scholarly journals Corrosion Behavior of Extruded AM60-AlN Metal Matrix Nanocomposite and AM60 Alloy Exposed to Simulated Acid Rain Environment

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 990
Author(s):  
Luis Chávez ◽  
Lucien Veleva ◽  
Sebastián Feliu ◽  
Danai Giannopoulou ◽  
Hajo Dieringa
Keyword(s):  
Acid Rain ◽  
Metal Matrix ◽  
Electrochemical Impedance ◽  
Simulated Acid Rain ◽  
Localized Corrosion ◽  
Solution Ph ◽  
Transfer Resistance ◽  
Composite Surface ◽  
Metal Matrix Nanocomposite ◽  
Matrix Nanocomposite

The present work compared the initial stages of corrosion process development on the AM60-AlN metal matrix nanocomposite surface and on AM60, during their exposure for 30 days to simulated acid rain solution (SAR). The AlN nanoparticles were observed as “attached” to those of Mn-rich AlMn intermetallic particles, forming clusters. The introduction of 1.0 wt.% AlN (≈ 80 nm) in the AM60 alloy carried a slight grain refinement and favored the formation of a denser and more protective corrosion layer, suggested by the electrochemical impedance spectroscopy (EIS) values of higher charge transfer resistance (R2) and capacitance, characteristic of the double layer in the presence of corrosion products, and also suggested by Rn (EN) values, compared to those of the AM60 alloy. Thus, the concentration of the released Mg-ions from the composite surface was lower. Due to the increase in time of the SAR solution pH, Al de-alloying may occur, as well as Al(OH)3 formation, as confirmed by XPS analysis. Due to the presence of Cl-ions in SAR solution, localized corrosion was observed, suggested as fractional Gaussian noise of a stationary and persistent process in time, according to the PSD of the corrosion current fluctuations (EN).

scholarly journals Nanocomposite Coatings in Corrosion Protection Applications: An Overview

2021 ◽  
Vol 37 (5) ◽  
pp. 1062-1067
Author(s):  
Brindha T ◽  
Rathinam R ◽  
Dheenadhayalan S ◽  
Sivakumar R
Keyword(s):  
Corrosion Protection ◽  
Metal Matrix ◽  
Nanocomposite Coatings ◽  
Future Research ◽  
Matrix Metal ◽  
Metal Matrix Nanocomposite ◽  
Metal Metal ◽  
Plastic Powder ◽  
Metal Polymer ◽  
Matrix Nanocomposite

Corrosion is one of the biggest problems which affects the economy of the country, which occurs as a result of the interaction of the metal with its surroundings. One of the easiest ways to prevent corrosion is coatings of the metals with paint, plastic or wood. Several types of coatings have been adopted by corrosion scientists in the prevention of corrosion that are mainly based on electrochemical principles. Fortunately, based on cost and effectiveness, four types of coatings are variably employed by the metal and metallurgy industries. One among the cheapest and effective way to prevent corrosion is to use barrier coatings like plastic, powder and paint. Hence, nanocomposite coatings by electrochemical deposition offers an excellent, scratch and corrosion resistance on the metal surface. These coatings may be used to restoration of the components instead of interchanging them, resulting in reduced maintenance costs and disturbance. Significant improvements in the corrosion protection of steel have been reported by using metal-metal matrix, metal-metal oxide matrix, metal-polymer matrix, and ceramic-metal matrix nanocomposite. This review presents an overview of works related to nanocomposite coatings and to re-evaluate the literature for the future research in the field that still lacks validation.

scholarly journals Enhancement of the mechanical properties of an aluminum metal matrix nanocomposite by the hybridization technique

2016 ◽  
Vol 5 (3) ◽  
pp. 241-249 ◽  
Author(s):  
Kalidindi Sita Rama Raju ◽  
Vegesna Ramachandra Raju ◽  
Penumetsa Rama Murty Raju ◽  
Siriyala Rajesh ◽  
Ghosal Partha
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix ◽  
Hybridization Technique ◽  
Aluminum Metal ◽  
Metal Matrix Nanocomposite ◽  
Matrix Nanocomposite

Quantifying boundary effect of nanoparticles in metal matrix nanocomposite fabrication processes

2012 ◽  
Vol 44 (7) ◽  
pp. 551-567 ◽  
Author(s):  
Li Zeng ◽  
Qiang Zhou ◽  
Michael P. De Cicco ◽  
Xiaochun Li ◽  
Shiyu Zhou
Keyword(s):  
Metal Matrix ◽  
Boundary Effect ◽  
Metal Matrix Nanocomposite ◽  
Matrix Nanocomposite

Use of Salvia hispanica as an eco-friendly corrosion inhibitor for bronze in acid rain

