Vol.:(0123456789) 1 3 Journal of Bio- and Tribo-Corrosion (2018) 4:62 https://doi.org/10.1007/s40735-018-0182-8 Corrosion Behaviour of Al 7075/Al 2 O 3 /SiC MMNCs by Weight Loss Method S. Suresh 1  · G. Harinath Gowd 2  · M. L. S. Devakumar 1 Received: 23 May 2018 / Revised: 18 August 2018 / Accepted: 27 August 2018 © Springer Nature Switzerland AG 2018 Abstract Aluminium-based metal matrix nanocomposites (MMNCs) are a variety of brand-new designed items. They serve a broad range of applications in the automobile, aerospace, biotechnology, electronic and defence markets. MMNCs are included in non-aluminium matrices such as nano-Al 2 O 3 (20–30 nm), Nano-SiC (50 nm), etc., which provide benefcial architectural features for base metal (AL) alloys. These include improved dimensional stability, creep resistance, abrasion resistance, and also excellent heat capacity. The present paper is a study on the corrosion characteristics of a MMNC and an unreinforced alloy (Al 7075). MMNCs have been used with nano-silicon carbide (SiC) and nano-aluminium oxide (Al 2 O 3 ). The Al 7075 series alloy is used to develop a composite with diferent portions of SiC (1.0, 2.0, 3.0, and 4.0%), and a hybrid composite with an equivalent quantity of Al 2 O 3 and SiC has been prepared by a liquid phase technique using a stir-casting method. In the present work, the weight-loss approach has been carried out by immersing the sample for 96 h in various corrosion media, such as sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl), and 3.5% sodium chloride (Nacl). The results recommend that hybrid demonstrates extra resistance to corrosion. Keywords Al 7075 · Al 2 O 3  · SiC · Corrosion rate 1 Introduction Lightweight aluminium composites are employed for many engineering applications because of their exceptional com- bination of properties such as thermal conductivity, excel- lent corrosion resistance, high toughness to volume propor- tion, and high elasticity. Abdul-Jameel et al. [1] revealed the evaluation of the corrosion rate of an Al6061/zircon metal matrix composite in sea water. Aluminium 7075 alloys are usually utilised in fabricating aircraft as well as automobile parts due to their high strength to volume ratio so as to produce lightweight components that conserve energy consumption. Al-Baaji et al. [2] carried out a test on the corrosion behaviour of an aluminium alloy matrix reinforced with alumina nanocomposite products in an association of two or more metals. Nunes et al. [3] studied the corrosion behaviour of alumina–aluminum and silicon carbide (SiC)–aluminum metal matrix composites. A metal matrix nanocomposite (MMNC) contains two elements, a metal matrix and a non-metallic or reinforcement material. Bienas et al. [4] revealed the corrosion characteristics of an aluminium matrix composite reinforced with SiC particles. During the manufacturing of the nanocomposite, the rein- forcement and the matrix metal are combined. Liu et al. [5] studied the corrosion behaviour of an Al/AlN p composite in an alkaline solution. SiC has been used as reinforcement particles in the shape of fbers, particulates, and whiskers to enhance the commercial properties of composites [6]. The present study includes research work on the corrosion behav- iour of Al 7075 matrix metal enhanced by nano-Al 2 O 3 and nano-SiC [7, 8]. MMNCs are generated by using an electric stir-casting technique [9, 10]. Pitting deterioration tests have been carried out to determine the corrosion resistance of Al 2 O 3 and SiC nano-reinforced Al 7075 composites in HCl, H 2 SO 4 and NaCl [11, 12]. * S. Suresh sonagirisuresh@gmail.com 1 Department of Mechanical Engineering, JNTUA, Anantapuramu, A.P, India 2 Department of Mechanical Engineering, MITS, Madanapalle, A.P 517325, India