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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2015

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Corrosion behaviour of aluminium matrix composites reinforced with sintered halloysite nanotubes

Dobrzański L. A., Reimann Ł., Kujawa M., Tomiczek B.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 73, nr 2

92--99

Purpose: The aim of this study was to determine the effect of mass fraction and sintering temperature of the halloysite nanotubes on the corrosion behavior of the infiltrated AlSi12 matrix composites, concerning the matrix alloy. Design/methodology/approach: The corrosion resistance research was done with a potentiodynamic method. Electrochemical corrosion research was made in water centre of 3% NaCl at room temperature. Electrochemical studies of corrosion resistance were performed by determine the open circuit potential and saving the anodic polarization curves by applying to potential changes in the direction of anode and cathode at 1 mV/s. Based on the registered anodic polarization curves were determined: corrosion potential, passive layer breakdown potential, corrosion current density, polarization resistance. The value of corrosion current was determined using the Tafel extrapolation. Findings: Mass fraction of the halloysite nanotubes does not affect the corrosion resistance of the composites as opposed to their sintering temperature. The increase in temperature of a 200°C resulted in a significant reduction in corrosion resistance, but it is still higher than the corrosion of the matrix material. Practical implications: The aluminium alloy matrix composites reinforced with sintered preforms made by sintering halloysite nanotubes are modern materials that could find application in the automotive industry. The mechanical properties are greater than the alloy matrix while retaining a low density. It was necessary to examine the corrosion resistance as one of the important properties of the composites which are exposed to corrosive environments. Originality/value: Beyond the articles of the authors, analysis of mechanical properties and corrosion resistance of the infiltrated AlSi12 matrix composites reinforced by preform made by sintered halloysite were not found in the available literature.