Ｆｅ－Ｗ非晶镀层经铬酸盐钝化处理，可获得具有装饰效果的含Ｃｒ钝化膜。经测定，孔蚀电位较钝化前正移１．６８Ｖ，明显改善了抗ＣＩ－腐蚀的能力。ＡＥＳ与ＸＰＳ的分析结果表明：钝化膜由内外两层构成，外层为Ｆｅ（ＣｒＯ４）３·Ｃｒ２（ＣｒＯ４）３／Ｃｒ２（Ｃｒ２Ｏ７）３·Ｆｅ（ＯＨ）３／ＦｅＯＯＨ·ＷＯ３·ｎＨ２Ｏ等化合物，内层由Ｃｒ２Ｏ３，ＣｒＯ３，ＣｒＯＯＨ，ＦｅＯ，Ｆｅ２Ｏ３及ＷＯ３组成。钝化膜厚度约为６０ｎｍ。该双层饨化膜有效地阻止了Ｃｌ－对基体金属的腐蚀。
A decorative passive film containing Cr was obtained by passiVating Fe-W amorphous deposits in a chromate solution. Anodic polarization curves showed that the pitting potential of the passivated Fe-W deposit was high up to 1.78V in 3wt% NaCl solution at 25℃ and that the passiVation treatment improved its corrosion resistance against Cl- attack. The results of AES and XPS analyses revealed that the passive film consisted of two layers. The outer layer was a mixturof Fe(CrO4 ) 3· Cr2 (CrO4 ) 3· Cr2 (Cr2 O7) 3·Fe (OH) 3 /FeOOH· WO3·nH2O and t he inner layer was a mixture of Cr2O3,CrO3 , CrOOH, FeO, Fe2O3and WO3. The thickness of the passive film was about 60nm.
参考文献
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| [2] | 小见崇等．(日)金属表面技术,1973,24:6122渡边彻．(日)金属表面技术,1987,38:2103姚素薇,赵水林,郭鹤桐等．中国腐蚀与防护学报,1993,13(4):3504姚素薇,郭鹤桐,王存等．材料保护,1992,25(5):95姚素薇,赵水林,任丽彬等．应用化学,1995 |
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