The Effect of Deep Cryogenic Treatment on the Corrosion Behavior of Mg-7Y-1.5Nd Magnesium Alloy

Abstract

Abstract:The effect of quenching on the corrosion resistance of Mg-7Y-1.5Nd alloy was investigated. The as-cast alloy was homogenized at 535 • C for 24 h, followed by quenching in air, water, and liquid nitrogen. Then, all of the samples were peak-aged at 225 • C for 14 h. The microstructures were studied by scanning electron microscopy, energy-dispersive spectrometry, and X-ray diffraction. Corrosion behavior was analyzed by using weight loss rate and gas collection. Electrochemical characterizations revealed that the T4-deep cryogenic sample displayed the strongest corrosion resistance among all of the samples. A new square phase was discovered in the microstructure of the T6-deep cryogenic sample; this phase was hugely responsible for the corrosion property. Cryogenic treatment significantly improved the corrosion resistance of Mg-7Y-1.5Nd alloy.

Corrosion Resistance of Mg72Zn24Ca4 and Zn87Mg9Ca4 Alloys for Application in Medicine

“…The chemical composition of individual phases was determined by EDS (secondary electron mode) analysis and is given in Tables 2 and 3. As shown in Figure 1, the microstructure of the as-cast alloy consists of the α-Mg matrix, particle phases, and skeleton phases [41][42][43][44]. The phases occurring in the tested alloys are Mg 39 Zn for the Mg 72 Zn 24 Ca 4 alloy ( Figure 1a) and Mg 2 Zn 11 for the Zn 87 Mg 9 Ca 4 alloy ( Figure 1b).…”

“…As shown in Figure 1 , the microstructure of the as-cast alloy consists of the α-Mg matrix, particle phases, and skeleton phases [ 41 , 42 , 43 , 44 ]. The phases occurring in the tested alloys are Mg 39 Zn for the Mg 72 Zn 24 Ca 4 alloy ( Figure 1 a) and Mg 2 Zn 11 for the Zn 87 Mg 9 Ca 4 alloy ( Figure 1 b).…”

Corrosion: Critical Challenge in Wider Use of Magnesium Alloys

“…This coating was found to provide a five-fold improvement in the corrosion resistance in human body fluid. This study also includes thorough electrochemical analysis, and provides a mechanistic insight into the improvement in corrosion resistance due to the composite coating.In the second study, alloying elements were added to magnesium to develop secondary precipitates for strengthening [2]. These secondary precipitates are invariably highly cathodic to the magnesium alloy solid solution matrix, and hence, cause severe localised corrosion.…”

“…In the second study, alloying elements were added to magnesium to develop secondary precipitates for strengthening [2]. These secondary precipitates are invariably highly cathodic to the magnesium alloy solid solution matrix, and hence, cause severe localised corrosion.…”