Tribochemical Behavior of Pure Magnesium During Sliding Friction

Abstract

Reciprocating sliding friction tests were conducted on pure magnesium using a UMT-II tester. The tribo-chemical behavior was characterized using X-ray photoelectron spectroscopy (XPS) and electron probe micro-analyzer (EPMA), which showed that the tribo-chemical behavior of pure magnesium was due to a tribo-oxidation reaction. At room temperature, the debris layer on the worn surface contained Mg(OH)2, MgO, and MgCO3. According to the reciprocating sliding friction mechanism, the decomposition of MgCO3 into MgO should occur. XPS results revealed that the surface oxide layer, containing Mg(OH)2, and MgO, acted as a third layer to protect the surface. Apparently, Mg(OH)2·nH2O was the main tribo-chemical product of pure magnesium under sliding friction.

Influence of Mg Doping Levels on the Sensing Properties of SnO2 Films

“…The results in Figure 6a show the Mg 1s spectrum for the MTO1 and MTO2 films at a lower energy (~1303.6 eV) than that recorded for the MTO3 films, which display a shift to a higher energy (~1303.8 eV) most likely due to the oxidation of Mg [30,34]. The Mg KLL Auger spectrum (Figure 6b [35,36]. These results are in line with the MgO diffractions identified by XRD ( Figure 2).…”

Lithium nitrate salt-assisted CO2 absorption for the formation of corrosion barrier layer on AZ91D magnesium alloy

“…In contrast, the MgCO 3 contatning barrier layer present on Li-2.5-2.5 AZ91 showed the lowest wear rate, which can be due to the partial smearing of the barrier layer in the matrix and increasing the shear strength of the substrate. 61 …”

Phosphate in Aqueous Solution Adsorbs on Limestone Surfaces and Promotes Dissolution

“…The high-resolution Mg1s XPS maps were deconvolved, as shown in Figure 8e,f, and it was discovered that three distinctive peaks appeared in the 100 mg/L experimental group, of which 1304.8 eV was attributed to Mg(OH) 2 and 1303.88 eV to MgO [42]. It was speculated from the findings of the XRD analysis that 1300.25 eV might be related to the Mg-P compounds; four distinctive peaks observed in the 2 mg/L experimental group, of which 1037.15 eV was assigned to Mg 2 PO 4 (OH) [43], 1035 eV to MgCO 3 [44], 1304.25 eV to Mg(OH) 2 , and 1303.57 eV to MgO [42]. These findings indicate that Mg-P compounds moved to the region of higher binding energy at lower Mg concentrations, whereas other Mg-containing compounds' binding energies increased as the Mg concentration increased, suggesting that Mg 2+ interacted with phosphates and other carriers [45].…”