含S阴离子对低碳钢孔蚀的影响

EFFECT OF SEVERAL SULFUR CONTAINING ANIONS ON PITTING OF MILD STEEL

用电化学极化法研究了SO2 -4 ,SO2 -3 ,S2 O2 -3 ,CNS-和S2 -5种含S阴离子对低碳钢在 0 .1mol/LNaNO2 +0 0 5mol/LNaCl溶液中的孔蚀行为的影响 .CNS-,SO2 -3 ,SO2 -4 和S2 O2 -3 离子促进碳钢孔蚀形核 ,影响大小顺序为S2 O2 -3 >SO2 -4 >SO2 -3 >CNS-;S2 -离子则抑制孔蚀形核 .S2 -,S2 O2 -3 和SO2 -3 离子促进小孔生长 ;而SO2 -4 抑制小孔生长 .CNS-离子对小孔生长的作用不明显 .将各种含S阴离子对孔蚀形核和生长影响作用的大小进行了比较 。

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.