Evolution of the Corrosion Product Film on Nickel-Aluminum Bronze and Its Corrosion Behavior in 3.5 wt % NaCl Solution
Evolution of the Corrosion Product Film on Nickel-Aluminum Bronze and Its Corrosion Behavior in 3.5 wt % NaCl Solution
复制标题
Evolution%20of%20the%20Corrosion%20Product%20Film%20on%20Nickel-Aluminum%20Bronze%20and%20Its%20Corrosion%20Behavior%20in%203.5%20wt%20%%20NaCl%20Solution
DOI：
10.3390/ma12020209
复制
发表时间：
2019-01-02
期刊：
影响因子：
3.4
通讯作者：
Lu, Weijie
中科院分区：
文献类型：
--
作者：
Ding, Yang;Zhao, Rong;Lu, Weijie
镍铝青铜腐蚀产物膜的原位研究对解释其耐蚀机理具有重要意义。本文系统地研究了镍铝青铜在3.5 wt % NaCl溶液中的腐蚀行为和保护膜的形成过程。扫描电镜分析和电化学试验结果表明，腐蚀产物膜的形成提高了镍铝青铜的耐蚀性。采用原位扫描振动电极技术对腐蚀产物膜在浸泡时间内局部电化学性能的变化进行了评价，实时揭示了离子通量的演变规律。采用原位原子力显微镜直接观察了镍铝青铜不同相保护膜的形成过程。不同位置的α相表现出不同的腐蚀行为，α + κIII共析结构中的片层α相受到更严重的腐蚀攻击。κ相在短时间内形成稳定致密的保护膜，有效防止腐蚀侵袭。然而，β′相受到最严重的腐蚀破坏，直到150min后形成保护膜。
The in-situ studies of the corrosion product film on nickel-aluminum bronze are significant for explaining the mechanism of its corrosion resistance. In this paper, the corrosion behavior of nickel-aluminum bronze and the formation process of the protective film in 3.5 wt % NaCl solution are systematically investigated. The results of scanning electron microscope analysis and electrochemical tests indicate that the corrosion resistance of nickel-aluminum bronze is improved due to the formation of the corrosion product film. The change of local electrochemical property on the corrosion product film during the immersion time is evaluated via in-situ scanning vibrating electrode technique, and it reveals the evolution rules of ionic flux in real time. The formation process of the protective film on different phases in nickel-aluminum bronze is observed directly by in-situ atomic force microscopy as height change measurements. The α phases at different locations present different corrosion behaviors, and the lamellar α phase within the α + κIII eutectoid structure gets more serious corrosion attack. The κ phases establish a stable and dense protective film in short time, preventing the corrosion attack effectively. The β′ phase, however, suffers the most serious corrosion damage until a protective film is formed after 150 min of immersion.