Zinc ribbon has been widely used for alternating current (ac) mitigation of pipeline. However, little is known about corrosion of zinc under ac. In this work, the corrosions of zinc under various ac in two scenarios, i.e. with or without direct current (dc) decoupler, were investigated in 4 g L− 1 Na2SO4 simulated backfill solution by weight loss tests, low angle X-ray diffraction measurements and electrochemical measurements. It was found that ac accelerated corrosion of zinc dramatically in both scenarios, and it is worth noting that dc density between zinc and pipeline steel increased with ac in the scenario without dc decoupler. Consequently, corrosion rate of zinc was much larger than that in the scenario in which dc decoupler was used. Besides, the charge transfer resistance of zinc decreased considerably due to ac in both scenarios, which would largely increase corrosion rate.
MicuD. D.ChristoforidisG. C. and CzumbilL.: ‘AC interference on pipelines due to double circuit power lines: a detailed study’Electr. Power Syst. Res., 20131031–8.
2.
TangD. Z.DuY. X.LuM. X.ChenS. S.JiangZ. T. and DongL.: ‘Study on location of reference electrode for measurement of induced alternating current voltage on pipeline’Int. Trans. Electr. Energy Syst., 20152599–119.
3.
TangD. Z.DuY. X.LuM. X.DongL. and JiangZ. T.: ‘Progress in the mutual effects between AC interference and the cathodic protection of buried pipelines’J. Chin. Soc. Corros. Prot., 201333351–356.
4.
ChristoforidisG. C.LabridisD. P. and DokopoulosP. S.: ‘Inductive interference calculation on imperfect coated pipelines due to nearby faulted parallel transmission lines’Electr. Power Syst. Res., 201366139–148.
5.
BiaseL. D.FumeiO. and CignaR.: ‘AC corrosion and cathodic protection of buried pipelines’. Proc. Conf. Corrosion 2010, Houston, TX, USA, March 2010, NACE International Paper 10108..
6.
QiL.YuanH.WuY. and CuiX.: ‘Calculation of overvoltage on nearby underground metal pipeline due to the lightning strike on UHV AC transmission line tower’Electr. Power Syst. Res., 20139454–63.
7.
FuA. Q. and ChengY. F.: ‘Effects of alternating current on corrosion of a coated pipeline steel in a chloride-containing carbonate/bicarbonate solution’Corros. Sci., 201052612–619.
8.
KuangD. and ChengY. F.: ‘Understand the AC induced pitting corrosion on pipelines in both high pH and neutral pH carbonate/bicarbonate solutions’Corros. Sci., 201485304–310.
9.
SoutheyR. D.RuanW. and DawalibiF. P.: ‘AC mitigation requirements: A parametric analysis’. Proc. Conf. Corrosion 2001, Houston, TX, USA, March 2001, NACE International Paper 604..
10.
SoutheyR. D.DawalibiF. P. and VukonichW.: ‘Recent advances in the mitigation of AC voltages occurring in pipelines located close to electric transmission lines’IEEE Trans. Power Delivery199491090–1097.
11.
DabkowskiJ.: ‘Methodologies for AC mitigation’. Proc. Conf. Corrosion 2003, San Diego, CA, USA, March 2003, NACE International Paper 703..
12.
FloydR.: ‘Testing and mitigation of AC corrosion on 8’ line: a field study’. Proc. Conf. Corrosion 2004, New Orleans, LA, USA, March 2004, NACE International Paper 210..
13.
GoidanichS.LazzariL. and OrmelleseM.: ‘AC corrosion. Part 2: parameters influencing corrosion rate’Corros. Sci., 201052916–922.
14.
BüchlerM.: ‘Alternating current corrosion of cathodically protected pipelines: Discussion of the involved processes and their consequences on the critical interference values’Mater. Corros., 2012631181–1187.
15.
XuL. Y.SuX.YinZ. X.TangY. H. and ChengY. F.: ‘Development of a real-time AC/DC data acquisition technique for studies of AC corrosion of pipelines’Corros. Sci., 201261215–223.
16.
XuL. Y.SuX. and ChengY. F.: ‘Effect of alternating current on cathodic protection on pipelines’Corros. Sci., 201366263–268.
17.
TangD. Z.DuY. X.LuM. X.JiangZ. T.DongL. and WangJ. J.: ‘Effect of AC current on corrosion behavior of cathodically protected Q235 steel’Mater. Corros., to be published.
18.
