Thermochemistry oxidation of trimetallic alloy modified bythermal procedure

In the present paper, the evolution of an oxidation process has been associated to the collective atomic arrangement, the microstructure one. This microstructural analysis encompasses a metallographic examination and a relation of electricity to chemical changes in salt-water solution. The electrochemical experimental techniques used include corrosion potential measurements. To seek a deeper understanding of microstructure evolution throughout secondary manufacturing process, a natural and artificial ageing at 5, 24, 100 and 200 h has been used. The objective of this paper is expressed on correlated the dependence of the oxidative surface degradation with the microstructure development by the thermal aged condition. The performance of the expected optimum conditions was estimated considering the microstructural inspection and analytical studies using scanning electron microscopy and EDX. The thermochemistryoxidative degradation has a different behavior in each conditionelectrochemical test, that has been related with the microstructure, mostly occurring related to namely primary solid solution aluminium rich (Al), eutectic (+), and precipitates. Eutectic phase showed influence on oxidative degradation behavior more significantly in artificial ageing thermal treatment. Alloys artificially aged with small eutectic size and fine precipitates offered marginally lower corrosion rate and better passivation compared with the higher time ageing condition. The EDX spectrum in interdendritic region before and after corrosion test revealed the removal of eutectic from alloy during corrosion. The corrosion behavior of the AlMg alloy modified with zinc is influenced by the microstructure, phase type and quantity of phases.