目的研究代替铬酸阳极氧化和稀铬酸氧化膜层封闭处理的工艺。方法在硼硫酸阳极氧化溶液中添加不同的稀土盐对铝合金进行阳极氧化，采用稀土盐对氧化膜层进行封闭处理，分析对比膜质量及膜层耐腐蚀性能。结果在硼硫酸阳极氧化溶液中加入稀土A盐能够提高氧化膜层的耐腐蚀性能，用稀土C盐溶液对该阳极氧化膜层进行封闭处理，可以进一步提高氧化膜层的耐腐蚀性能，耐中性盐雾腐蚀时间达到336 h。结论稀土A盐改进的硼硫酸阳极氧化/C盐封闭技术有望代替铬酸阳极氧化技术。
ABSTRACT:Objective To study the technology of anodic oxidation without chromate acid and sealing the oxidation film without dilute chromic acid. Methods The anodic oxidation film was prepared in the boron sulfuric acid anodic oxidation solution containing different rare earth salts, and then sealed in solutions containing rare earth salts. The film quality and corrosion resistance of the films were comparatively analyzed. Results Adding rare earth A salt into boron sulfuric acid anodic oxidation solution could improve the anti-corrosion property of the oxidation film, and sealing the as-prepared anodic oxidation film with rare earth C salt could fur-ther improve the anti-corrosion property of the oxidation film. This film could be intact after being placed for 336 h in NSS environ-ment. Conclusion The boron sulfuric acid anodic oxidation modified by rare earth A salt and sealed by rare earth C salt is expected to replace the chromic acid anodizing technology.
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