LASER GLAZING OF Ni-Nb AND Ni-Nb-Cr ALLOYS AND CORROSION RESISTANCE OF AMORPHOUS LAYERS

摘要

Partially amorphous Ni-Nb alloy was made by 1.91 kW cw CO₂ laser melt-quenching,and fully amorphous by 4.5 kW and 4.9 kW.The corrosion resistance of the amor-phous layer was improved by adding Cr.Potentiodynamic polarization curves showthat the amorphous Ni₅₀Nb₄₀Cr₁₀ is in more corrosion-resistant than the amorphousNi₆₀Nb₄₀and 18-8 stainless steel.