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在18g/L的碱性硅酸钠溶液中,加入7.5gm的环保无毒植酸,研究它对镁合金氧化膜表面形貌、成分、颜色、厚度以及耐蚀性影响。加入植酸后,氧化膜孔的直径范围由1~5μm增加到1~8μm,但氧化膜表面单位面积孔的个数由0.05个/μm^2减少到0.02个/μm^2。植酸参与氧化膜的形成过程,并使氧化膜颜色随着植酸加入量的增加逐渐加深。植酸使氧化膜的厚度由11gm增加到16μm。浸泡实验表明,植酸可进一步提高氧化膜耐蚀性,产生第一个腐蚀点时间由24h延长到50h。 相似文献
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综述了电解质对氧化膜性能影响,为设计、选用阳极氧化工艺提供参考。随着人类环保意识的增强,未来镁合金阳极氧化电解质研究重点在于开发更多、对环境和人类友好且能较大提高氧化膜耐蚀性的物质。 相似文献
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TiO2 and N-doped TiO2 films were deposited on the glass substrates by arc ion plating method. The results show that the deposition rate does not change with the increasing deposition time. The increase of mass flow rate of N2 gives rise to the increase of deposition rate. All as-deposited TiO2 and N-doped TiO2 films are amorphous. The anatase TiO2 phase with preferred orientation (101) is acquired by post-annealing at 400 ℃ for 2 h. The incorporation of N into the TiO2 films and the heat treatment extensively shift the band edge to the visible light region. 相似文献
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The composite metastable (Ti0.5Al0.5)N, (Ti0.45Al0.45Cr0.1)N and (Ti0.35Al0.35Cr0.3)N coatings were respectively deposited on a wrought martensite steel 1Crl 1 Ni2W2MoV for aero-engine compressor blades by arc ion plating technique with pulse substrate bias. All the coatings have B1NaCl phase with a (200) preferred orientation and dense structures. The results show that the introduction of Cr into (Ti,Al)N gives rise to a minute shrinkage of crystal lattice. The incorporation of chromium into the coatings dramastically improves the oxidation-resistance of the coatings. For (Ti0.5Al0.5)N, a layered oxide scale forms after 100 h oxidation and the outer layer is the blend oxide of TiO2 and Al2O3, and the middle layer is rich in AI and the inner layer is rich in Ti. For (Ti0.45Al0.45Cr0.1)N, the oxide scale possesses a double-layered structure and the outer layer is rich in Ti. For (Ti0.35Al0.35Cr0.3)N, a Cr-rich compound oxide scale of Ti, AI and Cr forms, and a out-diffusion of Fe from steel to the nitride coating and oxide film during the oxidation takes place. 相似文献
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