Corrosion behaviour of Softmagnetic iron-nickel alloys

✍ Scribed by B. Gehrmann; Dr. H. Hattendorf; Dr. A. Kolb-Telieps; W. Kramer; W. Mottgen

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: German
• Weight: 693 KB
• Volume: 48
• Category: Article
• ISSN: 0947-5117
• DOI: 10.1002/maco.19970480809

✦ Synopsis

Abstract

The corrosion behaviour of different FeNi alloys containing between 35 and 82 wt% nickel has been investigated in a humidity test between room temperature and 80°C. It has been found that higher nickel contents improve the corrosion behaviour. The poor corrosion behaviour of the low nickel containing alloys can be improved by grinding and cleaning the surface. With approximately 40 wt% nickel and 8 wt% chromium a softmagnetic alloy has been found with a corrosion behaviour similar to a high nickel alloy with approximately 80 wt% nickel. This FeNiCr alloy achieves also approximately the same saturation induction of 0.75 T as the 80 wt% nickel containing Fe‐Ni‐Mo alloy. The sufficient low coercive force of less than 2.5 A/m after an appropriate heat treatment and the adequate corrosion behaviour make this alloy suitable as a material for stamped parts in electromagnetic relays.