scholarly journals The Effect of Surface Pretreatment of Aluminum Alloy 7075-T6 on the Subsequent Inhibition by Cerium(III) Acetate in Chloride-Containing Solution

Author(s):  
Ingrid Milosev ◽  
Peter Rodic

Abstract The study aimed to investigate the effect of surface pretreatment on the corrosion protection of aluminum alloy 7075-T6 in sodium chloride solution using cerium acetate as a corrosion inhibitor. Different surface pretreatments were tested: (i) mechanical grinding, (ii) mechanical grinding and non-water diamond polishing, (iii) mechanical grinding, alkaline etching with NaOH and acid desmutting, and (iv) mechanical grinding, alkaline cleaning with a commercial SurTec cleaner and acid desmutting. Topography, composition, and morphology of inhibited surface during immersion were investigated using optical microscopy, 3-D profilometry, scanning electron microscopy/energy-dispersive X-ray analysis and Fourier transform infrared spectrometry. The corrosion properties were determined by potentiodynamic measurements and electrochemical impedance spectroscopy in sodium chloride solution without and with the addition of cerium acetate. A change in the composition and morphology of the inhibited surface was noticed as a function of surface pretreatment and immersion time. Appropriate surface treatment resulted in improved protection against localized corrosion even after long-term immersion up to 1 month. Among mechanical pretreatments, polishing gave better results than grinding. Among chemical pretreatments, alkaline cleaning in SurTec/HNO3 was more appropriate as a preceding step to acid desmutting than alkaline etching with NaOH.

1998 ◽  
Vol 47 (4) ◽  
pp. 254-259 ◽  
Author(s):  
Yasuyuki Takatani ◽  
Tsuyoshi Masugata ◽  
Kazuo Fujiwara ◽  
Koichi Shinkai ◽  
Koichi Hayashi

2004 ◽  
Vol 261-263 ◽  
pp. 1337-1342 ◽  
Author(s):  
Chun Yi Ruan ◽  
Hui Ji Shi

This paper applies subjective speckle method to investigate the effects of temperature and stress on the initial process of stress corrosion of an aluminum alloy 2024-T3. Considering the sensitivity of this observational method, the roughness of surface is used to represent the degree of corrosion. Stress corrosion experiments are carried out by displacement-controlled loading on specimens of Al2024-T3 in the thickness of 2 mm board in 3.5% sodium chloride solution. The solution is controlled at several temperature levels from 22°C to 80°C. The results of experiments show that: the rate of corrosion increases fast concomitance the increase of temperature when stress is constant; at the same temperature and the load range used, the effect of stress is not very evident on the rate of corrosion; the effect of temperature is higher on the rate of corrosion in the stress corrosion than that in general corrosion without stress.


1998 ◽  
Vol 47 (10) ◽  
pp. 661-667
Author(s):  
Tsuyoshi Masugata ◽  
Kazuo Fujiwara ◽  
Yasuyuki Takatani ◽  
Koichi Shinkai ◽  
Koichi Hayashit

2017 ◽  
Vol 69 (7) ◽  
pp. 870-880 ◽  
Author(s):  
Xingchen Xu ◽  
Daoxin Liu ◽  
Ni Ao ◽  
Xiaohua Zhang ◽  
Cao Chen ◽  
...  

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