科研之友
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摘要
En this paper, Ni-Cr-Mo-Nb multi-element surface alloying has been investigated on a substrate of three kinds of industrial steels (industrial pure iron, low carbon steel and 304 stainless steel) by means of the double glow plasma surface alloying technique. The results showed that highly alloyed nickel-based surface alloying layers were formed on the surface of the three kinds of steels. The alloying layer was uniform, continuous and compact. The alloying layers consisted of a gamma phase or gamma matrix with several precipitates (P or Laves phase, and NbC carbide, etc.). A method of eliminating these precipitates has also been discussed. The corrosion resistance of the nickel-based surface alloying layer was investigated by an electrochemical method in a 3.5% NaCl and 5% HCl solution, and 200-h exposure tests in a 20% H2SO4 and 20% HCl solution. The corrosion resistance of surface alloying layer formed on stainless steel substrate was better than that of the nickel-based alloy Inconel 625 and 304 stainless steel. The experimental results indicated that this is an effective way to obtain a high quality corrosion resisting surface alloying layer on the surfaces of steels using the double glow plasma surface alloying technique.
