Focusing on the relationship between the precipitated phases and the pitting corrosion of ZL101A aluminum alloy

2021 ◽  
Author(s):  
Chao Liu ◽  
Qinglin Li ◽  
Tianyi Zhang ◽  
Xiaoming Ding ◽  
Xiaorong Li ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Pitting Corrosion ◽  
Immersion Test ◽  
High Corrosion ◽  
Volta Potential ◽  
Two Phases ◽  
Corrosion Pits ◽  
Precipitated Phases ◽  
The Relationship

Abstract The pitting corrosion behavior of ZL101A aluminum alloy in simulated marine environment was investigated for guiding the composition design. The Volta potential of the precipitated phases was mainly characterized via the in-situ SKPFM technique. The obtained results indicated that the precipitated phases of ZL101A were composed of Al-Si phase, Si-Mg-Fe phase and Si-rich/Al-poor phase, accelerating the formation of corrosion pits during immersion test. Both Al-Si phase and Si-Mg-Fe phase accelerated the corrosion process through the self-dissolution and the galvanic effect, respectively, which can be contributed to the high corrosion sensitivity of the two phases. Si-rich/Al-poor phase presented high corrosion resistance, which should be related to the deficiency of impure elements such as Mg and Fe.

scholarly journals Effect of Laser Power on Microstructure and Micro-Galvanic Corrosion Behavior of a 6061-T6 Aluminum Alloy Welding Joints

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 3
Author(s):  
Huiling Zhou ◽  
Fanglian Fu ◽  
Zhixin Dai ◽  
Yanxin Qiao ◽  
Jian Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Laser Power ◽  
Galvanic Corrosion ◽  
Gas Metal Arc Welding ◽  
Immersion Test ◽  
Intermetallic Particles ◽  
Metal Arc Welding ◽  
Corrosion Behaviors ◽  
Welding Joints ◽  
Corrosion Pits

The 6061-T6 aluminum alloy welding joints were fabricated using gas metal arc welding (GMAW) of various laser powers, and the effect of laser power on the microstructure evolution of the welding joints was investigated. The corrosion behaviors of 6061-T6 aluminum alloy welding joints were investigated in 3.5 wt% NaCl solution using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The results showed that the micro-galvanic corrosion initiation from Mg2Si or around the intermetallic particles (Al-Fe-Si) is observed after the immersion test due to the inhomogeneous nature of the microstructure. The preferential dissolution of the Mg2Si and Al-Fe-Si is believed to be the possible cause of pitting corrosion. When the laser power reached 5 kW, the microstructure of the welded joint mainly consisted of Al-Fe-Si rather than the Mg2Si at 2 kW. The relatively higher content of Al-Fe-Si with increasing in laser power would increase the volume of corrosion pits.

Effect of Cr Content On Pitting Behavior of Fe-Cr Alloys

CORROSION ◽  
1966 ◽  
Vol 22 (4) ◽  
pp. 107-112 ◽  
Author(s):  
R. F. STEIGERWALD
Keyword(s):  
Mild Steel ◽  
Pitting Corrosion ◽  
Room Temperature ◽  
Chromium Content ◽  
Immersion Test ◽  
Applied Current ◽  
Polarization Measurements ◽  
Cr Content ◽  
The Relationship ◽  
Pit Initiation

Abstract Immersion and applied current studies are used to investigate the pitting behavior of binary Fe-Cr alloys formed both by conventional melting techniques and by diffusion of chromium into mild steel (chromizing). Experiments on both sets of materials show that a chromium content of 28–30 percent is critical for elimination of room-temperature pitting corrosion. It is proposed that chromium acts to improve the pitting resistance of Fe-Cr alloys by stabilizing passivity, thus reducing pit initiation and slowing pit growth. The relationship between polarization measurements and pitting is discussed. It is shown that in a simple immersion test pitting occurs at potentials quite different from the “critical” potentials predicted by polarization measurements.

Behavior of Heavy Plastic Deformation of Cu-15Cr-0.1Zr In Situ Composite

2009 ◽  
Vol 79-82 ◽  
pp. 2191-2194
Author(s):  
Yan Li ◽  
Xiao Hong Chen ◽  
Ping Liu ◽  
Lin Hua Gao ◽  
Bao Hong Tian
Keyword(s):  
Electron Microscopy ◽  
Plastic Deformation ◽  
Cold Drawing ◽  
Degree Of Deformation ◽  
Transmission Electron ◽  
Fibrous Morphology ◽  
Two Phases ◽  
Relationship Of ◽  
The Relationship

The behavior of plastic deformation of Cu-15Cr-0.1Zr in-situ composite under different degree of cold drawing deformation was analyzed by using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that both Cu and Cr phases are elongated along cold drawn direction and appear a fibrous morphology; However, Cu phase shows a thread-like fibrous morphology and Cr phase shows a band-like fibrous morphology. The two phases have a coherent relationship of (111)Cu //(011)Cr; When the degree of deformation(ε)is equal to 6.43, the relationship shows// [111]Cu // [110]Cr //cold drawn direction. Furthermore, forming two different morphologies of Cu and Cr phases during cold drawing is also analyzed.

