The Kinetics of Phosphate Film Formation on the Type MA 21 Magnesium
Lithium Alloys
L. A. Isaicheva, N. M. Trepak, L. K. Il’ina, and A. L. L’vov
Saratov State University, ul. Universitetskaya 42, Saratov, 410601 Russia
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Received June 8, 2005
Abstract — Kinetics of phosphating MA 21 magnesium–lithium alloys in a zinc–nitrate–phosphate solution (0.25
Zn2+ + 0.34 
+ 0.17 
N
+ 0.02 
F
, pH = 2.7) at 25°C is studied with various surface preparation procedures. The effect of the alloy surface pretreatment in titanium-containing activating solutions on the electrochemical process rate and the initial stage of the phosphate film crystallization is revealed. Peculiarities of the phosphate film growth during different stages of the magnesium–lithium alloy phosphating are elu-cidated. Combining the activating pretreatment with zinc–phosphate bath allows accelerated applying finegrain thin phosphate conversion layers with enhanced protective effect on magnesium–lithium alloys.
Zn2+ + 0.34 + 0.17 N + 0.02 F, pH = 2.7) at 25°C is studied with various surface preparation procedures. The effect of the alloy surface pretreatment in titanium-containing activating solutions on the electrochemical process rate and the initial stage of the phosphate film crystallization is revealed. Peculiarities of the phosphate film growth during different stages of the magnesium–lithium alloy phosphating are elu-cidated. Combining the activating pretreatment with zinc–phosphate bath allows accelerated applying finegrain thin phosphate conversion layers with enhanced protective effect on magnesium–lithium alloys.
PACS numbers: 81.65.Rv
DOI: 10.1134/S0033173206040138