Laser shock peening wavelength conditions for enhancing corrosion behaviour of titanium alloy in chloride environment

Laser shock peening (LSP): Electrochemical and hydrodynamic investigation of corrosion protection pre-treatment for a copper surface in 3.5 % NaCl medium

“…This shows that there was a tendency to reduce the corrosion rate in all the laser peened samples in comparison to the unpeened Cu, whereas the highest performance in corrosion rate reduction was found at LSPVC 50 %. The results not only confirm that the LSP modification is optimum at LSPVC 50 % but also showed that the LSP process is an effective method for Cu corrosion mitigation [7,9,19,51].…”

“…However, looking at the curve due to LSPVC 50 %, the E corr is in the active dissolution region of the anodic part, which shows extensive Tafel behaviour indicating a high rate of corrosion at the onset before exhibiting a reduction in corrosion current. This could be the evidence of the potential decay witnessed in the OCP analysis, probably due to the roughened part of the surface by high power density [7], compared to the less impacted surface at 40 and 70 % overlap with the lower power density of 4 and 6 Gw/cm 2 respectively. However, the power density effect on the LSPVC 50 % could not overturn the overall performance in the reduction of the corrosion current density as the surface is at the same time hardened by the compressive residual stress arising from the higher laser power.…”

“…Further investigation was carried out by Vijayalakshmi et al [7] on the effects of laser shock peening (LSP) on titanium alloy (Grade 5-Ti6Al4V) to establish the best set of LSP parameters for the enhancement of surface characteristics of the alloy. The result shows an excellent mechanical property for the peened surface compared to the unpeened.…”

“…The other peened samples, show minimal changes with time, probably due to reduced roughness. Power density tends to increase surface hardness with a consequent increase in roughness [7]. But the advantage of the improved hardness outweighs that of the roughness in the long run for the metal protection.…”

“…Several methods of surface modification techniques are in practice such as mechanical attrition, hot and cold rolling, high-pressure torsion, ball milling, mechanical shot peening, and laser shock peening to improve the surface microstructure, mechanical strength, corrosion resistance and tribological properties of the metallic material [3][4][5][6]. The surface treatment process focused on the present research is the laser shock peening (LSP) used for the improvement of corrosion protection and fatigue life of metals [7][8][9]. LSP is preferred to the rest of the processes because of its consistency in results and high-quality surface finish [10][11][12].…”