为优化工艺参数,提高镁合金的耐蚀性,利用正交试验法在无铬、无磷的环保型化学氧化液中对镁合金AZ31的化学氧化工艺进行了优化,得出最佳工艺参数:0.03 mol/L KMnO4、0.1mol/L Na2B4O710H20、氧化温度40℃、氧化时间5min.同时利用扫描电镜、x射线衍射和动电位极化等方法分析了优化参数下生成的氧化膜的表面形貌、厚度、组成和耐蚀性能.结果表明:镁合金AZ31在环保型化学氧化液中形成了一层厚约2~3μm、含有一定量MgAl2O4的保护性氧化膜,该氧化膜可以使镁合金AZ31在3%NaCl溶液中的腐蚀速度仅为镁合金的1/15,对镁合金起到了有效的保护作用.
参考文献
[1] | 刘静安.镁合金加工技术发展趋势与开发应用前景[J].轻合金加工技术,2001(11):1-7. |
[2] | 黄少东,唐全波,赵祖德,刘川林,曹洋,赵军.用镁合金促进兵器装备轻量化[J].金属成形工艺,2002(05):8-10. |
[3] | 张文毓.镁合金及其加工技术研究进展[J].稀有金属快报,2007(08):15-19. |
[4] | Amy L. Rudd;Carmel B. Breslin;Florian Mansfeld .The corrosion protection afforded by rare earth conversion coatings applied to magnesium[J].Corrosion Science,2000(2):275-288. |
[5] | Huo H W;Li Y;Wang F H .Corrosion of AZ91D magnesiam alloy with a chemical conversion coating and electroless nickel layer[J].Corrosion Science,2004,46(06):1467-1477. |
[6] | David Hawke;D. L. Albright .A Phosphate-Permanganate Conversion Coating for Magnesium[J].Metal finishing,1995(10):34,36-38-0. |
[7] | Umehara H.;Takaya M.;Terauchi S. .Chrome-free surface treatments for magnesium alloy[J].Surface & Coatings Technology,2003(0):666-669. |
[8] | Ming Zhao;Shusen Wu;Ping An;Jirong Luo .Influence of surface pretreatment on the chromium-free conversion coating of magnesium alloy[J].Materials Chemistry and Physics,2007(2/3):475-483. |
[9] | M.A. GONZALEZ-NUNEZ;C.A. NUNEZ-LOPEZ;P. SKELDON;G.E. THOMPSON;H. KARIMZADEH;P. LYON;T.E. WILKS .A NON-CHROMATE CONVERSION COATING FOR MAGNESIUM ALLOYS AND MAGNESIUM-BASED METAL MATRIX COMPOSITES[J].Corrosion Science,1995(11):1763-1772. |
[10] | Chong KZ.;Shih TS. .Conversion-coating treatment for magnesium alloys by a permanganate-phosphate solution[J].Materials Chemistry and Physics,2003(1):191-200. |
[11] | 周婉秋,单大勇,韩恩厚,柯伟.镁合金无铬化学转化膜的耐蚀性研究[J].材料保护,2002(02):12-14. |
[12] | 杨德钧;沈卓身.金属腐蚀学[M].北京:冶金工业出版社,1999:84-91. |
[13] | Li GY;Lian JS;Niu LY;Jiang ZH;Jiang Q .Growth of zinc phosphate coatings on AZ91D magnesium alloy[J].Surface & Coatings Technology,2006(3/4):1814-1820. |
[14] | BaUerini G;Bardi U;Bignucolo R et al.About some corrosion mechanisms of AZ91D magnesium alloy[J].Corrosion Science,2005,47(09):2173-2184. |
[15] | Mathieu S;Rapin C;Steinmetz J et al.A corrosion study of the main constituent phases of AZ91 magnesium alloys[J].Corrosion Science,2003,45(12):2741-2755. |
[16] | Hassan H E;Kazuhisa A;Hidetaka K.Improvement in startpate chemical conversion coating on AZ91D magnesiuln alloy using the potentiostatic technique[J].Electrochimica Acta,2007(53):1006-1012. |
[17] | Hongping Duan;Chuanwei Yan;Fuhui Wang .Effect of electrolyte additives on performance of plasma electrolytic oxidation films formed on magnesium alloy AZ91D[J].Electrochimica Acta,2007(11):3785-3793. |
[18] | Song G L;Atrens A;Wu X L et al.Corrosion behaviour of AZ21,AZ501 and AZ91 in sodium chloride[J].Corrosion Science,1998,40(10):1769-1791. |
[19] | F. Zucchi;A. Frignani;V. Grassi;G. Trabanelli;C. Monticelli .Stannate and permanganate conversion coatings on AZ31 magnesium alloy[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2007(12):4542-4552. |
[20] | Zhao M;Wu SS;An P;Luo JR;Fukuda Y;Nakae H .Microstructure and corrosion resistance of a chromium-free multi-elements complex coating on AZ91D magnesium alloy[J].Materials Chemistry and Physics,2006(1):54-60. |
[21] | V.Gabis;J.PIldefonse;B.Deppussay .Corrosion of MgO and MgAl_2O_4 by aluminium alloys[J].Key engineering materials,1997(3):1653-1656. |
[22] | Ma Y;Nie X;Northwood D O.Corrosion and erosion properties of silicate and phosphate coatings on magnesium[J].Thin Solid Films,2004(469-470):472-477. |
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%