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42 5 () Vol.42 No.5
2011 5 Journal of Central South University (Science and Technology) May 2011
ZM6
( 410083)
ZM6 (SEM)
(EDS)X (XRD)
Sn2+ ZM6 1 h
Ni-P 8.74 µm9.29% 3.5% NaCl
−0.609 V1/10
ZM6
TG178 A 1672−7207(2011)05−1248−06
Pretreatment process and corrosion resistance of
electroless nickel plating on ZM6 magnesium alloy
GAO Yan-rui, LIU Chu-ming, FU Sheng-li, LI Hui-zhong, SHU Xin, GAO Yong-hao
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract: Nickel coating was prepared on ZM6 magnesium alloy by electroless nickel plating in nickel carbonate bath
with pretreatment of zinc immersion. The morphology and composition of zinc coating and electroless nickel coating
were studied by scanning electronic microscopy (SEM) and energy dispersive spectroscopy (EDS). The structure of
nickel coating was studied by X-ray diffraction spectroscopy (XRD). Potentiodynamic polarization analysis was used to
study the corrosion resistance of the coating. The results indicate that a compact, well-distributed zinc coating is obtained
on the surface of ZM6 alloy in a new zinc immersion solution with addition of Sn2+. The subsequent amorphous
electroless nickel coating is uniform and the thickness is 8.74 µm after 1 h deposition. Phosphorus mass fraction is 9.29%.
The corrosion potential is −0.609 V, and the corrosion current density is about 1/10 of substrate in 3.5% NaCl solution.
Key words: ZM6 magnesium alloy; zinc immersion; electroless nickel plating; corrosion resistance
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