Corrosion Behaviour of Ultra-Fine Grain Chromium Bronze Prepared by Equal-Channel Angular Pressing in Nacl Solution

2011 ◽  
Vol 194-196 ◽  
pp. 554-557
Author(s):  
Ya Ni Zhang ◽  
Chang Zheng Xu ◽  
Mao Sheng Zheng ◽  
Jie Wu Zhu
Keyword(s):  
Equal Channel Angular Pressing ◽  
Corrosion Behaviour ◽  
Uniform Corrosion ◽  
Corrosion Morphology ◽  
Angular Pressing ◽  
Fine Grain ◽  
Immersion Experiment ◽  
Chromium Bronze ◽  
The Difference ◽  
Corrosion Pits

The corrosion resistance of Ultra-fine grain (UFG) chromium bronze, prepared by Equal-channel angular pressing (ECAP), was investigated at room temperature and atmospheric pressure by electrochemistry technique and immersion experiment. The electrochemistry experiment showed that ECAP processing don’t change the corrosion nature of chromiun bronze, the corrosion potential of UFG chromium bronze is a little more positive than that of CG chromium bronze, the differences are in the range of 10mV-20mV. Meantime, the immersion experiment showed that the UFG chromium bronze is more resistant to corrosion than its CG counterpart. The difference between UFG chromium bronze and its CG counterpart is also significant in terms of corrosion morphology. Though the structure is uniform corrosion, the microstructure is honeycomb-like morphology for CG chromium bronze and the corrosion pit is deeper. The shallower corrosion pits are displayed for UFG chromium bronze and grain drop off in local region.

Corrosion Behavior of Ultra-Fine Grain Chromium Bronze Prepared by Equal-Channel Angular Pressing in HCl Solution

2013 ◽  
Vol 662 ◽  
pp. 258-261
Author(s):  
Ya Ni Zhang ◽  
Tian Han Xu ◽  
Dang Hui Wang
Keyword(s):  
Corrosion Resistance ◽  
Equal Channel Angular Pressing ◽  
Corrosion Mechanism ◽  
Corrosion Morphology ◽  
Ecap Processing ◽  
Angular Pressing ◽  
Fine Grain ◽  
Immersion Experiment ◽  
Chromium Bronze ◽  
Hcl Solution

The corrosion resistance of Ultra-fine grain (UFG) chromium bronze, prepared by Equal-channel angular pressing (ECAP) processing, was investigated in HCl solution at room temperature and atmospheric pressure by electrochemistry technique and immersion experiment. The results shows that the corrosion potential of chromium bronze is decreased with ECAP processing. But the corrosion resistance is deteriorated slightly. According to the immersion tests, the weight-loss of UFG chromium bronze, compared with its counterpart, is higher in the initial stage and lower in the later stage, and the gap is in the range of 5%-15%. The corrosion mechanism on the UFG chromium bronze is deduced from the experiment data and corrosion morphology.

Effect of ECAP on the Electrochemical Behavior of Chromium Bronze

2011 ◽  
Vol 239-242 ◽  
pp. 98-101
Author(s):  
Ya Ni Zhang ◽  
Chang Zheng Xu ◽  
Mao Sheng Zheng ◽  
Jie Wu Zhu
Keyword(s):  
Electrochemical Behavior ◽  
Corrosion Potential ◽  
Nacl Solution ◽  
Angular Pressing ◽  
Fine Grain ◽  
Ecap Process ◽  
Electrode Cell ◽  
Cold Rolled ◽  
Chromium Bronze ◽  
The Difference

The effect of equal channel angular pressing (ECAP) process on the electrochemical behavior of chromium bronze in NaCl solution was investigated by three-electrode cell setup. The result shows the difference of electrochemical behavior between X plane and Y plane is still exist, and even in the unodd number passes for “route C” of ECAP process. ECAP process don’t change the corrosion nature of chromiun bronze, but the corrosion potential of 12 passes ultra-fine grain (UFG) chromium bronze is a little more positive than that of 0 pass chromium bronze. For better understanding the effect of ECAP on the electrochemical behavior of chromium bronze, we chose the cold-rolled materials with the same composition as reference materials. The result shows that ECAP process is more benefical to electrochemical behavior of chromium bronze than cold-rolled process. On the other hand, the result of EIS also shows that ECAP process is more benefical to form compacted corrosion layers on the surface of specimens.

Mechanical properties and corrosion behaviour of ultrafine-grained AA6082 produced by equal-channel angular pressing

2008 ◽  
Vol 43 (23-24) ◽  
pp. 7409-7417 ◽  
Author(s):  
Matthias Hockauf ◽  
Lothar W. Meyer ◽  
Daniela Nickel ◽  
Gert Alisch ◽  
Thomas Lampke ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Equal Channel Angular Pressing ◽  
Corrosion Behaviour ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
Mechanical Properties And Corrosion

Evaluation Grain Homogeneity of Aluminium after ECAP Process by ECAP Geometry Analysis Using Taguchi Method

2013 ◽  
Vol 594-595 ◽  
pp. 896-901
Author(s):  
Aminnudin ◽  
Pratiko ◽  
Anindito Purnowidodo ◽  
Yudy Surya Irawan ◽  
Shigeyuki Haruyama ◽  
...  
Keyword(s):  
Grain Size ◽  
Taguchi Method ◽  
Equal Channel Angular Pressing ◽  
Channel Angle ◽  
Angular Pressing ◽  
Fine Grain ◽  
Ecap Process ◽  
Fillet Radius ◽  
Geometry Analysis

Grain size and homogeneity are influence to aluminium properties, Equal channel angular pressing (ECAP) can produce aluminium with ultra fine grain Size (UFG). The grain size is depends on ECAP Dies geometry (Channel angle Φ, Fillet radius ψ) and friction, taguchi method used to find the optimum dies geometry its can produce smaller grain size and homogeny. Modeling done with channel angels 90, 105 and 120°, fillet radius (inside) 1.5, 5,0 and 10 mm ; fillet radius (outside) 1.5, 5,0 and 10 mm and friction 0, 0,025 and 0,05. Modeling used L9 taguchi matrix, the most homogeny dies is ECAP dies with channel angel 105°, fillet radius (inside) 10 mm ; fillet radius (outside) 0 mm and friction 0,025

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