Effect of molybdenum, manganese and tungsten contents on the corrosion behavior and hardness of iron‐based metallic glasses

Abstract

The effects of molybdenum (Mo), manganese (Mn) and tungsten (W) on the corrosion behavior and hardness of iron-based metallic glasses (MG) were investigated by using electrochemical measurements, X-ray photoelectron spectroscopy, and micro-hardness tester. The results showed that the alloying elements (Mo, Mn, and W) have great influence on the corrosion behavior and hardness. Corrosion resistance of the MG increased with Mo and W content to a critical value (9.4 and 3.2 at%, respectively) and then decreased, while kept increasing with Mn. The corrosion behavior is dependent on the composition of the passive film. The protective Mo(IV), Mn(IV), and W(VI) oxide film on the surface attributes to the enhanced stability of the film. The hardness of the MG is not sensitive to the Mn content, but increased with the Mo and W content. Little influence on the hardness is found when the Mo content is higher than 9.4 at%. Based on the above mentioned influence of alloying elements, corrosion, and wear resistance can be balanced to meet the service of marine pump that served in both corrosive and erosive environments.

Corrosion Performance of Fe-Based Amorphous Coatings via Laser Cladding Assisted with Ultrasonic in a Simulated Marine Environment

“…In a 3.5 wt.% NaCl solution, the Fe element dissolves preferentially, and the Cr element is rapidly oxidized to form a passive film resistant to chloride ion erosion [37,38]. An appropriate amount of Mo element can improve corrosion resistance [39]. Although the Fe-based amorphous coating has the same nominal chemical composition as the bulk Fe-based amorphous alloy, crystallization is unavoidable during laser cladding, which results in the formation of crystalline phases such as BCC-Fe (Co, Cr) and (Fe n Cr 23−n ) (B m C 6−m ).…”

Improving the radiopacity of Fe–Mn biodegradable metals by magnetron-sputtered W–Fe–Mn–C coatings: Application for thinner stents

“…1 f and i). The presence of C in W coatings produced by sputtering, is known to promote the formation of W-rich metallic carbides [ 18 ]. Also, traces of -Fe (2 = ∼44°) were deduced in the P 400 sample XRD spectra, as Mn is well-known as a stabilizer of austenitic iron [ 2 ].…”

Mechanical properties and corrosion behaviour of developed high nitrogen high manganese stainless steels

“…However, a slight negative shift in corrosion potential (E corr ) is observed for alloy-b and this could be attributed to the absence of molybdenum which undergoes active/passive transition. The molybdenum addition shifts the corrosion potential (E corr ) to a positive potential and improves the corrosion resistance [42,43]. Hence, the molybdenum content in manganesecontaining stainless steel plays a role specifically in the acidic environment [44].…”