Surface and Corrosion Study of Laser-processed Zirconium Alloys.
Rawers-J; Reitz-W; Bullard-S; Roub-EK
Corrosion 1991 Oct; 47(10):769-777
Reactor-grade zirconium (zircaloy-2) was laser-glazed and laser- alloyed with nickel (ni) or chromium (cr) powders in this U.S. Bureau of Mines study. Laser alloying produced a surface that was macroscopically, chemically homogeneous. However, at the microscopic level the melt zone was a mixture of microcrystalline pure zirconium (zr) and extremely fine grain, or possibly amorphous, solid solution regions of zr and alloying elements. Corrosion tests (potentiodynamic and long-term immersion) were conducted in 10 pct fecl3 solution. The potentiodynamic tests showed icorr and ecorr were a strong function of surface conditioning, altered by grit- blasting, laser processing, acid cleaning, and heat treating. Significant improvement was achieved in corrosion resistance by laser glazing and laser alloying.
Corrosion, V. 47, No. 10, Oct. 1991, PP. 769-777