Effects of P addition on corrosion properties of soft magnetic FeSiB alloys

Abstract

Electrochemical behavior of Fe76Si9B 15-xPx alloy (x = 0, 2, 5, 7, 10) ribbons in borate buffer solution of pH 8.45 had been investigated. The as-spun ribbons had an amorphous structure. The lower current densities of P-added FeSiBP ribbons with native oxide films were observed at low applied potentials. The minimum P concentration for enhancing the corrosion properties was estimated to be 5 to 7 at%. The current densities of the FeSiBP ribbons after removal of the oxide films were suppressed to lower levels in comparison with that of Fe76Si 9B15 ribbons. The formation of a phosphate-containing layer helps passivating the ribbons due to the low solubility of iron phosphate compounds. © 2013 The Japan Institute of Light Metals.