Al含量对船用B级钢板耐海水腐蚀性能的影响  

Effect of Al content on seawater corrosion resistance of B steel plate for shipbuilding

作　　者：李健[1] 柴锋[1] 罗小兵[1] 周乃鹏 张峰[1] 李向阳 LI Jian;CHAI Feng;LUO Xiaobing;ZHOU Naipeng;ZHANG Feng;LI Xiangyang(Institute for Structural Steels,Central Iron and Steel Research Institute,Beijing 100081,China;China Iron and Steel Research Institute Group Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院工程用钢研究院,北京100081 [2]中国钢研科技集团有限公司,北京100081

出　　处：《钢铁研究学报》2023年第6期748-756,共9页Journal of Iron and Steel Research

摘　　要：对比研究了不同Al含量对船用B级钢耐海水腐蚀性能的影响规律,计算了其腐蚀失重,利用扫描电镜(SEM)和X射线衍射(XRD)方法分析了试验钢经模拟海水腐蚀后的锈层形貌与物相组成,并分析了试验钢的极化曲线和阻抗曲线。结果表明:在B级钢中添加Al有助于提升其耐海水腐蚀性能,试验钢经720 h腐蚀后,添加质量分数分别为0.5%和1%Al的试验钢腐蚀速率分别较对比钢降低了13.8%和27.6%。分析表明,含Al钢腐蚀后锈层与基体的结合更为紧密,内锈层厚度更大,Al的加入可以减小钢的腐蚀电流密度,其腐蚀产物中形成了具有阳离子选择性的FeAl_(2)O_(4),抑制了Cl-向金属基体侵入,提高了锈层的保护性。The effect of different Al content on the seawater corrosion resistance of grade B steel was comparatively studied by weight-loss measurement,scanning electron microscopy(SEM),X-ray diffraction(XRD),polarization curves and impedance curves analysis.The results show that the addition of Al to the B-grade steel helps to improve its seawater corrosion resistance,the corrosion rates of the test steels with 0.5 wt.%Al and 1 wt.%Al additions are 13.8%and 27.6%lower than the comparative steel after corrosion for 720 h.Compared with the comparative steel,the rust layer of Al-containing steel is more closely combined with the matrix after corrosion,and the thickness of the inner rust layer is larger.The addition of Al can reduce the self-corrosion current density.And FeAl_(2)O_(4)with cation selectivity is formed in the corrosion product,which inhibits the intrusion of Cl-into the metal matrix and improves the protection of the rust layer,thereby improving the seawater corrosion resistance of steel.

关 键 词：B级钢 海水腐蚀 AL元素 腐蚀行为 电化学特性 

分 类 号：TG172.5[金属学及工艺—金属表面处理]