Investigation of corrosion behavior on plastically deformed aa 7075 t651 by shot peening process

As AA 7075 T651 comprehensively is used in the marine naval vessels, the factor of corrosion performance always plays a significant role. In this work, an investigation is carried out to study the effect of corrosion behavior of shot peened AA 7075 T651 in 3.5% solution. From the potentio-dynamic polarization study, a 27.72% decrease is ascertained in the I-corr in shot peened specimen in correlation to unpeened aluminium alloy. A drop in I-corr from 1.883 to 1.480 mA cm(-2) in shot peened specimen, indicates enhanced pitting corrosion resistance. An electrochemical impedance spectroscopy reveals a surge in the oxide layer formation on the peened surface aiding the drop in corrosion rate. Resistance to pit formations and improvement in oxygen deposition in the peened specimen is observed availing a Scanning Electron Microscopy (SEM) and Energy Dispersive x-ray analysis (EDX). The micro structures of the peened and unpeened specimen are captured using optical microscopy and Transmission electron microscopy (TEM). Micro-strain, dislocation density is also calculated from the x-ray diffraction analysis (XRD), in which grain size reduces by 28.07%, dislocation density surges by 38.65% and micro strain increases by 21.95% in peened specimen in correlation to unpeened AA 7075 T651. As a result of these improvements the corrosion resistance by 27.92% in the peened specimen in correlation to unpeened aluminium alloy.

Automated summary

This study investigates the corrosion behavior of shot peened AA 7075 T651 in a 3.5% solution, revealing that shot peening can improve pitting corrosion resistance and enhance oxide layer formation on the alloy surface. The research shows that shot peening leads to a decrease in corrosion rate and an increase in resistance to pit formations, as observed through SEM and EDX analysis.