Requisitos e restrições da utilização de fluidos de corte na usinagem de liga de alumínio 7075 quanto a propagação de corrosão intergranular

Abstract

This research presents an approach to the development of intergranular corrosion in aluminum alloy 7075, comparing the influence of cutting fluid on the decrease in fatigue resistance motivated by its use in aircraft structural components. At first, it is presented what this type of corrosion is and how it develops in the rystalline structure, observing which variables combine with the worsening of this problem and its impacts on the microstructure, observing the decrease in structural resistance through fatigue analysis, which stands out even more due to the circumstances that will be presented during the description of the research. The carrying out of tests in the laboratory will seek to evaluate the reactions of the material when exposed for some time to the cutting fluid and to analyze and compare the development of corrosion in the microstructure, with this objective analysis of the loss of mechanical resistance in the samples under variables many other, in addition to the comparisons made in the decrease of resistance motivated by the variation of the manufacturing geometry. The results obtained indicated the difference that the amine present in the cutting fluid b rings i n t he d evelopment o f intergranular corrosion and consequently in the fatigue process, even if in a small proportion, the effects of the propagation of intergranular corrosion in the aluminum alloy studied and the influence on the reduction in the mechanical resistance of the alloy.