2017 ◽  
Vol 64 (6) ◽  
pp. 654-663 ◽  
Author(s):  
A.K. Larios-Galvez ◽  
J. Porcayo-Calderon ◽  
V.M. Salinas-Bravo ◽  
J.G. Chacon-Nava ◽  
Jose Gonzalo Gonzalez-Rodriguez ◽  
...  
Keyword(s):  
Acid Rain ◽  
Corrosion Inhibitor ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Simulated Acid Rain ◽  
Salvia Hispanica ◽  
Content Type ◽  
Green Corrosion Inhibitor ◽  
New Information ◽  
Practical Implications

Purpose The purpose of this research paper was to investigate the use of methanolic extract of Salvia hispanica (S. hispanica) as a green corrosion inhibitor for bronze in a simulated acid rain solution. Design/methodology/approach Extract of S. hispanica was used as a green corrosion inhibitor for bronze in simulated acid rain solution. Electrochemical techniques such as potentiodynamic polarization curves, electrochemical impedance spectroscopy and electrochemical noise were used. Parameters such as polarization, charge transfer and noise resistance (Rp, Rct and Rn, respectively) were calculated. Findings Results showed that the extract acts as a good, anodic type of inhibitor. The inhibitor efficiency increased with increasing its concentration up to 400 ppm, decreasing beyond this concentration. Efficiency also increased with an increase in the immersion time. The inhibition was due to the adsorption of components found in the S. hispanica extract following a Langmuir adsorption isotherm. Practical implications S. hispanica extract can be used as a corrosion inhibitor for bronze in acid rain solution. Originality/value This study provides new information on the inhibition features of S. hispanica under specific conditions. This eco-friendly inhibitor could find applications to protect bronze exposed to polluted urban atmospheres.

scholarly journals Investigation of Protective Performance of a Mg-Rich Primer Containing Aluminum Tri-Polyphosphate on AZ91D Magnesium Alloy in Simulated Acid Rain

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 649 ◽  
Author(s):  
Xiangyu Lu ◽  
Sichen Sun ◽  
Qiqi Fan ◽  
Xiangjun Pei ◽  
Yuchao Dun ◽  
...  
Keyword(s):  
Acid Rain ◽  
Cathodic Protection ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Open Circuit ◽  
Simulated Acid Rain ◽  
Protective Film ◽  
Az91d Alloy ◽  
Testing Environment ◽  
Protective Performance

Mg-rich primer (MRP) containing aluminum tri-polyphosphate functions via a galvanic mechanism to protect AZ91D alloy from corrosion in the 3 wt % NaCl solution. However, its protective performance can be strongly affected by the testing environment. Therefore, it is important to investigate the performance of the primer on magnesium alloys in an acid rain environment. In the present study, the protective performance of MRP with or without aluminum tri-polyphosphate was investigated via open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) in the simulated acid rain. Compared to the primer without aluminum tri-polyphosphate, the MRP containing aluminum tri-polyphosphate pigments exhibited better protective performance in the simulated acid rain condition. In the initial stage, the acidic condition prompted the aluminum tri-polyphosphate pigments to release phosphates and H+ to form magnesium phosphates on Mg particles, retarding their consumption rate. The Mg-rich primer with aluminum tri-polyphosphate can provide cathodic protection to AZ91D alloy for about 49 days in the simulated acid rain solution. Simultaneously, the corrosion products of Mg particles, magnesium oxides and phosphates, precipitated on the Mg particles and improved the stability of the primer. In addition, a protective film, consisting of magnesium oxides and phosphates, formed on the AZ91D substrate. Consequently, all these factors contributed to the long cathodic protection and improved corrosion resistance of MRP containing aluminum tri-polyphosphate in the simulated acid rain.

Mechanical Behavior of a Metal Matrix Nanocomposite Synthesized by High-Pressure Torsion via Diffusion Bonding

2016 ◽  
Vol 879 ◽  
pp. 1068-1073
Author(s):  
Han Joo Lee ◽  
Jae Kyung Han ◽  
Byung Min Ahn ◽  
Megumi Kawasaki ◽  
Terence G. Langdon
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Metal Matrix ◽  
Room Temperature ◽  
High Pressure Torsion ◽  
Ambient Temperatures ◽  
Metal Matrix Nanocomposite ◽  
Wide Range ◽  
Zk60 Magnesium Alloy ◽  
Matrix Nanocomposite

High-pressure torsion (HPT) is one of the major severe plastic deformation (SPD) procedures where disk metals generally achieve exceptional grain refinement at ambient temperatures. HPT has been applied for the consolidation of metallic powders and bonding of machining chips whereas very limited reports examined the application of HPT for the fabrication of nanocomposites. An investigation was initiated to evaluate the potential for the formation of a metal matrix nanocomposite (MMNC) by processing two commercial metal disks of Al-1050 and ZK60 magnesium alloy through HPT at room temperature. Evolutions in microstructure and mechanical properties including hardness and plasticity were examined in the processed disks with increasing numbers of HPT turns up to 5. This study demonstrates the promising possibility for using HPT to fabricate a wide range of hybrid MMNCs from simple metals.

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