scholarly journals Corrosion Behavior of TC4 Titanium Alloys in Al–Li Alloy Melt

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 794
Author(s):  
Fuyue Wang ◽  
Xiangjie Wang ◽  
Qiang Yan ◽  
Jianzhong Cui
Keyword(s):  
Titanium Alloy ◽  
Dissolution Rate ◽  
Corrosion Behavior ◽  
Reaction Layer ◽  
Diffusion Reaction ◽  
Lithium Content ◽  
Tc4 Titanium Alloy ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Li Content

The influences of Li content on the corrosion behavior of TC4 (Ti6Al4V) titanium alloy were explored when the TC4 titanium alloy was immersed in Al–Li alloy melt containing 0%, 1%, and 2% lithium at 680 °C, 700 °C, and 720 °C for 0.5 h, 1 h, and 2 h. The structure and growth law of the diffusion reaction layer at solid–liquid interface were studied, and the growth kinetic equation of the diffusion reaction layer was established. In addition, Ti content in Al–Li alloy melt was determined and its dissolution rate was calculated. The results showed that with the increase of lithium content in the melt, the thickness of the diffusion reaction layer (DRL) between TC4 titanium alloy and the melt increased significantly, and the activation energies of the diffusion reaction obtained were 141.28 kJ·mol−1 in liquid Al, 86.62 kJ·mol−1 in liquid Al–1Li alloy, and 43.42 kJ·mol−1 in liquid Al–2Li alloy, respectively. The dissolution rate of Ti in Al–Li alloy melts increased with the increase of lithium content in melts. When the holding time reached 3 h in a TC4 crucible, the content of Ti dissolved in the Al–2Li alloy melt was 0.105 wt%.

Effect of Anodic Films on Galvanic Corrosion Behavior of TC4 Titanium Alloy and LY12 Aluminum Alloy

2014 ◽  
Vol 998-999 ◽  
pp. 39-42
Author(s):  
Zhi Yong Wu ◽  
Xue Yuan Li ◽  
Li Ning Zhao ◽  
Su Rong Hu
Keyword(s):  
Titanium Alloy ◽  
Aluminum Alloy ◽  
Corrosion Behavior ◽  
Galvanic Corrosion ◽  
Anodic Film ◽  
Corrosion Mechanism ◽  
Anodic Films ◽  
Galvanic Current ◽  
Corrosion Morphology ◽  
Tc4 Titanium Alloy

Galvanic corrosion behavior of TC4 titanium alloy coupled LY12 aluminum alloy was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different oxidation films. Galvanic corrosion test was conducted on TC4 titanium alloy which coupled LY12-sulfuric acid anodic film (LY12/A(S)), LY12-chromic acid anodic film (LY12/A(Cr)), LY12-hard anodic film (LY12/A(S) hd) and bare LY12, respectively. Galvanic corrosion current (Ig) and average galvanic current density (Ig’) were monitored. Corrosion morphology was observed by camera and corrosion mechanism was discussed. The results show that the three anodic films improve the corrosion resistance of the anode in different magnitudes. LY12/A(S) hd is found to be least susceptible to galvanic corrosion when coupled TC4 titanium alloy. LY12/A(S) and LY12/A(Cr) are found to be moderately susceptible to galvanic corrosion. But the bare LY12 is highly susceptible to galvanic corrosion in corrosive environment.

Research on the Corrosion Behavior of TC4 Titanium Alloy by Scanning Kelvin Probe

2013 ◽  
Vol 774-776 ◽  
pp. 699-702
Author(s):  
Yun Long Ai ◽  
Li Liu ◽  
Wen He
Keyword(s):  
Titanium Alloy ◽  
Corrosion Behavior ◽  
Surface Potential ◽  
Alpha Phase ◽  
Kelvin Probe ◽  
Corrosion Morphology ◽  
Positive Direction ◽  
Equiaxed Structure ◽  
Tc4 Titanium Alloy ◽  
Scanning Kelvin Probe

