MHB4新型合金抗蚀性能研究

Corrosion resistant properties for a new alloy MHB4

用中频感应炉熔炼了新型超低碳高合金奥氏体不锈钢MHB4和 316L不锈钢 ,研究了它们在不同介质中的抗腐蚀性能 .结果表明 ,由于MHB4增加了Cr、Ni和Mo的含量 ,并加入W ,极大地提高了抵抗Cl-离子引起的点蚀能力 ,因此MHB4的耐点蚀、耐缝隙腐蚀以及在合成海水中的抗蚀性均优于 316L不锈钢 .

New austenitic stainless steel with low carbon MHB4 and 316L stainless steel were prepared by medium frequency induction furnace. The corrosion resistant properties of these stainless steels, which were subjected to different corrosive medium, were investigated. Experimental results showed that corrosion resistant pitting, corrosion resistant slitting and corrosion resistant behaviors in synthesized sea water of MHB4 are much better than those of 316L stainless steel. The improvements of the corrosion resistant properties of MHB4 can be attribute to an increase of the Cr, Ni, Mo and W elements, which are most helpful to improve corrosion resistant pitting caused by chlorine ion.