Analysis of nitrogen ion implantation on the corrosion resistance and mechanical properties of aluminum alloy 7075

Abstract

The present work reports the effect of nitrogen ion implantation on aluminum alloy 7075. The microhardness, corrosion resistance, and surface nanostructure were investigated. The implantation was carried out at energy 60 keV with the ion doses used were 1.70 × 1017 ion/cm2, 1.86 × 1017 ion/cm2, 2.02 × 1017 ion/cm2, 2.17 × 1017 ion/cm2, and 2.33 × 1017 ion/cm2. The microhardness test was performed to study the hardness of the implanted layer which was characterized by X-ray Diffraction (XRD). The potentiodynamic corrosion test was performed in a 0.5 mol/l NaCl solution. The surface nanostructure was investigated by atomic force microscopy (AFM) to study the surface roughness after implantation. The results showed that the microhardness after implantation at 2.17 × 1017 ion/cm2 increased by 90.81%. The increase was attributed to the formation of the AlN phase. The AlN phase was confirmed at 2-theta peaks of 39.53°, 45.84°, 66.90°, and 80.54°. The corrosion test showed the improvement of corrosion resistance by the decrease of corrosion rate from 4.49 mpy to 1.43 mpy. The atomic force microscopy showed the arithmetical mean height (Sa) value was 37.5 nm and the root means square (Sq) value was 47.6 nm. The ion implantation induced the change of material surface due to the penetration of nitrogen ion into the material.

Influence of ion implantation on corrosion resistance of the nickel over steel

“…These changes can be caused due to the penetration of the N + ion into the material. The roughness value of the sample also depends on the initial condition of the surface before implantation, the energy of the beam used, the implantation dose and the implanted element [57].…”

N+-Implantation on Nb Coating as Protective Layer for Metal Bipolar Plate in PEMFCs and Their Electrochemical Characteristics

“…Moreover, the implanted ions could contribute to further improvement in corrosion behavior. As a dopant ion, the implanted nitrogen ions (N + ) lead to improved corrosion behavior and mechanical properties [ 17 , 18 , 19 , 20 , 21 ]. Hence, we expected that the implantation of N + ions on the Nb layer would modify its structural properties and reinforce its corrosion resistance ability.…”