Effects of Alloying Elements on the Corrosion Behavior of Sputter–deposited Zr–(12–21)Cr–W Alloys in 0.5 M NaCl Solution

Abstract

The synergistic effect of the simultaneous additions of tungsten and zirconium in the sputter-deposited amorphous or nanocrystalline

Roles of Alloying Elements on the Passivity of W-xCr-yNi Alloys in Aggressive Environments

“…It has been reported that the sputterdeposited amorphous or/and nanocrystalline tungsten-based W-xTi (Bhattarai 2009a, 2009b, Bhattarai et al 1995, Sharmah et al 2007), W-xNi (Bhattarai 2001, Sah & Bhattarai 2008), W-xNb (Bhattarai 2011a, Bhattarai et al 1998a, 1998b, Jha & Bhattarai 2008), W-xCr (Bhattarai et al 1998c, Basnet and Bhattarai 2010, WxTa (Bhattarai 2011b, 2012a, Bhattarai & Baral 2013, Bhattarai et al 1998d), W-xMo (Bhattarai 2006, 2012b, Khadka & Bhattarai 2010, W-xZr (Bhattarai et al 1997, Shrestha & Bhattarai 2010, W−xZr−yCr (Aryal & Bhattarai 2010, Bhattarai 2010a, 2011c, 2011d, Kumal & Bhattarai 2011) and W−xCr−yNi (Bhattarai 2009c, 2010b, Bhattarai & Kharel 2009-10, Kharel & Bhattarai 2009) alloys were spontaneously passivated showing significantly higher corrosion resistance than those of alloy-constituting elements in aggressive solutions. The significant improvement of the corrosion resistance properties of these alloys is attributed to the formation of double oxyhydroxide passive films containing both tungsten and alloyconstituting metal cations.…”

The Corrosion Behavior of Sputter?deposited W?xTa Alloys in 0.5 M NaCl Solution

“…Since the extremely high corrosion resistance amorphous iron-base alloys were reported in 1970's (Hashimoto & Masumoto 1976, Hashimoto et al 1976, 1979, Naka et al 1974, 1976, varieties of corrosion-resistant rapidly quenched and sputter-deposited alloys were developed during the last four decades. Since 1990's, it has been reported that the sputter-deposited binary tungsten-titanium (Bhattarai 1998a, b, Bhattarai et al 1995, tungsten-zirconium (Bhattarai 1998, Bhattarai et al 1997, Shrestha & Bhattarai 2010, tungsten-chromium (Basnet & Bhattarai 2010, Bhattarai 1998, Bhattarai et al 1998, tungsten-niobium (Bhattarai 1998Bhattarai et al 1998b, Jha & Bhattarai 2008, tungstentantalum (Bhattarai 1998b, 2012, tungsten-molybdenum (Bhattarai 1995, 2006b, Khadka & Bhattarai 2010 and tungsten-nickel (Bhattarai 1995, Bhattarai et al 2007, Sah & Bhattarai 2008, and ternary tungsten-based (Aryal & Bhattarai 2010a, b, 2011c, d, Kumal & Bhattarai 2010 alloys showed higher corrosion resistance than those of alloy-constituting elements in different corrosive environments.…”

Roles of Alloying Elements on the Corrosion Behavior of Amorphous W–Zr–(15–33)Cr Alloys in 1 M NaOH Solution

“…The average corrosion rate of the alloys was estimated from the weight loss after immersion for 240 h in 1 M NaOH solution open to air at 25 o C. The weight loss for each alloy specimen was estimated two times or more and the average corrosion rate was calculated as described elsewhere 4,30 . The time dependence of the corrosion rate of the W-Zr-(15-33)Cr alloys was also estimated at various time intervals.…”