Abstract
Electroless Ni–P coating was deposited on W–Cu alloy via potential activation at −0·8 V. The coating was characterised for its morphology, structure, microhardness and the corrosion resistance. Scanning electron microscopy observation showed the presence of smooth and compact crystals in the coating. X-ray diffraction analysis showed that the Ni–P coating was amorphous in structure. The adhesion between Ni–P coating and W–Cu alloy was qualified. Heat treatment can improve the microhardness of Ni–P coating. Both the porosity test and immersion test in 10 vol.-% H2SO4 solution revealed that the Ni–P coating exhibited good corrosion resistance properties in protecting the W–Cu alloy.
Get full access to this article
View all access options for this article.
References
1.
Ryu
S. S.
,
Kim
Y. D.
and
Moon
I. H.
J. Alloys Compd , 2002 , 335 , 233 –240 .
2.
da Costa
F. A.
: Powder Technol , 2003 , 134 , 123 –132 .
3.
Shi
X.
,
Yang
H.
and
Wang
S.
Mater. Chem. Phys. , 2007 , 104 , 235 –239 .
4.
Hosng
S.-H.
and
Kim
B.-K.
Mater. Lett. , 2003 , 57 , 2761 –2767 .
5.
Kim
J.-C.
and
Moon
I.-H.
Nanostruct. Mater. , 1998 , 10 , 283 –290 .
6.
Lee
J. S.
and
Kim
T. H.
Nanostruct. Mater. , 1995 , 6 , 691 –694 .
7.
Shi
X. L.
,
Yang
H.
,
Shao
G. Q.
,
Duan
X. L.
and
Yan
L.
Mater. Set Eng. A , 2007 , A457 , 18 –23 .
8.
Peng
X. L.
: Mater. Set Eng. A , 1999 , A262 , 1 –8 .
9.
Raghu
T.
,
Sundaresan
R.
and
Ramakrishnan
P.
Mater. Set Eng. A , 2001 , A304-306 , 438 –441 .
10.
Gauthier
V.
,
Robaut
F.
and
Upadhyaya
A.
J. Alloys Compd , 2003 , 361 , 222 –226 .
11.
Liu
Z.
and
Gao
W.
Appl Surf Set , 2006 , 253 , 2988 –2991 .
12.
Li
L.
and
An
M.
J. Alloys Compd , 2008 , 461 , 85 –91 .
13.
Cao
C. N.
: ‘Principle of corrosion electrochemistry’ ; 2004 , Beijing , China, Chemistry Industry Press .
14.
Branciaroli
J. P.
and
Lindsay
J. H.
Plat. Surf Finish , 2001 ,88 , 12 –20 .
15.
Balaraju
J. N.
and
Rajam
K. S.
Surf Coat. Teehnol. , 2005 , 195 , 154 –161 .
16.
Shassi-Sorkhabi
H. A.
and
Rafizadeh
S. H.
Surf Coat. Technol. , 2004 , 176 , 318 –326 .
17.
Gawne
D. T.
and
Ma
U.
Mater. Sei. Teehnol. , 1987 , 3 , 228 –234 .
18.
Balaraju
J. N.
and
Rajam
K. S.
Surf Coat. Technol , 2005 , 195 , 154 –161 .