Pitting Corrosion Resistance of 316LN Stainless Steel in Chlorine-containing Aqueous Solution
In view of the current situation that the influence of N element on the pitting corrosion resistance of austenitic stainless steel and its mechanism are not clear,the mechanical properties and electrochemical impedance spectroscopy of nitrogen controlled stainless steel 316LN are tested.The results showed that the mechanical properties and corrosion resistance of 316LN at room temperature were superior to those of 316L stainless steel,but the corrosion resistance of 316LN stainless steel was degraded significantly with the increasing of temperature and medium concentration.At room temperature and low concentration of chloride ion,the impedance of the passivation film on 316LN stainless steel is higher than that of 316L stainless steel,which indicated that the stability of the passivation film on 316LN stainless steel is higher than that of 316L stainless steel under the synergistic effect among N,Cr and Mo.Meanwhile,the conversion products of NH4+or NO3-from N element can effectively inhibit the formation of secondary corrosion pits in 316LN stainless steel and avoid rapid propagation of corrosion pits in depth.
国家科技期刊平台
NSTL
万方数据
