Restricted accessResearch articleFirst published online 1991-1
Corrosion of aluminium alloy AIMg4 in NaCl solutions containing disodium salt of ethylenediaminetetracetic acid at various concentrations and pH values
The behaviour of the aluminim alloy AlMg4 (ASTM classification AA5086) in aqueous 3%NaCI solutions containing different quantities of the disodium salt of ethylenediaminetetracetic acid (EDT ADS) at various pH values was studied using gravimetric and electrochemical techniques (potential–time and polarisation curves, impedance spectrograms). It was observed that EDTADS had no effect on the AA5086 corrosion at pH 5·5, whereas it accelerated the attack at pH 7·5 and 9·5. The corrosion rate atthese two last values increased with the EDTADS concentration. A better agreement between gravimetric and impedance data than between gravimetric and polarisation data was found.
DonohueJ. M. and WoodsG. A.: Mater. Prot., 1968, 7, (2), 15–18.
7.
BellW. E.: Mater. Prot., 1965, 4, (2), 78–82.
8.
FrenierW. W.: Corrosion, 1984, 40, (4), 176–180.
9.
RegazzoniA. E. and MatijevicE.: Corrosion, 1984, 40, (4), 257–261.
10.
FrenierW. W. and KennedyW.C.: Corrosio, 1986, 42, (10), 613–622.
11.
‘Recommended practice for preparing, cleaning and evaluating corrosion test specimens’, G1–67, ASTM, Philadelphia, PA, 1967.
12.
BonnelA., DabosiF., DESLOUISC., DUPRATM., KEDDAMM., and TRIBOLLETB.: J. Electrochem. Soc., 1983, 130, (4), 753–761.
13.
MollicaA. and WrublC.: Atti della Scuola-Convegno sull'Impedenza Elettrochimica’ Rapporto Tecnico CNR-ICMM RT/8/1988, CNR-Area Della Ricerca di Padova, Italy, 1991.
