TY - GEN
T1 - Electrochemical evaluation of Zn-22 wt.% Al- x wt.% Ag (x = 2, 4, 6) sacrificial anodes
AU - Hernandez-Alvarado, L. A.
AU - Hernandez, L. S.
AU - Arce, E. M.
AU - Cabrera-Sierra, R.
PY - 2008
Y1 - 2008
N2 - The object of the present work was to determine the possibility that Zn-Al eutectoid alloys (Zn-22 wt.% Al), with silver contents of 2, 4 and 6 wt.%, could be used as sacrificial anodes for cathodic protection of steel structures in two test aqueous solutions: substitute ocean water and 0.5 M NaCl. Besides the as-cast condition, some samples were homogenized at 350°C during 96 h and air-cooled. A short-term electrochemical test, DNV RP B401, as well as electrochemical impedance spectroscopy were performed to obtain electrochemical behavior and electrochemical capacity of the anodes, and to reveal any tendencies to passivation. The experimental results suggest that the Zn-Al-Ag sacrificial anodes, with both microstructures, showed a passive behavior in substitute ocean water. However, these alloys exhibited adequate potentials and electrochemical capacities to work as sacrificial anodes in 0.5 M NaCl.
AB - The object of the present work was to determine the possibility that Zn-Al eutectoid alloys (Zn-22 wt.% Al), with silver contents of 2, 4 and 6 wt.%, could be used as sacrificial anodes for cathodic protection of steel structures in two test aqueous solutions: substitute ocean water and 0.5 M NaCl. Besides the as-cast condition, some samples were homogenized at 350°C during 96 h and air-cooled. A short-term electrochemical test, DNV RP B401, as well as electrochemical impedance spectroscopy were performed to obtain electrochemical behavior and electrochemical capacity of the anodes, and to reveal any tendencies to passivation. The experimental results suggest that the Zn-Al-Ag sacrificial anodes, with both microstructures, showed a passive behavior in substitute ocean water. However, these alloys exhibited adequate potentials and electrochemical capacities to work as sacrificial anodes in 0.5 M NaCl.
UR - http://www.scopus.com/inward/record.url?scp=70449652338&partnerID=8YFLogxK
U2 - 10.1149/1.3046639
DO - 10.1149/1.3046639
M3 - Contribución a la conferencia
AN - SCOPUS:70449652338
SN - 9781615672882
T3 - ECS Transactions
SP - 251
EP - 258
BT - ECS Transactions - MES 23
PB - Electrochemical Society Inc.
T2 - MES 23: Electrochemistry, Nanotechnology, and Biomaterials - 23rd MES Meeting
Y2 - 1 June 2008 through 6 June 2008
ER -