Hot-dip galvanizing (HDG) is typically used to protect steel wire rope from a corrosive environment by dipping steel wire in molten Zn-based alloy. The resistance towards corrosion however lies in the amount of Mg presence in Zn-based alloys. In this work, HDG is carried out by varying the addition of Mg in the Zn-5Al bath with various dipping times. Electrochemical impedance spectroscopy (EIS) measurement was carried out from 1 MHz to 1Hz at amplitude of 10 mV to evaluate the barrier properties of the coating. The Tafel analysis was conducted within the range of -0.25V to 0.25V in determining the electrochemical reaction of coated steel in accelerated corrosion media of 3.5% NaCl. It was found that, coated layer with 3wt.% Mg in Zn-5Al exhibited the highest resistance towards corrosion of 4.09×10−6 mpy.

1.
A.
Angel
,
S.
Predrag
,
G.
Mile
,
M.
Jovan
, and
R.
Macedonia
, ‘
Zn-CRYSTAL GROWTH ONTO CONTINUOUS HOT DIP GALVANIZED STEEL
’, pp.
368
374
,
2003
.
2.
A.
Amadeh
,
B.
Pahlevani
, and
S.
Heshmati-Manesh
, ‘
Effects of rare earth metal addition on surface morphology and corrosion resistance of hot-dipped zinc coatings
’,
Corros. Sci.
, vol.
44
, no.
10
, pp.
2321
2331
,
2002
, doi: .
3.
H. qiang
Fan
,
W. can
Xu
,
L.
Wei
,
Z. hong
Zhang
,
Y. bao
Liu
, and
Q.
Li
, ‘
Relationship between La and Ce additions on microstructure and corrosion resistance of hot-dip galvanized steel
’,
J. Iron Steel Res. Int.
, vol.
27
, no.
9
, pp.
1108
1116
,
2020
, doi: .
4.
B.
Zhang
, ‘
Development of corrosion resistant galvanising alloys
’,
2005
.
5.
H.
Robert
, ‘Chapter 6: Corrosion control’, in
Metallurgy and Corrosion Control in Oil and Gas Production
, 2nd ed.,
John Wiley & Sons, Incorporated
,
2018
, pp.
159
232
.
6.
D. Z.
Alvarez
, ‘
Mechanisms and kinetics of the galvannealing reactions on Ti IF steels
’,
2014
.
7.
A.
Khezrloo
,
F.
Rezazadeh
,
M.
Rajaee
,
M.
Tayebi
,
E.
Aghaie
, and
Y.
Behnamian
, ‘
Effect of coating parameters on microstructure, corrosion behavior, hardness and formability of hot-dip Galfan and galvanized coatings
’,
Int. J. Mater. Res.
, vol.
112
, no.
4
, pp.
321
332
,
2021
.
8.
N.
Heshmati
, ‘
Effect of cast iron surface treatment on interfacial adhesion of Al / Fe compound cast structure
’,
2020
.
9.
J.
Meng
,
W.
Sun
,
Z.
Tian
,
X.
Qiu
, and
D.
Zhang
,
Corrosion performance of magnesium (Mg) alloys containing rare-earth (RE) elements
.
Woodhead Publishing Limited
,
2013
.
10.
C.
Yao
,
H.
Lv
,
T.
Zhu
,
W.
Zheng
, and
X.
Yuan
, ‘
Effect of Mg content on microstructure and corrosion behavior of hot dipped Zn e Al e Mg coatings
’,
J. Alloys Compd.
, vol.
670
, pp.
239
248
,
2016
, doi: .
11.
Y.
Xie
,
A.
Du
,
X.
Zhao
,
R.
Ma
,
Y.
Fan
, and
X.
Cao
, ‘
Surface & Coatings Technology E ff ect of Mg on Fe – Al interface structure of hot – dip galvanized Zn – Al – Mg alloy coatings
’,
Surf. Coatings Technol.
, vol.
337
, no.
29
, pp.
313
320
,
2018
, doi: .
12.
P. K.
Rai
,
D.
Rout
,
D. S.
Kumar
,
S.
Sharma
, and
G.
Balachandran
, ‘
Effect of Magnesium on Corrosion Behavior of Hot-Dip Zn-Al-Mg Coating
’,
J. Mater. Eng. Perform.
, no. Ref 16,
2021
, doi: .
13.
A. N. C.
Costa
,
G. C.
Silva
,
E. A.
Ferreira
, and
R. Z.
Nakazato
, ‘
Comparative analysis of corrosion resistance of Zinc and Zn-Al-Mg coatings on carbon steel
’,
Res. Soc. Dev.
, vol.
10
, no.
1
, p.
e49810111973
,
2021
, doi: .
This content is only available via PDF.
You do not currently have access to this content.