The corrosion behavior and corrosion morphology of two typical TC4 titanium alloy with equiaxed structure and widmanstatten structure in hydrochloric acid solution were studied using scanning Kelvin probe techniques and observed by scanning electron microscope, respectively. The results show that along with the ongoing of corrosion, surface potential of equiaxed structure alloy is moving to positive direction and that of widmanstatten structure alloy is moving to negative direction after positive direction movement. The surface potential of two kinds structure alloy all present cathode and anode region in the corrosion process, which shows the characteristic of selective corrosion. Surface potential difference of widmanstatten structure alloy is greater than that of equiaxed structure alloy and its corrosion resistance is inferior to that of equiaxed structure alloy. Corrosion preferentially occurs in alpha phase of the two kinds structure alloy through corrosion morphology observation analysis.

scholarly journals Dynamic corrosion behavior of superhydrophobic surfaces

RSC Advances ◽  
2018 ◽  
Vol 8 (51) ◽  
pp. 29201-29209 ◽  
Author(s):  
C. Q. Li ◽  
M. Y. Zhu ◽  
J. F. Ou ◽  
Y. L. Lu ◽  
F. J. Wang ◽  
...  
Keyword(s):  
Thin Layer ◽  
Corrosion Behavior ◽  
Liquid Interface ◽  
Superhydrophobic Surfaces ◽  
Solid Liquid Interface ◽  
Solid Liquid

For superhydrophobic surfaces immersed in water, a thin layer of air could be entrapped in the solid/liquid interface.

Atom-probe analysis of the solid-liquid interface

1995 ◽  
Vol 53 ◽  
pp. 676-677
Author(s):  
J.A. Panitz
Keyword(s):  
Molecular Level ◽  
Selective Adsorption ◽  
Electronic Devices ◽  
Atom Probe ◽  
Chemical Agent ◽  
Hostile Environment ◽  
Solid Interface ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Chemically Selective

The first few atomic layers of a solid can form a barrier between its interior and an often hostile environment. Although adsorption at the vacuum-solid interface has been studied in great detail, little is known about adsorption at the liquid-solid interface. Adsorption at a liquid-solid interface is of intrinsic interest, and is of technological importance because it provides a way to coat a surface with monolayer or multilayer structures. A pinhole free monolayer (with a reasonable dielectric constant) could lead to the development of nanoscale capacitors with unique characteristics and lithographic resists that surpass the resolution of their conventional counterparts. Chemically selective adsorption is of particular interest because it can be used to passivate a surface from external modification or change the wear and the lubrication properties of a surface to reflect new and useful properties. Immunochemical adsorption could be used to fabricate novel molecular electronic devices or to construct small, “smart”, unobtrusive sensors with the potential to detect a wide variety of preselected species at the molecular level. These might include a particular carcinogen in the environment, a specific type of explosive, a chemical agent, a virus, or even a tumor in the human body.

The role of (bio)surfactant sorption in promoting the bioavailability of nutrients localized at the solid-water interface

1999 ◽  
Vol 39 (7) ◽  
pp. 91-98 ◽  
Author(s):  
Ryan N. Jordan ◽  
Eric P. Nichols ◽  
Alfred B. Cunningham
Keyword(s):  
Mass Transfer ◽  
Cell Membrane ◽  
Substrate Concentration ◽  
Water Interface ◽  
Industrial Systems ◽  
Solid Liquid Interface ◽  
Solid Liquid ◽  
Surfactant Sorption

Bioavailability is herein defined as the accessibility of a substrate by a microorganism. Further, bioavailability is governed by (1) the substrate concentration that the cell membrane “sees,” (i.e., the “directly bioavailable” pool) as well as (2) the rate of mass transfer from potentially bioavailable (e.g., nonaqueous) phases to the directly bioavailable (e.g., aqueous) phase. Mechanisms by which sorbed (bio)surfactants influence these two processes are discussed. We propose the hypothesis that the sorption of (bio)surfactants at the solid-liquid interface is partially responsible for the increased bioavailability of surface-bound nutrients, and offer this as a basis for suggesting the development of engineered in-situ bioremediation technologies that take advantage of low (bio)surfactant concentrations. In addition, other industrial systems where bioavailability phenomena should be considered are addressed.

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