مقاله انگلیسی رایگان در مورد رفتار خوردگی ماتریکس فلزی از جنس آلومنیم مسلح شده – الزویر 2017

Aluminium Metal Matrix composite plays a major role in fabricating corrosive and cryogenic environment application products like Moss- and SPB-type tanks (LNG carrier insulation systems), Arctic chemical processing equipments, pressure vessels, subsea pipelines, and drill pipes (offshore structures). An alternative material for corrosion and cryogenic environment with increased life span without affecting the properties was mainly focused by many researches. Aluminium alloy is one of the widely used matrix material due to its low density to weight ratio, high strength and corrosion resistance property. In addition, Aluminium alloys exhibit high ductility and strength at cryogenic environment than at normal temperature. ANMMC was introduced which has a wide range of applications in ships, offshore structures, LNG carrier, pressure vessel because of its high strength to weight ratio, specific stiffness and corrosion resistance [1–4]. Aluminium alloy AA5083 is selected as matrix material for many marine and low temperature applications [5–8]. By adding an appropriate reinforcement to ∗ Corresponding author. E-mail addresses: samuelrathish@live.com (P.S. Samuel Ratna Kumar), smart@karunya.edu (D.S. Robinson Smart), johnalexis@rediffmail.com (S. John Alexis). the AA5083, corrosion resistance of the material will be improved. In this regard, Nano particle can be added as reinforcement for metal matrix composite [9]. Based on the reference data there are three important reinforcing mechanisms to be considered before adding the nano particle as reinforcement in metal matrix composite to obtain a high strengthening effect; Orowan mechanism, thermal mismatch and load transfer are the mechanisms used for reinforcing the metal matrix. As the number of particles increases, interparticle spacing and smaller yield for smaller particles of reinforcement in a certain volume fraction is Orowan mechanism. In order to create higher dislocation density around the reinforcement’s thermal mismatch needs a high difference for the coefficient of thermal expansion, between the reinforcement and the matrix. The load can be transferred efficiently as much stronger and high aspect ratio of the reinforcement [9,10]. Based on the reinforcing mechanisms, Multiwall carbon nanotubes (MWCNTs) were selected as reinforcement material. Most of the researches show an effective usage of CNTs (carbon nanotubes) as reinforcement in Aluminium matrix with improved mechanical andcorrosionproperties.MWCNT wasmanufacturedusing twodifferent methods 1. Arc-discharge and 2. Chemical vapor deposition (CVD). CVD–MWCNT is the most used material for an industrial level and large quantities can be produced in a cheap cost compare to the Arc-discharge–MWCNT [11–16]. Compare to the matrix material MWCNT is in nano size, agglomeration of MWCNT was reported as common problem that restricts the achievement of the desired properties. When above 1 wt% of MWCNT were mixed with the matrix material there will be a formation of clusters in the processed composites, reduces the ductility, strength and stiffness [11,17,18]. The main challenge faced by Polymer, ceramic or metal matrix composites reinforced with CNT is uniform dispersion. The cluster formations of CNT are due to van der Walls forces and have an incredible surface area of up to 200 m2 g−1. The properties of a composite are related to the volume fraction or weight fraction ofthe reinforcement added along with the matrix material. Hence, uniform dispersion of CNT is important as it provides uniform change in the properties of the composite [18]. In this present work the corrosion behaviour of ANMMC has been studied with the reinforcement of MWCNT by different weight percentages which were not concentrated in the earlier works. In order to enhance the uniform dispersion of MWCNT reinforcement in the matrix material, compo-casting method was employed. Density and strength of the Aluminium Nano Metal Matrix Composite was also investigated.