【摘要】 本文用慢应变速率实验（ＳＳＲＴ）方法研究了奥氏体３０４不锈钢焊接接头在室温ＨＣｌ＋ＮａＣｌ溶液中应力腐蚀开裂（ＳＣＣ）敏感性Ｈ＋浓度和Ｃｌ－浓度是影响该体系发生ＳＣＣ的两个重要因素，Ｈ＋浓度的改变可使材料的腐蚀形态发生变化，对ＳＣＣ敏感的酸度范围为：５．０ｘ１０－４～３０ＭＨ＋，并给出体系“３０４不锈钢焊缝／ＨＣｌ＋ＮａＣｌ”的应力腐蚀状态图（［Ｃｌ－］－［Ｈ＋］－ＳＣＣ图）焊缝区是焊接接头的ＳＣＣ敏感区，应力腐蚀裂纹是沿着被选择性溶解的奥氏体枝晶间的δ－铁素体扩展的，断口具有奥氏体枝晶骨架的形貌．该体系发生的是活化态下的应力腐蚀．更多还原

【Abstract】 Weldment of type 304 stainless steel is susceptible to stress corrosion cracking (SCC) in acidicchloride solutions at ambient temperature. H+ and Cl- ions are important in causing SCC and changing thetype of corrosion. The acidity range susceptible to SCC is 5.0×10-4-3.0MH+. The diagram of[Cl-]-[H+]-SCC for system″304 stainless steel weldment / HCl+NaCl″is measured by SSRT method. Theelectrochemical character of 304 stainless steel weldments in- acidic chloride solutions is in active corrosionstate when SCC occurs. Weld fusion zone is a sensitive part in weldments for the occurance of SCC. Stresscorrosion cracks propagate along the active path (delth-ferrite) due to its selective dissolution. Austeniticdendritic skeletons are observed in the fracture morphology by SEM.更多还原