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Passivation and pitting corrosion of α‐brass (Cu/Zn: 63/37) in neutral buffer solutions containing chloride ions
Author(s) -
ElRahman H. A. Abd
Publication year - 1990
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19900411106
Subject(s) - passivation , chloride , pitting corrosion , corrosion , passivity , inorganic chemistry , ion , electrochemistry , brass , chemistry , materials science , metal , phosphate , metallurgy , layer (electronics) , copper , electrode , composite material , organic chemistry , electrical engineering , engineering
The passivation behaviour and pitting corrosion of a commercial grade α‐brass (Cu/Zn:63/37) in neutral buffer solutions (borate and phosphate) in the presence and absence of chloride ions were investigated by electrochemical techniques. The results indicated the dezincification in absence of chloride ions at highly enough anodic potentials and both dezincification and pitting corrosion in the presence of chloride ions. The pitting susceptibility was found to depend on the composition of the buffer solution, chloride ion concentration and nature of the passive layer on the metal surface before pitting. Current transients corresponding to passivity, dezincification and pitting corrosion were identified and analyzed.