Corrosion product film formed on the 90/10 copper–nickel tube in natural seawater: Composition/structure and formation mechanism

2015 ◽  
Vol 91 ◽  
pp. 245-261 ◽  
Author(s):  
A.L. Ma ◽  
S.L. Jiang ◽  
Y.G. Zheng ◽  
W. Ke
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yanbo Zhu ◽  
Xiaohong Chen ◽  
Ping Liu ◽  
Shaoli Fu ◽  
Honglei Zhou ◽  
...  

Purpose This study aims to investigate the effect of changes in iron content in 70/30 copper–nickel alloy on the corrosion process. Design/methodology/approach 70Copper–30Nickel-xFe-1Mn (x = 0.4,0.6,0.8,1.0 Wt.%) alloy were prepared by the high frequency induction melting furnace. The scanning electron microscope, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy were used to analyze the morphology and component of the corrosion product film. Findings The results show that the corrosion resistance of 70/30 copper–nickel alloy added with 1.0%Fe is the best, and the film is divided into inner dense Cu2O composite film and outer hydration loose layer; XRD showed that after adding 1.0% Fe, the content of Cu2(OH)3Cl in the corrosion product film was significantly reduced, while the content of Cu2O remained unchanged; XPS showed that nickel accumulates in the inner layer of corrosion product film; the stage growth mode of the film, the role of nickel in it and the enrichment mechanism of iron in the inner film were summarized and discussed. Originality/value The changes in the composition and structure of the corrosion product film caused by the iron content are revealed, and the mechanism of the difference in corrosion resistance is discussed.


RSC Advances ◽  
2015 ◽  
Vol 5 (41) ◽  
pp. 32479-32490 ◽  
Author(s):  
Qingyang Li ◽  
Zhongbao Feng ◽  
Lihua Liu ◽  
Hong Xu ◽  
Wang Ge ◽  
...  

A hydrophobic protective corrosion product film (NC-1) with a nano-wire structure is formed on the surface of a nanocrystalline zinc coating.


Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1227
Author(s):  
Xu Zhao ◽  
Yuhong Qi ◽  
Jintao Wang ◽  
Tianxiang Peng ◽  
Zhanping Zhang ◽  
...  

To study the effect of weld and defects on the corrosion behavior of nickel aluminum bronze (UNS C95810) in 3.5% NaCl solution, the weight loss, X-ray diffraction, optical microscope, scanning electron microscope and electrochemical test of the specimen with weld and defects were investigated. The results show that the presence of weld and defects increases the corrosion rate of bronze. Weld does not change the structure of the corrosion product film, but defects induce a lack of the protective outermost corrosion product in bronze. Weld makes the corrosion product film in the early stage more porous. Defects always produce an increase in the dissolution rate of the bronze.


Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 209 ◽  
Author(s):  
Yang Ding ◽  
Rong Zhao ◽  
Zhenbo Qin ◽  
Zhong Wu ◽  
Liqiang Wang ◽  
...  

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.


2014 ◽  
Vol 39 (25) ◽  
pp. 13919-13925 ◽  
Author(s):  
Shuqi Zheng ◽  
Chengshuang Zhou ◽  
Xingyang Chen ◽  
Lin Zhang ◽  
Jinyang Zheng ◽  
...  

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