The Dependence of the Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to HCL Solution on the 4Cr/ (2Mo+Cu)

2011 ◽  
Vol 194-196 ◽  
pp. 1920-1923
Author(s):  
Pan Li Hua ◽  
Rui Cheng Yang
Keyword(s):  
Corrosion Resistance ◽  
Kinetic Parameters ◽  
Empirical Formula ◽  
Corrosion Process ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Kinetics Of ◽  
Hcl Solution

The kinetics of corrosion process on five Ni—Cr—Mo—Cu alloys designed by the empirical formula APF=4Cr/ (2Mo+Cu) in HCl solution have been investigated at the concentration range from 0.002mol/cm3to 0.012 mol/cm3and 20°C. It is developed that the kinetic parameters and the dependence of the corrosion resistance on the APF have discussed.

The Dependence of the Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to H2SO4 Solution on the 4Cr/ (2Mo+Cu)

2011 ◽  
Vol 194-196 ◽  
pp. 1912-1915
Author(s):  
Li Hua Pan ◽  
Rui Cheng Yang
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Process ◽  
Cathodic Reaction ◽  
H2so4 Solution ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Analytical Expressions ◽  
Kinetics Of

The kinetics of corrosion process on Ni-Cr-Mo-Cu alloys designed by formula APF=4Cr/(2Mo+Cu) in H2SO4 solution have been investigated from the concentration of 0.002mol/cm3 to 0.012mol/cm3 at 20 . Analytical expressions for cathodic reaction were developed for the reduction of H+ and the reduction of oxygen. It is discussed that the corrosion resistance to H2SO4 solution depend on the APF in regular way.

The Dependence of Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to NaOH Solution on 4Cr/ (2Mo+Cu)

2011 ◽  
Vol 55-57 ◽  
pp. 374-377 ◽  
Author(s):  
Li Hua Pan ◽  
Rui Cheng Yang
Keyword(s):  
Corrosion Resistance ◽  
Kinetic Parameters ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Naoh Solution ◽  
Kinetics Of

The kinetics of the corrosion procession of Ni-Cr-Mo-Cu alloys designed by the formula APF=4Cr/ (2Mo+Cu) in NaOH solution have been investigated at the concentration range from 0.0025mol/cm3 to 0.015mol/cm3 and 20°C. It were developed that the kinetic parameters depend on the APF. It is discussed that the dependence of the corrosion resistance to NaOH solution on the APF.

Researched on the Corrosion Resistance of Ni-Cr-Mo-Cu Alloy to Aqueous Change with the APF in Regular Way: an Approach of Quantum Electrochemistry

2011 ◽  
Vol 55-57 ◽  
pp. 378-381
Author(s):  
Li Hua Pan ◽  
Rui Cheng Yang
Keyword(s):  
Corrosion Resistance ◽  
Cathodic Current ◽  
Cu Alloy ◽  
Cu Alloys

The corrosion resistance of Ni-Cr-Mo-Cu alloys designed by formula APF=4Cr/(2Mo+Cu) to aqueous depend on the APF is investigated. The cathodic current of corrosion reactions was expressed as the quantum electrochemical equation. It is discussed that the APF controls the corrosion resistance to aqueous.

Mechanical and Corrosion Behaviors of the Casting Al-Cu Alloy Modified by Nano-Scale PrxOy and LaxOy

2015 ◽  
Vol 1120-1121 ◽  
pp. 1053-1058
Author(s):  
Hai Long Zhao ◽  
Wen Zhang ◽  
Chun Lin Zhang ◽  
Da Qian Sun ◽  
Xu Wang
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Fracture Strain ◽  
Electrochemical Corrosion ◽  
Nano Scale ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Electrochemical Corrosion Behavior ◽  
Corrosion Behaviors ◽  
Mechanical Properties And Corrosion

The mechanical properties and corrosion behaviors of the casting Al-Cu alloys were investigated. The proportion of the two modifiers (PrxOy and LaxOy) has effects on the mechanical properties and the electrochemical corrosion behavior of the casting Al-Cu alloy. The ultimate true tensile strength of the Al-Cu alloy modified only by LaxOy is the highest (616.0 MPa). The fracture strain of the Al-Cu alloy modified by PrxOy and LaxOy is the highest (12.3%). The Al-Cu alloy modified by PrxOy has better corrosion resistance than any other Al-Cu alloy. The prominent mechanical properties should be attributed to the finer crystal grains and more homogeneously distributed nano-scale phase precipitates. The existence of continuous and compact protective Al2O3 and RE-O films enhanced the corrosion resistance of the modified Al-Cu alloy during the corrosion process.

scholarly journals Kinetics of Corrosion Process in H2SO4 and HNO3 Aqueous Solutions of Lead Free Sn-Ag-Cu Solder Alloys

2016 ◽  
Vol 61 (2) ◽  
pp. 559-568
Author(s):  
J. Guśpiel ◽  
A. Wierzbicka-Miernik ◽  
W. Reczyński
Keyword(s):  
Aqueous Solutions ◽  
Absorption Spectrometry ◽  
Corrosion Current ◽  
Corrosion Process ◽  
Rotating Disc ◽  
Corrosive Media ◽  
Corrosion Resistant ◽  
Cu Alloys ◽  
Kinetics Of ◽  
Pure Sn