TangD. Z.DuY. X.LuM. X.JiangZ. T. and DongL.: ‘Study on CP criteria for mild steel in the presence of AC interference’. Proc. Conf. CORROSION 2014, San Antonio, TX, USA, March 2014, NACE International Paper 3802..
19.
JiangZ. T.DuY. X.DongL. and LuM. X.: ‘Effect of AC current on corrosion potential of Q235 steel’Acta Metall. Sin., 201147997–1002.
20.
Abd El AalE. E.: ‘On the pitting corrosion current of zinc by chloride anions’Corros. Sci., 20044637–49.
21.
Abd El AalE. E.: ‘Measurements of pitting corrosion currents of zinc in near neutral media’Corros. Sci., 2002442041–2053.
22.
Abd El AalE. E.: ‘Limits determination of toleration of aggressive anions by a certain passivator on zinc surface’Corros. Sci., 20085047–54.
23.
Abd El AalE. E.: ‘Factors affecting the anodic behaviour of zinc electrode in borate solutions’Corros. Sci., 200648343–360.
24.
ProsekT.ThierryD.TaxénC. and MaixnerJ.: ‘Effect of cations on corrosion of zinc and carbon steel covered with chloride deposits under atmospheric conditions’Corros. Sci., 2007492676–2693.
25.
ChenZ. Y.PerssonD. and LeygrafC.: ‘Initial NaCl-particle induced atmospheric corrosion of zinc – effect of CO2 and SO2’Corros. Sci., 200850111–123.
26.
VelichenkoA. B.SarretM. and MüllerC.: ‘Nature of the passive film formed at a zinc anode in zinc–nickel containing solutions’J. Electroanal. Chem., 1998481–3.
27.
AminM. A.: ‘Passivity and passivity breakdown of a zinc electrode in aerated neutral sodium nitrate solutions’Electrochim. Acta2005501265–1274.
28.
ThomasS.ColeI. S.SridharM. and BirbilisN.: ‘Revisiting zinc passivation in alkaline solutions’Electrochim. Acta201397192–201.
29.
Abd El AalE. E.: ‘Oxide film formation on zinc in borate solutions under open circuit’Corros. Sci., 20085041–46.
30.
YooJ. D.OgleK. and VolovitchP.: ‘The effect of synthetic zinc corrosion products on corrosion of electrogalvanized steel. I: cathodic reactivity under zinc corrosion products’Corros. Sci., 20148111–20.
31.
YooJ. D.OgleK. and VolovitchP.: ‘The effect of synthetic zinc corrosion products on corrosion of electrogalvanized steel. II: zinc reactivity and galvanic coupling zinc/steel in presence of zinc corrosion products’Corros. Sci., 20148332–37.
32.
WuL. K.HuJ. M. and ZhangJ. Q.: ‘Electrode position of zinc-doped silane films for corrosion protection of mild steels’Corros. Sci., 201259348–351.
33.
ASTM G1-03: ‘Standard practice for preparing, cleaning, and evaluating corrosion test specimens’; 2011West Conshohocken, PAASTM International.
34.
IbrahimI.TakenoutiH. and TribolletB.: ‘Harmonic analysis study of the AC corrosion of buried pipelines under cathodic protection’. Proc. Conf. Corrosion 2007, Houston, TX, USA, March 2007, Paper 07042..
35.
BüchlerM. and SchöneichH. G.: ‘Investigation of alternating current corrosion of cathodically protected pipelines: development of a detection, method, mitigation measures, and a model for the mechanism’Corrosion200965578–586.
36.
BrennaA.LazzariL. and OrmelleseM.: ‘A proposal of AC corrosion mechanism of carbon steel in cathodic protection condition’. Proc. Conf. Corrosion 2013, Orlando, FL, USA, March 2013, Paper 2457..
37.
LalvaniS. B. and LinX. A.: ‘A theoretical approach for predicting AC-induced corrosion’Corros. Sci., 1994361039–1046.
38.
LalvaniS. B. and LinX.: ‘A revised model for predicting corrosion of materials induced by alternating voltages’Corros. Sci., 1996381709–1719.
39.
BertocciU.: ‘AC induced corrosion – the effect of an alternating voltage on electrodes under charge-transfer control’Corrosion197935211–215.
40.
BoschR. W. and BogaertsW. F.: ‘A theoretical study of AC-induced corrosion considering diffusion phenomena’Corros. Sci., 199840323–336.