In-Situ Monitoring of Pitting Corrosion in Aluminum Alloy 2024

CORROSION ◽  
1998 ◽  
Vol 54 (6) ◽  
pp. 451-458 ◽  
Author(s):  
C.-M. Liao ◽  
J. M. Olive ◽  
M. Gao ◽  
R. P. Wei
Keyword(s):  
Aluminum Alloy ◽  
Pitting Corrosion ◽  
In Situ Monitoring ◽  
Aluminum Alloy 2024

The Relationship of High Strength Aluminum Alloy Corrosion Behavior and Corrosion Environment

2014 ◽  
Vol 904 ◽  
pp. 86-89
Author(s):  
Song Zhou ◽  
Li Hui ◽  
Liang Xu ◽  
Yu Tong Guo ◽  
Shao Hua Ma
Keyword(s):  
Aluminum Alloy ◽  
High Strength ◽  
Corrosion Damage ◽  
Fuel Tank ◽  
Nacl Solution ◽  
Surface Corrosion ◽  
Corrosion Pit ◽  
Corrosion Pits ◽  
Relationship Of ◽  
The Relationship

The aim of this article is to research the characteristics of corrosion pit on 2xxx aluminum alloys in different environments (3.5wt% NaCl solution, water in fuel tank and wet air). Measure the area of corrosion pit, the depth of corrosion pit in different environments. The results show that in 3.5wt% NaCl solution: the initiation of surface corrosion pits mainly occur in 24h, with time increasing ,the depth of corrosion pit rises indistinctively; in water in fuel tank : during 24h-120h, with the extension of corrosion time, the maximum depth of corrosion pits changed a little, the maximum corrosion area became a little smaller than that in 3.5wt% NaCl solution; in wet air: the corrosion damage was smaller than that in 3.5wt% NaCl solution and water in fuel tank, the depth of the corrosion pit was about 20μm, the biggest size of corrosion pit area was about 0.5 x104μm2.

Profile Imaging of Silicon Surface Reconstructions

1985 ◽  
Vol 43 ◽  
pp. 262-263
Author(s):  
O.L. Krivanek ◽  
G.J. Wood
Keyword(s):  
Electron Microscopy ◽  
Surface Structure ◽  
Structure Determination ◽  
Silicon Surface ◽  
Good Resolution ◽  
Surface Reconstructions ◽  
Bulk Structure ◽  
Point To Point ◽  
The Relationship

Electron microscopy at 0.2nm point-to-point resolution, 10-10 torr specimei region vacuum and facilities for in-situ specimen cleaning presents intere; ing possibilities for surface structure determination. Three methods for examining the surfaces are available: reflection (REM), transmission (TEM) and profile imaging. Profile imaging is particularly useful because it giv good resolution perpendicular as well as parallel to the surface, and can therefore be used to determine the relationship between the surface and the bulk structure.

A combined ultrastructural and gene molecular research for the relationship between human uterine cervical carcinoma and human papillomavirus

1990 ◽  
Vol 48 (3) ◽  
pp. 204-205
Author(s):  
Kun Lee ◽  
Jingyi Si ◽  
Ricai Han ◽  
Wei Zhang ◽  
Bingbing Tan ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Human Papillomavirus ◽  
Intraepithelial Neoplasia ◽  
Hpv Infection ◽  
Dot Blot ◽  
Homologous Sequences ◽  
Normal Cervical Epithelium ◽  
The Relationship ◽  
Chronic Cervicitis

There are more supports for the view that human papillomavirus (HPV) infection might be an etiological factor in the development of cervical cancer when the association of persistent condylomata is considered. Biopsies from 318 cases with squamous cell carcinoma of uterine cervix, 48 with cervical and vulvar condylomata, 14 with cervical intraepithelial neoplasia (CIN), 34 with chronic cervicitis and 24 normal cervical epithelium were collected from 5 geographic regions of China with different cervical cancer mortalities. All specimens were prepared for Dot blot, Southern blot and in situ DNA-DNA hybridizations by using HPV-11, 16, 18 DNA labelled with 32P and 3H as probes to detect viral homologous sequences in samples. Among them, 32 cases with cervical cancer, 27 with condyloma and 10 normal cervical epitheliums were randomly chosen for comparative EM observation. The results showed that: 1), 192 out of 318 (60.4%) cases of cervical cancer were positive for HPV-16 DNA probe (Table I)

BRIDGEPORT 54

Alloy Digest ◽  
1964 ◽  
Vol 13 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Physical Properties ◽  
Tensile Properties ◽  
Erosion Resistance ◽  
Heat Treating ◽  
Good Strength ◽  
High Corrosion ◽  
Copper Zinc ◽  
Strength And Ductility

Abstract Bridgeport 54 is a copper-zinc-aluminum alloy having high corrosion and erosion resistance combined with good strength and ductility. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as heat treating and machining. Filing Code: Cu-141. Producer or source: Bridgeport Brass Company.

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