Abstract
Corrosion behaviour of nanocrystalline Zn–Ni alloy coatings (with 3 to 18 at-%Ni) electrodeposited on steel substrate from additive free chloride baths by DC plating has been investigated by measurement of open circuit potential with time and neutral salt spray test. The alloy coatings containing up to 16 at-%Ni exhibited an increase in resistance to the appearance of white and red rust with increasing Ni content. The resistance to the appearance of white rust and ability to protect the underlying steel substrate decreased with further increasing Ni content. This has been considered to be due to reduced passivating ability of the alloy coating with a significant rise in the grain size above 50 nm.
Get full access to this article
View all access options for this article.
References
1.
Alfantazi
M
Page
J
Erb
U
: J. Appl. Electrochem ., 1996 26 , 1225-1234.
2.
Youssef
KhMS
Koch
CC
Fedkiw
PS
: Corros. Sci. 2004 46 51 –64 .
3.
Hall
DE
: Plat. Surf. Finish ., 1983 70 59 –65 .
4.
Akiyama
T
Fukushima
H
: ISU Int ., 1992 32 787 –798 .
5.
Wilcox
GD
Gabe
Dr
: Corros. Sci ., 1993 35 , 1251-1258.
6.
Fratesi
R
Roventi
G
: Surf. Coat. Technol ., 1996 82 , 158 –164 .
7.
Mehmood
M
Zhang
B. -P
Akiyama
E
Habazaki
H
Kawashima
A
Asami
K
Hashimoto
K
: Corros. Sci. 1998 40 1 –17 .
8.
Mehmood
M
Akiyama
E
Habazaki
H
Kawashima
A
Asami
K
Hashimoto
K
: Corros. Sci. 1998 41 477 –499 .
9.
Mehmood
M
Akiyama
E
Habazaki
H
Kawashima
A
Asami
K
Hashimoto
K
: Corros. Sci. 1999 41 , 1871-1890.
10.
Mehmood
M
Akiyama
E
Habazaki
H
Kawashima
A
Asami
K
Hashimoto
K
: Corros. Sci. 2000 42 361 –382 .
11.
Afshari
V
Dehghanian
C
: Corros. Sci. 2009 51 , 1844-1849.
12.
Koch
C
Ovid'ko
IA
Seal
S
Veprek
S
: ‘Structural nanocrystalline materials fundamentals and applications’ 1st edn ; 2007 Cambridge Cambridge University Press .
13.
Rizwan
R
Mehmmod
M
Imran
M
Ahmad
J
Aslam
M
Akhter
JI
: Mater. Trans ., 2007 48 , 1558-1565.
14.
Cuilty
BD
: ‘Elements of X-ray diffraction’ 2nd edn ; 1978 Reading, MA Addison-Wesley Publishing Company, Inc .