Influence of Fe content on corrosion and hydrogen pick up behavior of Zr–2.5Nb pressure tube material

Microstructural analysis of impurity segregation around β-Nb precipitates in Zr–Nb alloy using positron annihilation spectroscopy and atom probe tomography

“…The dispersion of b-Nb precipitate in a-Zr matrix has been suggested to beneficial changes in corrosion and hydrogenation resistance [2][3][4][5][6]. Therefore, Nb precipitates have been widely studied mainly using transmission electron microscopy (TEM).…”

“…Therefore, Nb precipitates have been widely studied mainly using transmission electron microscopy (TEM). Several investigations have shown that Nb precipitation is strongly affected by Fe [6,7], which is a common impurity due to its high chemical reactivity with Zr. A high-resolution TEM (HRTEM) study of the effects of Fe on Nb precipitation in Zr-Nb alloys [8] showed that the nature of the interface between Nb-Fe precipitates and a-Zr matrix is different from that of the b-Nb/a-Zr interface.…”

Corrosion of Zr-1Nb and Zr-2.5Nb in 0.1 M LiOH at 343°C

“…1b-1d) would facilitate the hydrogen diffusion into the material [Hatano et al, 2000] and affect the oxide integrity, promoting oxide spalling as seen in aged Zr-1Nb ( + ). In a recent work, Choudhuri et al (2013) studied the hydrogen absorption of Zr-2.5Nb with different iron contents (300, 800 and 1250 ppm Fe) autoclaved during three days in 415°C steam. They found that H uptake was doubled for tubes containing 1250 ppm Fe.…”

Corrosion of New Zirconium Claddings in 500 °C/10.3 MPa Steam: Effects of Alloying and Metallography

“…Characterization of the oxide film has been performed to demonstrate the difference between N2 and N36. The fracture morphology of oxide film is characterized to show the oxide thickness, the grain structure, the cracks and even pores [36] inside the oxide film [15,20,58].…”

“…It is confusing that a small amount of alloying additives could dramatically improve the corrosion resistance, turning the oxide structure into a dense protective film [1,4]. So far, there are numerous experiments carried out on the effects of alloying [13][14][15]. Besides Sn, Nb, Fe, Cr [16][17][18][19][20], the addition and adjustment of Cu, V, Ge, Mo, Bi, etc.…”