US-Egypt Cooperative Research: New Sol-Gel Prepared Anti-Corrosion Thin Films for Aluminum Alloys and Composites

该奖项旨在支持佛罗里达大学盖恩斯维尔分校材料科学与工程系Darryl Butt博士和埃及赫尔万中央冶金研究开发研究所(CMRDI)Adel Ismail博士之间的合作研究项目。PIS将研究以溶胶-凝胶法应用的基于铈、钒、钼酸盐和高锰酸盐化合物的新的表面处理方法，以取代涉及六价铬的工艺。六价铬是一种广泛使用的防腐层，是一种已知的致癌物。将使用电化学阻抗谱和极化测试来评估这些新处理所提供的腐蚀保护。粘合性能也将使用标准测试方法进行测量。在使用处理化合物之前，在不同的实验条件下，如凝胶化速度、干燥温度以及不同的表面处理方法，将制备一系列的试件。此外，还将研究溶胶的粘度和将溶胶转变为凝胶的时间。在划痕和均匀涂层条件下，考察新涂层体系的防腐性能。还将测量粘合性能。通过盐雾室试验，将有前景的涂层系统与铬酸盐涂层系统在恶劣条件下的耐久性进行比较。范围：该研究成果可以对解决铝合金和复合材料免受腐蚀的工程问题产生重大影响。取代有毒的六价铬作为铝合金防腐的一种方法，在大量的应用中具有重要意义。这一结果将导致无毒材料作为铝合金和铝合金复合材料涂层的逐步使用。合作团队对角色有明确的识别，两组都有使用溶胶-凝胶的经验。这两个研究所拥有开展这项工作的必要设施。预计学生将参与该项目，并将对与腐蚀、界面和加工技术相关的问题有所了解。该项目得到了美国-埃及联合基金计划的支持，该计划为两国的科学家和工程师提供资助，以开展这些合作活动。

0318141ButtDescription: This award is to support a cooperative research project between Dr. Darryl Butt, Department of Materials Science and Engineering, University of Florida, Gainesville, Florida and Dr. Adel Ismail, Central Metallurgical Research and Development Institute (CMRDI), Helwan, Egypt. The PIs will study new surface treatments based on cerium, vanadate, molybdate and permanganate compounds applied by sol-gel method as replacement of processes involving hexavalent chromium. Hexavalent chromium is a widely used corrosion barrier that is a known carcinogen. The corrosion protection provided by these new treatments will be evaluated using electrochemical impedance spectroscopy and polarization tests. The adhesion performance will be also measured using standard test methods. A series of specimens will be prepared under different experimental conditions such as rate of gelation, drying temperature and also, under different surface preparation prior to applying the treatment compounds. The viscosity and the time to convert sol into gel will be also investigated. The corrosion protection performance of the new coatings systems will be investigated under scratched and uniform coatings conditions. The adhesion performance will be also measured. The durability of the promising coating systems will be compared with a chromate-based coating system under severe conditions using the salt spray chamber test.Scope: The research results can have a significant impact in solving an engineering problem, that of protecting aluminum alloys and composites from corrosion. Replacement of toxic hexavalent chromium as a method of corrosion protection of Al alloys is of great importance in a very large number of applications. The results will lead to the gradual use of non-toxic materials as coatings for Al alloys and Al composites. There is clear identification of roles by the collaborating teams and both groups have experience with sol gels. The two institutes have the necessary facilities for this work. Students are expected to participate in the project and will develop an understanding for problems related to corrosion, interfaces, and processing techniques. This project is being supported under the US-Egypt Joint Fund Program, which provides grants to scientists and engineers in both countries to carry out these cooperative activities.