Abstract
The last decade has witnessed considerable advancements in nanostructured material synthesis and property characterization. However, there still exists some deficiency in the mechanical and surface property characterization of these materials. In this paper, the erosion corrosion (E-C) behavior of nanostructured copper was studied. The nanostructured copper was produced through severe plastic deformation (SPD) by applying four passes of equal channel angular pressing (ECAP). The combined effects of the testing time, impact velocity, and concentration of erosive solid particles (i.e., sand concentration) on the E-C behavior of nanostructured copper were then examined. Based on a defined domain for the testing time, impact velocity, and sand concentration, E-C tests were performed for numerous combinations of test points via the slurry pot method. The test points were selected using the face-centered center composite design of experiments to enable visualization of the test results through surface plots. The extent of E-C on the test specimens was determined by measuring the mass loss. Polynomial regression and Kriging were used to fit surfaces to the experimental data, which were subsequently used to generate surface plots. The results showed that the E-C of nanostructured copper is best described by a quadratic function of testing time, velocity, and erosive solid particle concentration. The results also revealed that E-C increases with an increasing testing time, impact velocity, and erosive solid particle concentration. In addition, it was observed that the effect of the erosive solid particles on E-C is further intensified by an increased impact velocity.
Highlights
The interaction between erosion and corrosion (E-C) is known to be a major cause of the deterioration of the performance of pumps, turbines, pipelines, and other similar equipment [1,2,3,4,5,6,7].Corrosion damages the material surface through an electrochemical reaction [8,9], whereas erosion involves the removal of material through a mechanical process
The surface plots based on polynomial regression (Figures 7b, 8b and 9b) and Kriging (Figures 10b, 11b and 12b) reveal that the synergetic effect of the three parameters on the E-C behavior of nanostructured equal channel angular pressing (ECAP) copper is much greater than the effect of each individual parameter
It was established that nanostructured copper is more superior in terms of resisting E-C than traditional standard copper
Summary
The interaction between erosion and corrosion (E-C) is known to be a major cause of the deterioration of the performance of pumps, turbines, pipelines, and other similar equipment [1,2,3,4,5,6,7]. Many studies have shown that E-C behavior depends on various variables such as the solid particle geometry (size, shape, etc.), flow velocity, impact angle, slurry composition, tested material, and temperature [13,14]. The E-C behavior of the aluminum alloy AA6061 was investigated [33]; the results demonstrated that the E-C rate is significantly affected by the testing time, flow velocity, and projected area of the samples. An experimental study was conducted to compare the E-C behavior of standard pure (as received) and nanostructured copper produced by ECAP for different parameters. The combined effect of time, impact velocity, and erodent concentration (sand) on the E-C of nanostructured ECAP copper was studied. A discussion of the combined effect of the experimental parameters on the E-C behavior of ECAP copper is presented
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