为了获得性能优异的转化膜层,利用正交试验确定了组分为Ca(NO3)2、含Mn成膜剂、磷酸(85%)和加速剂的AZ91D镁合金多元复合转化处理液优化配方.用扫描电镜和X射线衍射仪分析了该配方所得转化膜的表面形貌和相结构.试验表明:转化膜表面分布着未穿透转化膜的裂纹,多元复合膜层由非晶态物质以及少量的Ca0.965Mg2Al16O27、Mn5.64P3、ZnAl2O4和(Mg0.66Al0.34)(Al0.83Mg0.17)2O4晶体构成.通过极化曲线分析转化膜在5%的NaCl溶液中的耐蚀性能,结果表明:多元转化膜具有比传统含Cr6+化合物的Dow1处理工艺所得转化膜优良的耐蚀性能.
参考文献
| [1] | 左铁镛.中国镁及镁合金发展战略[J].科学中国人,2006(02):28-29. |
| [2] | Geneviève B;Nadine P .The corrosion of pure magnesium in aerated and deaerated sodium sulphate solutions[J].Corrosion Science,2001,43(02):1 324-1 331. |
| [3] | M. Jaime Vasquez;G. P. Halada;C. R. Clayton .The application of synchrotron-based spectroscopic techniques to the study of chromate conversion coatings[J].Electrochimica Acta,2002(19):3105-3115. |
| [4] | M. A. Gonzalez-Nunez;P. Skeldon;G. E. Thompson;H. Karimzadeh .Kinetics of the development of a nonchromate conversion coating for magnesium alloys and magnesium-based metal matrix composites[J].Corrosion: The Journal of Science and Engineering,1999(12):1136-1143. |
| [5] | J.E. Gray;B. Luan .Protective coatings on magnesium and its alloys-a critical review[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2002(1/2):88-113. |
| [6] | 李瑛,余刚,刘跃龙,叶立元,郭小华.镁合金的表面处理及其发展趋势[J].表面技术,2003(02):1-5. |
| [7] | 王洁,丁毅,徐蔚,王玲玲.AZ31镁合金表面磷化工艺研究[J].表面技术,2006(02):55-56. |
| [8] | JIS K 5400-1900.Japanese industrial standard testing methods forpaints[S]. |
| [9] | Ambat R;Aung N N;Zhou W Q .Evaluation of microstructural effects on corrosion behaviour of AZ91D magnesium alloy[J].Corrosion Science,2000,42(08):1 433-1 455. |
| [10] | Ming Zhao;Shusen Wu;Ping An .Growth of multi-elements complex coating on AZ91D magnesium alloy through conversion treatment[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2007(1/2):310-315. |
| [11] | Inoue H;Sugahara K;Yamamoto A .Corrosion rate of magnesium and its alloys in buffered chloride solutions[J].Corrosion Science,2002,44(03):603-610. |
| [12] | 金华兰,危仁杰,杨湘杰.镁合金磷酸盐转化膜层生长过程及其腐蚀率[J].特种铸造及有色合金,2005(11):651-653. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%