Amorphous CR(80)B(20) and CR(60)B(40) Extremely High Corrosion Resistant Alloys
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
In general, some improvement in the corrosion resistance of a metal alloy system results if it can be made amorphous. It is not considered to be a major effect. We have found that the corrosion resistance of pure chrome can be improved by a factor of 35,000 (see table below) by the addition of small amounts of boron to make it amorphous. This improvement persists down to at least 40 atomic percent boron. If the Cr-B alloys are annealed into a microcrystalline state, we see similar high corrosion resistance. When annealed to the microcrystalline state, the Cr(80)B(20) (amorphous) becomes chrome with boron interstitials. This makes the corrosion resistance even more remarkable considering that we are merely going from pure crystalline chrome towards a slightly expanded chrome lattice with boron interstitials.