<span style="font-size:11.0pt;font-family:"Calibri","sans-serif"; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman";mso-ansi-language:EN-US;mso-fareast-language: EN-US;mso-bidi-language:AR-SA">V₂O₅ accelerated hot corrosion of nickel in alkali sulphates melt</span>

Abstract

<span style="font-size:11.0pt;font-family:" calibri","sans-serif";="" mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"times="" new="" roman";="" mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:minor-latin;="" mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Effect of addition of V₂O₅ on hot corrosion of nickel in alkali (Li, Na, K)₂ SO₄ melts has been studied at 550°C by electrochemical polarization method; Corrosion potential <i>(E_corr) </i>observation under open circuit potential (OCP) condition attributes a shift of E_corr in positive potential direction with the increase of V₂O₅ concentration in the melt. Corrosion rate (<i style="mso-bidi-font-style:normal">I</i>_corr) measurement indicates an order of magnitude higher oxidation rate in presence of even 1% V_{<span style="mso-bidi-font-style:italic">2</span>}<span style="mso-bidi-font-style:italic">O₅<i> </i>while three orders of magnitude higher oxidation rate is noted after addition of 5 % V_{<span style="mso-bidi-font-style:italic">2</span>}<span style="mso-bidi-font-style: italic">O₅ in the melt. XRD analysis of the scale identifies the presence of NiS, NiS₂, Ni(VO₃)₂ as major constituents of the scale along with other minor constituents.</span></span></span>