The Corrosion Behavior of Intermetallic Compounds Ni_3(Si,Ti) and Ni_3(Si,Ti)+2Mo in Acidic Solutions
The Corrosion Behavior of Intermetallic Compounds Ni_3(Si,Ti) and Ni_3(Si,Ti)+2Mo in Acidic Solutions
复制标题
金属间化合物Ni_3(Si,Ti)和Ni_3(Si,Ti) 2Mo在酸性溶液中的腐蚀行为
DOI：
10.1016/j.apsusc.2011.03.027
复制
发表时间：
2011
影响因子：
6.7
通讯作者：
G.Priyotomo
中科院分区：
文献类型：
--
作者：
M. Funato and Y. Kawakami;熊井 玲児;M.Sasaki;G.Priyotomo
The corrosion behavior of the intermetallic compounds homogenized, Ni3(Si,Ti) (L12: single phase) and Ni3(Si,Ti) + 2Mo (L12and (L12+ Niss) mixture region), has been investigated using an immersion test, electrochemical method and surface analytical method (SEM; scanning electron microscope and EPMA: electron probe microanalysis) in 0.5 kmol/m3H2SO4and 0.5 kmol/m3HCl solutions at 303 K. In addition, the corrosion behavior of a solution annealed austenitic stainless steel type 304 was studied under the same experimental conditions as a reference. It was found that the intergranular attack was observed for Ni3(Si,Ti) at an initial stage of the immersion test, but not Ni3(Si,Ti) + 2Mo, while Ni3(Si,Ti) + 2Mo had the preferential dissolution of L12with a lower Mo concentration compared to (L12+ Niss) mixture region. From the immersion test and polarization curves, Ni3(Si,Ti) + 2Mo showed the lowest corrosion resistance in both solutions and Ni3(Si,Ti) had the highest corrosion resistance in the HCl solution, but not in the H2SO4solution. For instance, it was found that unlike type 304 stainless steel, these intermetallic compounds were difficult to form a stable passive film in the H2SO4solution. The results obtained were explained in terms of boron segregation at grain boundaries, Mo enrichment and film stability (or strength).
