轻合金锆/钛基转化膜的设计及性能研究

Design and Performance of Zr-and/or Ti-based Chemical Conversion Coatings for Light Alloys

通过对传统锆/钛基转化膜成膜机理的分析,提出了提升锆/钛基转化膜性能的设计理念,并分别在5083铝合金和AZ91D镁合金上进行了实践,显著提升了合金基体的耐腐蚀性能及其与有机涂层的附着性能。通过解析影响锆/钛基转化膜性能的关键因素,指出了当前锆/钛基转化膜研究的不足及其未来的发展方向。

Zr-and/or Ti-based chemical conversion coating(ZrTiCC) is an important and representative chromium-free surface modification technology for Al-alloys and Mg-alloys. ZrTiCC has reached the maturity of final commercial utilization in industry. The design concept to improve the performance of ZrTiCC was proposed based on the deposition mechanism analysis of conventional ZrTiCC in this paper.Moreover, the design concept was applied on the 5083 Al-alloy and AZ91D Mg-alloy. The results indicated that both the corrosion resistance of the coated substrates and the adhesion property with organic coating were significantly improved. Finally, the key factors affecting the performance of ZrTiCC were analyzed and the future development trend was expected.