EFFECT OF SEVERAL SULFUR CONTAINING ANIONS ON PITTING OF MILD STEEL
含S阴离子对低碳钢孔蚀的影响

The influence of several sulfur containing anions,including SO 2- 4,SO 2- 3,S 2O 2- 3,CNS -and S 2- ions,on pitting corrosion of mild steel in 0.1 mol/L NaNO 2+0.05 mol/L NaCl solution was studied using potentiodynamic polarization method.It was observed that CNS -,SO 2- 3,SO 2- 4 and S 2O 2- 3 ions promote nucleation of pitting,and S 2- retard nucleation. S 2- . S 2O 2- 3 and SO 2- 3 ions facilitate the growth of pits,while SO 2- 4 retard the growth.The relevant mechanisms of the infltuence of anions on pitting was also discussed.