Corrosion Behavior of an Artificially Aged (T6) Al–Si–Mg-based Metal Matrix Composite

Abstract

The influence of age hardening on the corrosion behavior of Al-Si-Mg-based metal matrix composites (MMCs) has been investigated in aerated and deaerated 3.5 wt% aqueous NaCl solutions. Silicon carbide particle (SiC p ) reinforced composites consisting of 10 and 20 vol% SiC p s are produced by the compocasting technique. After the extrusion process, the composites are artificially aged (T6). The corrosion resistances of the aged composites are analyzed by measuring the cyclic potentiodynamic polarization. The surface morphology of the composites before and after the corrosion tests are determined by using metallographic methods and scanning electron microscopy (SEM). In addition, the X-ray diffraction technique (XRD) has been used to determine the phases that occur at the matrix-reinforcement interface. The results demonstrate that the E pit values of unreinforced matrix alloy and composites increase negatively with increasing aging time. It is also observed that corrosion preferentially starts at the interface of Al-Mg 2 Si and Al-SiC p .

Prediction of corrosion susceptibilities of Al-based metal matrix composites reinforced with SiC particles using artificial neural network

“…The details of the production and experimental methods are given in the previous study. 15 The proposed ANN model for the prediction of corrosion susceptibilities of the composites is formed by using the software MATLAB program (version 7.9.0.529, R2009b). The number of hidden layers and the number of neurons within these layers are optimized through the training process.…”

“…15,16 An ANN was used in order to predict the occurrence of general or localized corrosion, using potentiodynamic polarization scans. The initial data inputs such as E corr , E pit , and I corr were calculated from polarization scans for a number of different compositions, and these were used for the predictions.…”

“…Nowadays, age hardening (T6) has been used widely to increase the strength of aluminium alloys. Several corrosion studies 15,16,21 indicated that this treatment may greatly affect the corrosion behavior of MMCs. The effects of the oxygen content of the electrolyte on the corrosion behavior of the Al-based MMCs are not well understood, the parameter plays a role on the alloy's pitting potential response and difficult the measurement and quality of the polarization data.…”

Structural evolution of mechanically alloyed Al–12Si/TiB2/h-BN composite powder coating by atmospheric plasma spraying

“…exhibit high strength, stiffness and superior wear resistance, therefore these composites have received considerable interest and wide range of applications in automotive, aerospace and transport industries [1][2][3][4]. Among these reinforcements titanium diboride (TiB 2 ) is an advanced ceramic material with relatively high strength and durability as characterized by high melting point, hardness, strength to density ratio, and wear resistance [5][6][7][8].…”

Investigation of Ageing Parameters on Properties of AL/ALBITE MMCs

“…The higher nucleation vacancy promotes the creation of Guinier-Preston (GP) zone such as Al-Mg-Si and Mg-Al alloy. [6] Transmission electron microscopy (TEM) studies have proved the existence of dislocation due to heterogeneous nucleation which leads to increase the strength of the Al MMCs [7]. Many research work showed that precipitation reaction in some Al MMCs in both theoretical and experimentally and they suggested that only matrix dislocation enhances the precipitation growth [8].…”