhav Datta; Dieter Landolt

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 648 KB
• Volume: 25
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(80)87130-1

✦ Synopsis

High rate anodic dissolution of iron and nickel in 5 M NaCl was studied in a flow channel cell under controlled hydrodynamic conditions . Galvanostatic experiments were aimed at investigating the influence of current density and electrolyte flow rate on anode potential, current efficiency for metal dissolution and surface texture resulting from dissolution . Active dissolution at low current densities leads to surface etching and transpassive dissolution at high current densities leads to surface brightening . Transition from active to transpassive dissolution is mass transport controlled and is accompanied by a change in anode potential, surface microtexture and in case of iron by a change in the valence of metal dissolution .