Isolating the texture effect on corrosion property of ultra-fine-grained high-purity magnesium

Abstract Magnesium is considered a promising biodegradable biomedical material, but its overly fast corrosion and degradation have become a key limitation for clinical applications. In this study, by controlling the grain size of high-purity magnesium while keeping the texture intensity almost unchanged, we only looked at how dislocation density affects its corrosion rate. We found that as the dislocation density increases, the sample's corrosion rate keeps speeding up, and the acceleration frequency also rises. Additionally, by keeping the grain size constant through processing methods, we explored how dislocation density and strong basal texture affect the corrosion rate of high-purity magnesium. Combining the isolated effect of dislocation density obtained in this work, we could isolate dislocation density and just examine how strong basal texture impacts the corrosion performance of high-purity magnesium. The results show that as texture intensity increases, high-purity magnesium's corrosion resistance also improves. This is because the basal plane has the best corrosion resistance, and as the texture intensity rises, the proportion of basal plane increases, leading to a decrease in the corrosion rate in m-SBF. Eventually, we established a phenomenological model relating texture intensity to the corrosion rate of high-purity magnesium.