硝酸级(NAG)310L不锈钢焊接接头在含Cr^(6+)的HNO_3溶液中的耐蚀性

CORROSION RESISTANCE OF WELDING JOINTS OF 310L(NAG) SS IN BOILING NITRIC ACID CONTAINING Cr^(6+) IONS

对硝酸级(NAG)310L不锈钢焊接接头在含氧化性离子的沸腾硝酸中进行浸泡实验及金相分析。研究表明,在不同Cr^(6+)含量的沸腾40%HNO_3中,材料的腐蚀程度主要受Cr^(6+)含量的影响。随Cr^(6+)含量的增加,母材和焊缝均出现不同程度腐蚀,但焊缝较母材腐蚀严重。Cr^(6+)含量是促进焊缝过钝化腐蚀和晶间腐蚀的主要因素。

Corrosion resistance of welding joints of 310L（NAG） stainless steel in boiling nitric acid with different Cr^（6＋） ions contents was investigated.It is shown that Cr^（6＋） ions can remarkably enhance corrosion attack on welding joints,and with intergranular attack in heat affected zone and weld metal.The weld metal was suffered more severely corrosion attack,but in pure boiling nitric acid,welding joints exhibit strong corrosion resistance.