锆脱氧对船板EH36夹杂物和耐蚀性能的影响

为研究脱氧方式对船板夹杂物形态和耐蚀性能的影响,采用锆脱氧和铝脱氧,对比两种脱氧条件下钢板晶粒尺寸、夹杂物形态和耐腐蚀性能。结果表明,锆脱氧试验钢夹杂物主要为钙铝酸盐夹杂、球形复合氧化物;其中,大颗粒和长条状MnS夹杂物的密度较低,夹杂物弥散细小,可以阻止晶界迁移带来的晶粒长大,有效细化钢板晶粒尺寸。锆脱氧形成的钢中细小氧化物可以作为MnS异质形核核心,降低了钢基体MnS夹杂微区电化学腐蚀敏感性与扩展速度;这种复合氧化物电化学稳定性好,与铝脱氧方式相比,可以有效提升钢板耐蚀性能。

Effect of zirconium deoxidation on inclusions and corrosion resistance for high strength ship plate EH36

In order to study the effect of deoxidation mode on inclusion morphology and corrosion resistance for ship plate, the grain size, inclusion morphology and corrosion resistance of steel plate were compared under zirconium deoxidation and aluminum deoxidation. The results show that the inclusions in zirconium deoxidizing test steel are mainly calcium aluminate inclusions and spherical composite oxides.The density of zirconium deoxidation large particles and long strip MnS inclusions is less, and the dispersion of inclusions is fine, which can prevent the grain growth caused by grain boundary migration and effectively refine the grain size of steel plate. The fine oxide in the steel formed by zirconium deoxidation can be used as the heterogeneous nucleation core of MnS, which reduces the electrochemical corrosion sensitivity and expansion speed of MnS inclusion micro area in the steel matrix. Compared with aluminum deoxidation, the composite oxide has good electrochemical stability and significantly improves the corrosion resistance of the steel plate.