双相镁锂合金表面磷酸盐化学转化膜的制备及性能研究

Preparation and Properties of Phosphate Chemical Conversion Coatings on Dual Phase Mg-Li Alloys

以磷酸氢二铵、硝酸钙、十二烷基硫酸钠、磷酸组成磷酸盐转化液,采用正交实验法在不同浓度组成的转化液中分别制备镁锂合金磷酸盐化学转化膜,对比研究组分浓度对镁锂合金表面磷酸盐化学转化膜耐蚀性的影响。实验结果表明:合金在转化液组成配比为15 g·L^(-1) (NH_(4))_(2)HPO_(4)、35 g·L^(-1)Ca(NO_(3))_(2)·4H_(2)O、0.6 g·L^(-1) C_(12)H_(25)NaSO_(4)时形成的磷酸盐化学转化膜耐腐蚀性能最佳。

The phosphate conversion coatings of magnesium lithium alloys were prepared in the conversion solution composed of diammonium hydrogen phosphate,calcium nitrate,sodium dodecyl sulfate and phosphoric acid by orthogonal test.The effects of component concentrations on the corrosion resistance of phosphate conversion coatings on the surface of magnesium lithium alloys were studied.The experimental results showed that the chemical conversion coating exhibited the best corrosion resistance when the composition ratio of conversion solution was 15 g·L^(-1)(NH_(4))_(2)HPO_(4),35 g·L^(-1) Ca(NO_(3))_(2)·4H_(2)O and 0.6 g·L^(-1) C_(12)H_(25)NaSO_(4).