Final Report for the Study on S-Implanted Alloy 22 in 1 M NaCl Solutions

Windisch, Charles F. ; Baer, Donald R. ; Jones, R. H. ; Engelhard, Mark H.

Pacific Northwest National Laboratory (U.S.)

关键词: Corrosion;    X-Ray Photoelectron Spectroscopy Corrosion;    Alloys;    36 Materials Science;    Thickness;   

DOI  :  10.2172/968210
RP-ID  :  PNNL-15380
RP-ID  :  AC05-76RL01830
RP-ID  :  968210

美国|英语

来源: UNT Digital Library

【 摘 要 】

The objective of this study was to examine the effects of high levels of S in the near-surface region on the passivity of Alloy 22, a corrosion resistant Ni-Cr-Mo alloy, in deaerated 1 M NaCl solution. Near-surface concentrations of S up to 2 at.% were achieved in Alloy 22 test specimens by implanting them with S. The S-implanted samples were then evaluated in short-term electrochemical tests in the salt solution and subsequently analyzed with X-ray Photoelectron Spectroscopy (XPS) for film thickness and composition. Specimens tested included non-implanted and annealed Alloy 22 samples, samples implanted with S, and “blanks” implanted with Ar as an ion that would simulate the “damage” of S implantation without the chemical effect. A sample of S-implanted Alloy 22 was also exposed to solution for 29 days and analyzed for evidence of S accumulation at the surface over longer times.