The effect of tantalum addition on the corrosion behavior of W-xTa alloys in 1 M NaOH solution

Abstract

The role of tantalum addition on the corrosion behavior of the sputter-deposited nanocrystalline and amorphous W-xTa (x=8-77) alloys was studied in 1 M NaOH solution open to air at 25°C using corrosion tests and electrochemical measurements. Tungsten and tantalum metals act synergistically in enhancing the corrosion resistant properties of the W-xTa alloys and hence addition of 23 at% or more tantalum to the alloys were found to be effective to lower the corrosion rate of the alloys than those of alloy-constituting tungsten and tantalum elements. The corrosion rates of the W-xTa alloys containing 23-77 at% tantalum are nearly two orders of magnitude lower than that of tungsten and even slightly lower than that of tantalum in 1 M NaOH. Addition of tantalum metal in W-xTa alloys is effective for ennoblement of the open circuit corrosion potential of the tungsten metal in 1 M NaOH solution 25°C.DOI: http://dx.doi.org/10.3126/bibechana.v10i0.8363 BIBECHANA 10 (2014) 1-8

An overview on the non-destructive in-depth surface analysis of corrosion-resistant films: A case study of W-xCr deposits in 12 M HCl solution

“…To solve such a problem of the preparation of Wbased alloys in a wide composition range was successfully solved using the sputter deposition technique since 1995 AD. The sputter-deposited binary amorphous or nano-crystalline tungsten alloying with metals; chromium [44][45][46][47], titanium , zirconium [29,53], molybdenum [54][55][56], niobium [57][58][59][60], and tantalum [61][62][63][64], nickel [65][66][67], and ternary W-Cr-Ni [68][69][70][71] and W-Cr-Zr [72][73][74][75][76][77][78][79] alloys were prepared in the wide composition range and they showed higher corrosion resistance than those of alloy-constituting metals in corrosive environments of HCl, NaCl, and NaOH solutions.…”

Study on the synergism of corrosion-resistant W-xNb alloys by angle-resolved X-ray photoelectron spectroscopy

“…Niobium and tungsten metals are believed as efficient alloying elements for making corrosionresistant alloys (Chen et al, 2017). Previous studies give detailed efforts for successfully preparing a single-phase amorphous/nanocrystalline W-based (Bhattarai, 2002;Aryal and Bhattarai, 2010;Baral and Bhattarai, 2014;Khadka and Bhattarai, 2014), and Nb-based (Leinartas et al, 2015) deposits using the technique of sputtering. These binary alloys were reported to be spontaneously passive and they showed a low corrosion rate in offensive environments even though they showed a lower corrosion rate than one of alloying elements of all the alloys.…”