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| Effects of Concentration of Sodium Borate on Anodizing for Magnesium Alloy |
| Jiangang Qian;Di Li;Xueli Wang;Baolan Guo |
| 北京航空航天大学材料科学与工程学院 |
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Abstract The anodizing of AZ91D Mg alloy in the solution of
different concentration of Na2B4O7 has been investigated by ways of voltag
e-time curve,immersion corrosion experiment,polarization curve,XRD,SEM,EDS and X
PS respectively.The results show that the film-forming course can be divided int
o three stages:formation of dense layer before sparking,formation of porous laye
r accompanied with a bit of small sparking,and porous layer stable growth along
with bigger sparking.With increasing concentration of Na2B4O7 in the solut
ion of the anodizing,the time and voltage of sparking formation increase,the ape
rture and thickness of anodic oxide film become bigger.The anodic oxidation film
contains Mg2+,O2-,Si4+ and B3+,which is composed mainly
of MgO,MgSiO3 and Mg3B2O6.The concentration of Na2B4O7 plays great effect on corrosion resistance of the said film.The film has best corrosion resistance when the concentration of Na2B4O7 in the anodic solution is 160 g/L.
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Received: 25 May 2004
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Corresponding Authors:
Jiangang Qian
E-mail: qianjg@buaa.edu.cn
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