(Zr0.55Cu0.3Al0.1Ni0.05)98Er2非晶合金制备及其晶化动力学行为

为了研究SAF2507双相不锈钢（SAF2507 DSS）螺旋桨叶片在含硫酸盐还原菌( SRB)和铁氧化菌(IOB)海水中的耐腐蚀性能，提出一种二次急冷淬火成形技术来成形SAF2507 DSS螺旋桨叶片。同时根据螺旋桨叶片在不同二次急冷淬火成形温度下析出相的类型和析出规律，研究螺旋桨叶片在含SRB和IOB海水中的腐蚀性能。结果表明，当二次急冷淬火成形温度在700℃时，螺旋桨叶片表面析出少量的χ相；达到850℃时，χ相停止析出并完全转化成σ相，析出的σ相达到最大值；超过850℃时，析出的σ相开始急剧减少，到950℃时仅有少量的σ相析出。螺旋桨叶片在不同二次急冷淬火成形温度下，腐蚀电流密度、交流阻抗等电化学性能变化规律与螺旋桨叶片表层χ相和σ相的析出规律、以及χ相和σ相自身的耐腐蚀特征相吻合。二次急冷淬火成形温度在750℃-1050℃之间，螺旋桨叶片的耐腐蚀性能随热成形温度的升高呈增强—降低—增强规律变化，850℃时螺旋桨叶片的耐腐蚀性能最差。螺旋桨叶片二次急冷淬火成形后富Fe的表面特征，在SRB+IOB的作用下，螺旋桨叶片表面钝化膜被破坏，导致耐腐蚀性能降低。

Ding Ruixian1,2, Kou Shengzhong1,2, Li Xiaocheng1,2, Fan Jianjun1,2, Fu Xiaoqiang1,2,Jiang Xilai1,2, Li Chunling3,Li Chunyan1,2

The (Zr0.55Cu0.3Al0.1Ni0.05)98Er2 amorphous alloy bars with diameter of 6 mm were prepared by copper mold suction casting method. The effects of isothermal temperature and time on the thermal stability in supercooled liquid region were investigated, and the crystallization kinetics behavior was studied by continuous heating and isothermal heating.The results show that with the increase of isothermal heat treatment temperature, the isothermal heat treatment time of (Zr0.55Cu0.3Al0.1Ni0.05)98Er2 amorphous alloy is shorter; According to Kissinger equation, the activation energy Ex of the amorphous alloy is 337.39 kJ/mol; The experimental data obtained by the two methods are very close, which can be proved by each other.