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

说明：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博士与埃及赫尔万中央冶金研究与发展研究所（CMRDI） Adel Ismail博士之间的合作研究项目。pi将研究基于铈，钒酸盐，钼酸盐和高锰酸盐化合物的新表面处理，采用溶胶-凝胶法替代六价铬的工艺。六价铬是一种广泛使用的腐蚀屏障，也是一种已知的致癌物质。这些新处理提供的腐蚀保护将通过电化学阻抗谱和极化测试进行评估。粘合性能也将使用标准测试方法进行测量。一系列的样品将在不同的实验条件下制备，如凝胶速率，干燥温度，以及在应用处理化合物之前在不同的表面制备下。还将研究溶胶的粘度和转化成凝胶的时间。新涂层系统的防腐性能将在划痕和均匀涂层条件下进行研究。粘合性能也将被测量。使用盐雾室试验，将有希望的涂层系统的耐久性与基于色素的涂层系统在恶劣条件下进行比较。研究范围：研究成果对解决铝合金及复合材料防腐等工程问题具有重要影响。替代有毒的六价铬作为一种对铝合金进行防腐的方法在大量的应用中具有重要的意义。这一结果将导致无毒材料逐渐用于铝合金和铝复合材料的涂层。合作团队明确了各自的角色，而且两个团队都有使用溶胶的经验。这两个研究所有进行这项工作的必要设施。学生们应该参与到这个项目中来，并对与腐蚀、界面和加工技术相关的问题有所了解。该项目得到了美国-埃及联合基金项目的支持，该项目向两国的科学家和工程师提供赠款，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.