张勇
,
覃作祥
,
许鸿吉
,
常凯
,
陆兴
,
佟维
中国腐蚀与防护学报
T4003 and Q450NQR1, as well as Nirosta 4003 and Q450NQR1 dissimilar metal joints were welded by ER-309 welding wire. The microstructure oftheir base metal and joint were analyzed by metallographic approach. The corrosion resistance of base metal and joints was evaluated by salt fog and electrochemical corrosion tests. The results demonstrated that as far as the similar metal joints of Nirosta 4003 and T4003 was concerned, the corrosion resistance of welding line was much better than that of base metal. However, the corrosion resistance of heat affected zone (HAZ) became worse. In the case of dissimilar metal joints of Nirosta 4003 and Q450NQR1, as well as T4003 and Q450NQR1, the corrosion resistance of welding line was reduced. Under salt spray condition, the corrosion resistance of welding line and base metal of similar metal joints was comparative. However, the dissimilar metal joints of Nirosta 4003 and Q450NQR1, as well as T4003 and Q450NQR1 exhibited obvious corrosion. Especially, abundant corrosion pits were found near the side of Q450NQR1. Due to the different corrosion voltages of stainless steel, weathering steel, HAZ, and welding line, a series of micro-batteries were formed in the dissimilar metal joints, which worsened the corrosion of weathering steel.
关键词:
铁素体不锈钢
,
weathering steel
,
dissimilar metal joint
,
corrosion resistance
刘国超董俊华韩恩厚柯伟
腐蚀科学与防护技术
用增重法、扫描电镜、X射线衍射、电子探针和X射线光电子能谱等手段研究了在模拟海洋大气干湿交替环境下16Mn钢和Cu-Mn耐候钢的腐蚀行为及Cu、Mn共添加对低合金钢腐蚀行为的影响.结果表明：Cu-Mn耐候钢的腐蚀速率低于16Mn钢，其锈层更致密；两种钢的铁锈均由Fe3O4，α-FeOOH，β-FeOOH，γ-FeOOH和大量无定形相组成；添加Cu使Fe3O4含量增加，添加Mn使γ-FeOOH含量减少；Cu在Cu-Mn耐候钢锈层中以CuFeO2存在；Mn在两种钢锈蚀初期以MnO存在，后期为Mn3O4.Cu、Mn的协同作用使Cu-Mn耐候钢抗大气腐蚀性能优于16Mn钢.
关键词:
干湿交替
,
weathering steel
,
XRD
,
EPMA
汪兵
,
刘清友
,
毛新平
,
翁宇
,
王向东
,
贾书君
,
董瀚
金属学报
采用EIS、SEM及XRD等方法研究了稀土钢、碳素钢在
0.3 mol/L NaCl溶液中的腐蚀行为. 结果
表明, 稀土能够提高碳素钢的耐蚀性能, 与碳素钢相比, 稀土钢在溶液中生成的锈层较为致密, 锈层中具有
保护性作用的α-FeOOH含量较高, 而活性的γ--FeOOH和β--FeOOH含量较少. 分析了
交流阻抗等效电路中电化学参数随时间的演变规律, 对稀土提高碳素钢的耐蚀性机理进行了讨论.
关键词:
稀土
,
weathering steel
,
electrochemical impedance spectroscopy
Ming ZHANG
金属学报(英文版)
In order to reveal evolution of the rust layer during atmospheric corrosion, commercial weathering steel (WS) 09CuPCrNi and a recently developed bainite WS were subjected to a salt fog test. The protection and compactness of the rust layer were evaluated by electrochemical analysis, absorption-desorption test, etc. The experimental results indicate that more compact rust layer could be derived from the rust particles with larger size. The well-established notion that the rust particle growth can induce the decrement of corrosion resistance of WS. However, the present investigation shows that the notion might not be universally accurate. The unusual result means that the rust particles might grow anisotropically during corrosion.
关键词:
Weathering steel
,
corrosion
,
rust particle
,
coarsening
王俊山
,
史培阳
,
刘凤莲
,
姜茂发
钢铁钒钛
doi:10.7513/j.issn.1004-7638.2013.06.021
针对铁路高强耐候钢的特点,通过调整钢中的镍含量,研究了试验钢耐大气腐蚀的变化规律,结果表明:在低铬和低镍条件下,试验钢表面基体与内锈层之间存在裂纹现象,随着钢中镍含量的增加,表面锈层厚度呈减薄的趋势,且致密性增加;在曝晒初期试验钢表面锈层结构以γ-FeOOH为主;随着曝晒时间的延长,表面锈层产物组成中不仅含有γ-FeOOH相,而且还出现了α-Fe00H相;而且随着镍含量的升高,试验钢表面锈层中α-FeOOH和γ-FeOOH比值逐渐增大.
关键词:
铁路用钢
,
耐候钢
,
大气腐蚀
,
镍
,
锈层结构
