研制了钼酸钠添加剂改进磷化膜及钼酸钠、硝酸铈、硅酸钠溶胶封闭后处理改进磷化复合膜,拟替代高毒性铬酸盐钝化膜.采用中性盐雾试验、Tafel极化和电化学阻抗测试对比分析了这4种改进磷化膜与几种传统无铬转化膜、铬酸盐钝化膜耐蚀性的差异;用SEM和EDS研究带划痕试样经盐雾腐蚀后划痕表面的组织形貌和化学成分,初步探讨了改进磷化复合膜的自修复性.结果表明:3种改进磷化复合膜的耐蚀性优于铬酸盐钝化膜,具有自修复作用,有望成为铬酸盐钝化膜的替代品;硅酸钠溶胶封闭后处理改进磷化复合膜的耐蚀性最优.
Several modified phosphate coatings obtained by molybdate additives, molybdate post-sealing, cerium nitrate post-sealing, or silicate sol post-sealing were developed to be as the replacers of high-toxic chromate passivation coatings. The corrosion resistance of four modified phosphate coatings, several chromium-free conversion coatings and chromate passivation coatings was compared using neutral salt spray (NSS) test, Tafel polarization and electrochemical impedance spectroscopy (EIS) measurements. The morphology and chemical compositions of the scratches on three samples with modified composite coatings after NSS test were analyzed using scanning electron microscopy (SEM) and energy dispersive spectroscopy(EDS). The self-healing performance of the modified composite coatings was discussed preliminarily. The results show that the corrosion resistance of three composite coatings is remarkably superior to that of chromate coatings; Three composite coatings are self-repairable and are the promising replacers of chromate passivation coatings; The anti-corrosion performance of the composite coatings post-sealing with silicate sol is optimal.
参考文献
| [1] | Akhtar AS;Susac D;Glaze P;Wong KC;Wong PC;Mitchell KAR .The effect of Ni2+ on zinc phosphating of 2024-T3 Al alloy[J].Surface & Coatings Technology,2004(2/3):208-215. |
| [2] | Jegannathan S;Narayanan TSNS;Ravichandran K;Rajeswari S .Formation of zinc-zinc phosphate composite coatings by cathodic electrochemical treatment[J].Surface & Coatings Technology,2006(12/13):4117-4126. |
| [3] | 张圣麟,李红玲,娄淑芳,孔小波.一种低温锌系磷化促进剂的动力学研究[J].表面技术,2006(06):40-42,81. |
| [4] | 江静华,李凌,胡建新,蒋建清,马爱斌.冷轧A3钢薄板的稀土复合锌系低温磷化[J].表面技术,2007(04):79-81,88. |
| [5] | LIN Bi-lan,LU Jin-tang,KONG Gang,LIU Jun.Growth and corrosion resistance of molybdate modified zinc phosphate conversion coatings on hot-dip galvanized steel[J].中国有色金属学会会刊（英文版）,2007(04):755-761. |
| [6] | Bi-Lan Lin;Jin-Tang Lu;Gang Kong .Effect of molybdate post-sealing on the corrosion resistance of zinc phosphate coatings on hot-dip galvanized steel[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2008(4):962-967. |
| [7] | Lin Bi-lan;Lu Jin-tang;Kong Gang .Composition and performance of the composite coatings obtained by phosphating and cerium nitrate post-sealing on galvanized steel[J].Journal of Rare Earths,2007,25(SI):461-464. |
| [8] | Lin BL;Lu JT;Kong G .Synergistic corrosion protection for galvanized steel by phosphating and sodium silicate post-sealing[J].Surface & Coatings Technology,2008(9):1831-1838. |
| [9] | 林碧兰,孔纲,卢锦堂,车淳山,刘军.热镀锌层上磷酸锌转化膜的生长与耐蚀性[J].中国有色金属学报,2007(05):800-806. |
| [10] | 刘军,卢锦堂,林碧兰,孔纲,车淳山.胶质磷酸钛表调预处理对热镀锌层表面磷化膜的影响[J].材料保护,2007(02):1-3. |
| [11] | Aramaki K .Inhibition effects of chromate-free,anion inhibitors on corrosion of zinc in aerated 0.5 M NaCl[J].Corrosion Science,2001,43(03):591-604. |
| [12] | Amirudin A;Thierry D .Corrosion mechanism of phosphated zinc layers on steel as substrates for automotive coatings[J].Progress in Organic Coatings,1996,28(01):59-76. |
| [13] | C. Cachet;F. Ganne;S. Joiret;G. Maurin;J. Petitjean;V. Vivier;R. Wiart .EIS investigation of zinc dissolution in aerated sulphate medium - Part II: zinc coatings[J].Electrochimica Acta,2002(21):3409-3422. |
| [14] | S. Jegannathan;T. S. N. Sankara Narayanan;K. Ravichandran;S. Rajeswari .Performance of zinc phosphate coatings obtained by cathodic electrochemical treatment in accelerated corrosion tests[J].Electrochimica Acta,2005(2):247-256. |
| [15] | Kouisni L;Azzi M;Dalard F;Maximovitch S .Phosphate coatings on magnesium alloy AM60 Part 2: Electrochemical behaviour in borate buffer solution[J].Surface & Coatings Technology,2005(2/3):239-246. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%