Abstract
Laser processing is applied to crystalline surface alloys which are suitable for vitrification by conventional melt spinning and are bonded previously to a mild steel substrate. If amorphous surface alloys are processed, they passivate spontaneously in 1 N HCl at 30°C, and exhibit almost the same polarization curves as those of conventionally processed extremely corrosion-resistant amorphous counterparts. Among various alloys vitrification of a wide surface by the laser processing requires that the NiCrPB alloys contain 14–17 at. % chromium, 15–18 at. % phosphorus, 2–5 at. % boron and 19–20 at. % of the sum of phosphorus and boron. This composition range is quite narrow in comparison with that vitrifiable by conventional methods for the formation of the amorphous alloys such as melt spinning.
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