结构稳定性对Zr基非晶合金电化学腐蚀性能的影响  

Effect of Structural Stability on Electrochemical Corrosion Properties of Zr-based Amorphous Alloy

作　　者：阎竹 张晨阳 王立新 袁国 张元祥 方烽 王洋 康健 YAN Zhu;ZHANG Chenyang;WANG Lixin;YUAN Guo;ZHANG Yuanxiang;FANG Feng;WANG Yang;KANG Jian(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819

出　　处：《中国腐蚀与防护学报》2022年第1期79-84,共6页Journal of Chinese Society For Corrosion and Protection

基　　金：基本科研业务费重大科技创新项目(N170708019)。

摘　　要：使用双辊法制备了高能态、高自由体积含量的Zr_(55)Cu_(30)Al_(10)Ni_(5)非晶合金,研究了结构稳定性对非晶合金在3.5%(质量分数)NaCl溶液中电化学性能的影响。结果表明,退火试样较铸态试样自由体积减小,动电位极化实验中均出现点蚀。在653 K(低于T_(g))真空退火30 min的试样电化学腐蚀后表面点蚀坑尺寸和数量减少。在693和723 K(介于T_(g)和T_(x)之间)退火的试样腐蚀后点蚀坑尺寸变小,数量增加,非晶中形成的纳米晶使点蚀敏感性增加,基体中自由体积减小阻碍点蚀坑进一步传播。研究表明,双辊法制备的高能态的、自由体积含量多的非晶合金铸带易被腐蚀,在结晶温度以下退火,可以减少其自由体积含量,有利于其腐蚀性能的提高。Zr_(55)Cu_(30)Al_(10)Ni_(5) amorphous alloy with high energy state and high free volume content was prepared by twin-roll rolling method.Then the effect of structural stability on the electrochemical properties of the prepared amorphous alloy in 3.5%(mass fraction)NaCl solution was studied.The results show that the free volume of the annealed alloy is smaller than that of the as-cast one,while the former one suffered from pitting corrosion during the potentiodynamic polarization test.The size and number of the electrochemical corrosion test induced corrosion pits are reduced on the surface of the alloy annealed in vacuum at 653 K(lower than T_(g))for 30 min.The size of corrosion pits become smaller and the number of pits increases for the alloy annealed at 693 and 723 K(between T_(g) and T_(x))respectively.The nano-crystallites formed in the amorphous alloy may increase its pitting sensitivity,the decrease of free volume in the matrix may hinder the further propagation of corrosion pits.This study shows that the amorphous alloy strip with high energy and high free volume content prepared by Twin-roll rolling method is prone to suffer from corrosion,whereas,the annealing below the crystallization temperature can reduce its free volume content and thus improve its corrosion performance.

关 键 词：ZR基非晶 退火 结构弛豫 纳米晶 电化学性能 

分 类 号：TG174[金属学及工艺—金属表面处理]