Materials World Network, SusChEM: Hybrid Sol-Gel Route to Chromate-free Anticorrosive Coatings

技术概要：用Cr（VI）进行表面处理是钝化金属的常见工业实践。 然而，Cr（VI）是一种已知的致癌物质。 用新的不含铬酸盐的防腐蚀涂层取代含Cr（VI）的涂层是公共卫生的优先事项。 本研究探讨了掺杂和未掺杂的混合有机-无机玻璃的形成，这是通过巩固“熔融凝胶”。 熔融凝胶具有疏水性、无孔性和不透气性，密封温度低（135至200摄氏度），可直接应用于金属和其他基材上。 研究重点是限制气体渗透性并保护金属表面的熔融凝胶的结构和化学方面。 一种感兴趣的基材是镁，因为其低密度、高强度、良好的导热性和导电性以及低弹性模量，使得具有改进的腐蚀保护的镁合金在汽车、航空航天和生物医学应用中特别令人感兴趣。 在材料研究部的支持下，这个材料世界网络，可持续化学，工程项目建立在美国PI Andrei Jitianu（纽约莱曼学院城市大学）和丽莎克莱因（罗格斯大学）与西班牙Mario Aparicio（陶瓷和维德里奥研究所，科学研究委员会上级）之间的密切合作之上。 非技术总结：传统的金属防腐涂层含有Cr（IV），这是一种已知会导致癌症的有毒物质。 为了用更安全的替代品取代这种有害材料，该项目将制备和研究一类含有腐蚀抑制剂的混合有机-无机“熔融凝胶”。 熔融凝胶是通过需要低温处理的简单工艺获得的无孔屏障。 它们通过其对金属的粘附性以及其阻止气体和水蒸气通过涂层的传输的能力来防止金属的环境降解。 我们的材料世界网络由3个合作伙伴组成，即雷曼学院的化学系、罗格斯大学的材料科学工程系以及西班牙马德里的陶瓷和玻璃研究所（CSIC）。 通过将三个实验室的专业知识与溶胶-凝胶处理和电化学测试的经验相结合，该团队将完成对镁合金和钢的腐蚀防护涂层形成机制的全面研究，这些涂层通常用于航空航天，汽车和生物相容性医疗植入物应用。通过这项研究计划，将分享在防腐和密封屏障应用中使用熔融凝胶的更多理解和实用知识。 同时，该计划将通过国际多学科方法教育学生化学，材料科学和腐蚀的相关主题。 计划进行科学家和学生的交流，以更全面地研究防腐蚀涂料。 来自代表性不足群体的学生的机会将包括在联邦承认的西班牙裔少数民族服务机构雷曼学院-纽约市立大学的参与中。

TECHNICAL SUMMARY:Surface treatments with Cr(VI) are a common industrial practice for passivating metals. However, Cr(VI) is a known carcinogen. Replacement of Cr (VI)-containing coatings with new chromate-free anticorrosive coatings is a public health priority. This research investigates the formation of doped and undoped hybrid organic-inorganic glasses, which are obtained by consolidating "melting gels". Melting gels are hydrophobic, nonporous and gas impermeable with low sealing temperatures (between 135 and 200 degrees centigrade), and they can be applied directly onto metals and other substrates. The research focuses on the structural and chemical aspects of melting gels that limit gas permeability and impart protection to metal surfaces. One substrate of interest is magnesium, because of its low density, high strength, good thermal and electrical conductivity, and low elastic modulus, making magnesium alloys with improved corrosion protection particularly interesting in auto, aerospace and biomedical applications. With support from the Division of Materials Research, this Materials World Network, Sustainable Chemistry, Engineering project is built on a strong collaboration between the PIs Andrei Jitianu (Lehman College City University of New York) and Lisa Klein (Rutgers University) from US and Mario Aparicio (Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas (CSIC)) from Spain. NON-TECHNICAL SUMMARY:Traditional anti-corrosion coatings for metals contain Cr(IV), a toxic material known to cause cancer. In an effort to replace this harmful material with a safer alternative, the project will prepare and study a use class of hybrid organic-inorganic "melting gels" that contain corrosion inhibitors. Melting gels are non-porous barriers obtained by a simple process that requires low temperature processing. They prevent environmental degradation of metals through their adherence to metals and their ability to hinder the transport of gases and water vapor through the coatings. Our Materials World Network consists of 3 partners, the Chemistry Department at Lehman College, the Materials Science & Engineering Department at Rutgers University, and the Institute for Ceramics and Glass (CSIC) in Madrid, Spain. By combining the expertise of three laboratories with experience in sol-gel processing and electrochemical testing, the team will complete a comprehensive study on the mechanisms for forming corrosion protection coatings for magnesium alloys and steels, which are used commonly for aerospace, automotive, and biocompatible medical implant applications. Through this research program, greater understanding and practical know-how in the use of melting gels for anticorrosive and hermetic barrier applications will be shared. At the same time, this program will educate students in relevant topics of chemistry, materials science and corrosion through an international multidisciplinary approach. Exchanges of scientists and students are planned to make a more comprehensive study of anticorrosive coatings. Opportunities for students from underrepresented groups will be included by the participation of Lehman College-CUNY, a federally recognized Hispanic minority serving institution.