# Experimental and Simulation Study of the Effect of Plastic Residual Strain on the Electrochemical Corrosion of Biomagnesium Alloys

## TL;DR

This study explores how plastic residual strain affects the electrochemical corrosion of a magnesium alloy using experiments and simulations.

## Contribution

A novel coupled strain-corrosion analysis method is proposed, linking electrochemical corrosion kinetics with phase-field theory.

## Key findings

- A multiphysical model coupling deformation, corrosion phase, and material transfer was successfully simulated.
- The corrosion depth distribution in pre-strained specimens matched simulation results.
- A quantitative relationship between electrochemical corrosion kinetics and phase-field theory was established.

## Abstract

In this study, the effect of plastic residual strain on the corrosion behavior of ZK60 magnesium alloy was systematically revealed using a research method combining experimental characterization and numerical simulation. Based on the multiphysical field coupling theory, a numerical model containing deformation field, corrosion phase field, and material transfer field was constructed, and the dynamic simulation of plastic residual strain-induced corrosion damage was successfully realized. Tafel polarization curves obtained from electrochemical tests were fitted to the key parameters of the secondary current distribution. The kinetic parameter L controlling the corrosion rate in the phase-field model was innovatively determined by the inverse calibration method, and a quantitative relationship between the kinetics of electrochemical corrosion and the phase-field theory was established. The corrosion depth distribution of the pre-strained specimens is quantitatively characterized and the results are in agreement with the finite element simulation results. The coupled strain-corrosion analysis method proposed in this study provides a theoretical basis for the design and life prediction of corrosion resistance of components under complex stress states.