Abstract：The nitrogen-alloying hardfacing alloy of martensite stainless steel was made through the addition of nitrogen alloy and the nitrogen-fixing elements of niobium, vanadium and titanium. The corrosion resistance of hardfacing alloy was investigated through electrochemical corrosion and chemical erosion tests. The results show that nitrogen-alloying of hardfacing alloy inhibits the precipitation of chromium carbides and the chemical stability of passivating film is effectively strengthened, the corrosion potential increases from -345mV to -264mV, and thus the electrochemical corrosion resistance of hardfacing alloy is strengthened.Owing to the uniform and fine microstructure of nitrogen-alloying hardfacing alloy, pits are fine and dispersed when pitting corrosion occurs on the hardfacing alloy in the FeCl3 solution, therefore the corrosion resistance of hardfacing alloy is improved by nitrogen alloying.
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