Environmentally assisted cracking behavior of U-bend specimens of Mg–RE alloys in chloride containing basic solution

Journal of Magnesium and Alloys

Nikunja Shrestha¹  Krishnan S. Raja²  Jakraphan Ninlachart³ 

[1] Corresponding author.;Chemical and Materials Engineering, University of Idaho, Moscow, ID 83844-1021, USA;Department of Marine Engineering, Academic Branch, Royal Thai Naval Academy, Samut Prakan 10270, Thailand;

关键词: Magnesium rare earth (Mg–RE) alloy;    Stress corrosion cracking;    Hydrogen assisted cracking;    Localized corrosion;   

DOI  :  

来源: DOAJ

【 摘 要 】

Environmentally assisted cracking (EAC) behavior of two Mg-rare earth (RE) alloys such as Mg–Zn–Gd–Nd–Zr (EV31A) and Mg–Y–Nd (WE43C) alloys was investigated by using U-bend specimens. Open circuit potentials (OCP) of the U-bend specimens were monitored during the EAC tests in 0.1 M NaOH solution with different chloride concentrations at room temperature. EV31A (as-received, and peak aged) and WE43C (peak aged) specimens failed by SCC in 80 ppm chloride containing 0.1 M NaOH solution at OCP. When the EAC initiation occurred, the OCP decreased continuously. Irregular fluctuations of the OCP were observed in the absence of EAC. The OCP versus time profile could be used for monitoring EAC failure of the Mg–RE alloy components in real life service. Applied potentials did not cause cracking of the EV31A alloy in 80 ppm Cl− containing 0.1 M NaOH. Accelerated cracking was observed on the WE43C alloy in peak-aged condition under the applied potentials in the transpassive region when compared to that of OCP condition. Overaging decreased the susceptibility to cracking.

【 授权许可】

Unknown