Study on the role of niobium in corrosion mechanism of low-alloy pipeline steel in H2S-saturated solution

Effects of Niobium Addition on the Mechanical Properties and Corrosion Resistance of Microalloyed Steels: A Review

“…Niobium has shown great potential in preventing the corrosion of microalloyed steels, especially in corrosive environments. Several studies have investigated the effect of the niobium content on the corrosion resistance and durability of steel structures [9,12,17,40,[45][46][47][48].…”

“…The addition of 0.05 and 0.10 wt.% Nb reduced the corrosion rate by 28% and 54%, respectively (see Figure 4). The Nb effects on the corrosion resistance induced by hydrogen sulfide (H 2 S) were studied by Liu et al [9]. The H 2 S solution was prepared by injecting distilled water into an autoclave, and then, nitrogen with 99.99% purity was injected to eliminate oxygen from the solution.…”

“…Furthermore, small additions of other elements, such as chromium (Cr), nickel (Ni), molybdenum (Mo), copper (Cu), nitrogen (N), vanadium (V), niobium (Nb), titanium (Ti), and zirconium (Zr) can be combined to achieve improved mechanical and durability properties [8]. It is well known that Nb addition improves steel's strength and toughness through the precipitatestrengthening effect that produces grain refinement at the microstructural level [9][10][11][12][13]. Compared to other elements, Nb also presents a lower mass, inducing higher performance.…”

“…The Nb particles precipitate on the steel substrate, delaying the recrystallization process and promoting non-recrystallization, which results in finer grains [14]. The precipitates act as barriers that hinder the dislocation movement, and thus, more energy is required during the material deformation [9]. According to Zhang et al [10], a 0.034 wt.% Nb addition can generate grain refinement of up to 71% compared to steels without Nb added.…”