The corrosion behavior of amorphous nickel base alloys in a hot concentrated phosphoric acid |
| |
| Affiliation: | 1. School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;2. School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou 730050, China;3. School of Electronics Science and Engineering, Faculty of Electronic and Information Engineering, Xi''an Jiaotong University, Xi''an 710049, China |
| |
| Abstract: | The corrosion behavior of more than 50 melt-spun alloys was examined in an 87 wt% H3PO4 solution at 433 K. Ni-(30–50)Ta alloys possess the highest corrosion resistance due to the formation of a hydrated tantalum(V) oxyhydroxide film containing a small amount of phosphate. Corrosion rates of Ni-(1–10)Ta-P, Ni-(15–20)Cr-P and Ni-(10–20)Mo-P alloys are comparable to that of crystalline tantalum metal. The corrosion resistance of the former two alloy families is based on the formation of tantalum(V) phosphate and chromium(III) phosphate, respectively. The surface film on the Ni-Mo-P alloys consists of molybdenum(VI) and Ni(II) oxyhydroxides and phosphates, and nickel oxyhydroxide seems more protective than molybdenum oxyhydroxide. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