Abstract This paper presents the results of the corrosion resistance of Sn-Ag-Cu alloys in air-saturated aqueous solutions containing NO3-, SO42- ions, whose concentration was equivalent to their contents in acid rains and in concentrations 10 - 100 times higher. The Ag, Cu and Sn concentrations in the corrosive media were determined using the Atomic Absorption Spectrometry. The specific dissolution rate and corrosion current were derived using the a rotating disc technique. The corrosion rate of Sn- Ag-Cu alloys depends on pH of the examined solutions and on the concentration of oxygen near the phase boundary. In the whole range of concentrations of the applied H2SO4 + HNO3 mixtures of acids, the pure Sn was more corrosion resistant than eutectic alloy as well as the near eutectic one, following the sequence: Sn>Sn3.66Ag0.91Cu>3.8Ag0.7Cu.

Effect of Mn on the Nanoprecipitation in Binary Fe-Cu alloys

2011 ◽  
Vol 172-174 ◽  
pp. 297-302 ◽  
Author(s):  
Rajashekhara Shabadi ◽  
Roland Taillard ◽  
Bertrand Radiguet ◽  
Jérémie De Baerdemaeker ◽  
Elke Leunis
Keyword(s):  
Advanced Characterization ◽  
Positron Annihilation Spectroscopy ◽  
Atom Probe ◽  
Number Density ◽  
Homogenization Treatment ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Tomographic Atom Probe ◽  
Aging Kinetics ◽  
Kinetics Of

Effect of the third alloying element Mn on Cu-precipitation was studied in a binary Fe-1.3% Cu alloy. Precipitation in both the alloys was investigated after homogenization treatment and subsequent artificial aging. Advanced characterization techniques such as Positron Annihilation Spectroscopy (PAS) and Tomographic Atom Probe (TAP) were used to establish the chemical composition, morphology, size and number density of the Cu-rich phases. Combined results of PAS and TAP were particularly useful in order to follow the Cu precipitation in the binary alloy. At short aging times, addition of Mn significantly increased the kinetics of hardening while its effect on the magnitude of precipitation strengthening is only marginal. It further increases the over-aging kinetics.

EFFECT OF SCANDIUM ON THE CORROSION BEHAVIOR OF THE CASTING Al-Cu ALLOYS IN NACL SOLUTION

2009 ◽  
Vol 23 (06n07) ◽  
pp. 978-983 ◽  
Author(s):  
WENGUI ZHAO ◽  
JINGUO WANG ◽  
JINGQI HOU ◽  
QICHUAN JIANG
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Electrochemical Measurement ◽  
Immersion Test ◽  
Nacl Solution ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Sc Addition ◽  
Equiaxed Grains ◽  
Better Than

Corrosion behavior of the casting Al - Cu alloys with and without Sc addition was studied by both the immersion test and electrochemical measurement methods. The results show that pitting corrosion was found on the surfaces of these alloys in 3.5 wt .% NaCl solution, while the corrosion resistance of the Al - Cu alloys with Sc is better than that of the Al - Cu alloy without Sc . With increasing Sc content, the corrosion resistance of the present Al - Cu alloys varies significantly, and the 0.1 wt .% Sc alloy has the best corrosion resistance. Also, the corrosion potential of the present alloys with Sc is shifted positively compared with that of the alloy without Sc by electrochemical measurement, indicating that the alloys with Sc have better corrosion resistance. The microstructures of the Al - Cu alloys change from the coarse grains to the fine equiaxed grains due to Sc addition, which is responsible for the reduced susceptibility to corrosion and the enhanced corrosion resistance of the present alloys.

Plastic deformation of θ ' in Al-4%Cu alloy

1978 ◽  
Vol 36 (1) ◽  
pp. 576-577
Author(s):  
Shrikant P. Bhat
Keyword(s):  
Deformation Behavior ◽  
Room Temperature ◽  
Electron Microscopic Observation ◽  
Bulk Alloy ◽  
Electron Microscopic ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Orowan Mechanism ◽  
The Subject ◽  
Cyclic Straining

deformation behavior of Al-Cu alloys aged to contain θ ' has been the subject of many investigations (e.g., Ref. 1-5). Since θ ' is strong and hard, dislocations bypass θ ' plates (Orowan mechanism) at low strains. However, at high strains the partially coherent θ ' plates are probably sheared, although the mechanism is complex, depending on the form of deformation. Particularly, the cyclic straining of the bulk alloy is known to produce gross bends and twists of θ '. However, no detailed investigation of the deformation of θ ' has yet been reported; moreover, Calabrese and Laird interpreted the deformation of θ ' as largely being elastic.During an investigation of high temperature cyclic deformation, the detailed electron-microscopic observation revealed that, under reversed straining conditions, θ ' particles are severely distorted--bent and twisted depending on the local matrix constraint. A typical electronmicrograph, showing the twist is shown in Fig. 1. In order to establish whether the deformation is elastic or plastic, a sample from a specimen cycled at room temperature was heated inside the microscope and the results are presented in a series of micrographs (Fig. 2a-e).

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