Effect of TiO2@Carbon Nanotubes and Praseodymium on the Microhardness and Corrosion Properties of AZ91 Alloy.

Autor: Ran, Qianwen, Yan, Hong, He, Jiajia, Li, Ning, Lei, Yushun
Zdroj: Metals & Materials International; Aug2022, Vol. 28 Issue 8, p2012-2022, 11p
Abstrakt: Effect of 1 wt% TiO2@carbon nanotubes (TiO2@CNTs) and 1 wt% praseodymium (Pr) on the microhardness and corrosion properties of AZ91 magnesium alloy were discussed. The microhardness test, electrochemistry test that AZ91 magnesium alloy with 1 wt% TiO2@CNTs and 1 wt% Pr addition exhibits excellent microhardness (111 HV), low corrosion current density (0.165 mA·cm−2), and low polarization resistance (537.15 Ω·cm2) compared with AZ91 magnesium alloy (89 HV, 0.184 mA·cm−2, 261.06 Ω·cm2). After 1 wt% TiO2@CNTs and 1 wt% Pr added to AZ91, the average crystallite size was reduced and microhardness was increased. Additionally, the Al11Pr3 phase formed by the combination of Pr and Al transformed the morphology of β-Mg17Al12 phase into weeny particles and decreased the volume fraction of β-Mg17Al12 phase. The reduction and refinement of cathode phase (β-Mg17Al12 phase) weakened the micro-galvanic corrosion and slowed down the corrosion rate. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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