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Synthesis and characterization of hybrid films obtained by sol-gel with addition of GPTMS and epoxy resin for aluminum adhesion

Grant number: 18/26447-5
Support type:Scholarships in Brazil - Master
Effective date (Start): November 01, 2019
Effective date (End): October 31, 2021
Field of knowledge:Engineering - Aerospace Engineering
Principal Investigator:Luciana de Simone Cividanes Coppio
Grantee:Amanda Alvarenga Coutinho Silva
Home Institution: Divisão de Ciências Fundamentais (IEF). Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil

Abstract

Aluminum alloy is one of the materials that is on the rise in the aerospace, space and automotive sectors, replacing the commonly used steels. It is common to use anodizing and chromatizing processes as surface treatment of these alloys, to improve their adhesion and protection against corrosion. However, they are imported processes with high toxicity. Among the most promising alternatives for replacing these processes are siloxane sol-gel systems. Thus, the objective of this work is the development of siloxane sol-gel films (tetraethoxysilane-TEOS and 3-glycidoxypropyl trimethoxysilane-GPTMS) and epoxy resin for adhesion of aluminum substrates. Five variables that may influence the metal-metal bonding efficiency will be evaluated using experimental design and with the aid of the test tape and shear tests: solvent type, curing agent type, amount of GPTMS, time after preparation of the film for application to the substrate and composition of adhesive layers deposited on the substrate. Further analysis, such as differential scanning calorimetry, infrared spectroscopy, viscosity testing and microscopy will provide support for better understanding of the results. The understanding of how each variable influences the physico-chemical properties of the films and their adhesion efficiency, as well as the correlation between the results, will be fundamental for an improvement of the synthesis and application processes of the sol-gel adhesives for the metal-metal bonding, replacing the currently used methods, which are imported and have high toxicity.