Preparation of Micro/Nano-Structure Superhydrophobic Film on Aluminum Plates Using Galvanic Corrosion Method

The galvanic corrosion behavior of anodic AA6061 Al and C1100 Cu couples is investigated. Anodized AA6061-T6 Al plates were produced at different thickness of 1μm, 5μm and 12μm, respectively. The galvanic corrosion current of anodized plate and C1100 copper plate couples was measured using a zero resistance ammeter for 8 hours in two solutions, 3.5wt.% NaCl solution and 1.0 wt.% NaClO solution under temperatures of 25°C, 40°C and 60°C. The results show that the AA6061-T6 aluminum plate without anodizing produced the highest galvanic corrosion current, 1200 μA/cm2, among the tested specimens under flowing NaClO electrolyte at 60°C. Anodized AA6061-T6 aluminum plates with a 12μm anodized layer produced the lowest galvanic corrosion current, 15 μA/cm2, in a static 3.5wt.% NaCl electrolyte at 25°C. Severe corrosion attack was observed at the aluminum specimen with thin and non-uniform anodized layer after the galvanic corrosion tests. The anodizing AA6061 Al plate process can effectively reduce the galvanic corrosion of the AA6061 Al and C1100 Cu couples.

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Noncontact Air-Coupled Guided Wave Ultrasonics for Detection of Thinning Defects in Aluminum Plates

Research in Nondestructive Evaluation ◽

10.1080/09349840108968178 ◽

2001 ◽

Vol 13 (1) ◽

pp. 61-77 ◽

Cited By ~ 2

Author(s):

D. Tuzzeo ◽

F. Lanza di Scalea

Keyword(s):

Guided Wave ◽

Aluminum Plates

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Modelling of galvanic corrosion based on potentiodynamic polarisation measurements under a thin layer of electrolyte

Matériaux & Techniques ◽

10.1051/mattech/2015012 ◽

2015 ◽

Vol 103 (5) ◽

pp. 502

Author(s):

Vit Jeníček ◽

Linda Diblíková ◽

Martina Pazderová

Keyword(s):

Thin Layer ◽

Galvanic Corrosion ◽

Potentiodynamic Polarisation ◽

Polarisation Measurements

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Comparative study of the effective parameters on residual stress relaxation in welded aluminum plates under cyclic loading

Mechanics & Industry ◽

10.1051/meca/2020061 ◽

2020 ◽

Vol 21 (5) ◽

pp. 505

Author(s):

Yousef Ghaderi Dehkordi ◽

Ali Pourkamali Anaraki ◽

Amir Reza Shahani

Keyword(s):

Residual Stress ◽

Cyclic Loading ◽

Stress Relaxation ◽

Stress Amplitude ◽

Cyclic Plasticity ◽

Mean Stress ◽

Effective Parameters ◽

Perfect Plasticity ◽

Residual Stress Relaxation ◽

Aluminum Plates

The prediction of residual stress relaxation is essential to assess the safety of welded components. This paper aims to study the influence of various effective parameters on residual stress relaxation under cyclic loading. In this regard, a 3D finite element modeling is performed to determine the residual stress in welded aluminum plates. The accuracy of this analysis is verified through experiment. To study the plasticity effect on stress relaxation, two plasticity models are implemented: perfect plasticity and combined isotropic-kinematic hardening. Hence, cyclic plasticity characterization of the material is specified by low cycle fatigue tests. It is found that the perfect plasticity leads to greater stress relaxation. In order to propose an accurate model to compute the residual stress relaxation, the Taguchi L18 array with four 3-level factors and one 6-level is employed. Using statistical analysis, the order of factors based on their effect on stress relaxation is determined as mean stress, stress amplitude, initial residual stress, and number of cycles. In addition, the stress relaxation increases with an increase in mean stress and stress amplitude.

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Corrosion of Electronic and Magnetic Devices and Materials

MRS Proceedings ◽

10.1557/proc-451-541 ◽

1996 ◽

Vol 451 ◽

Author(s):

Gerald S. Frankel

Keyword(s):

Thin Film ◽

Failure Modes ◽

Galvanic Corrosion ◽

Potential Drop ◽

Magnetic Devices ◽

Disk Structure ◽

Magnetic Layers ◽

Ohmic Potential Drop ◽

Corrosion Problem ◽

Corrosion Susceptibility

ABSTRACTCorrosion of thin film structures commonly used in electronic and magnetic devices is discussed. Typical failure modes are presented, and galvanic corrosion is discussed in some detail since it is one common problem with such devices. A graphical explanation for the determination of the ohmic potential drop during galvanic corrosion is presented. The corrosion problem of thin film disks is shown to have changed during the past ten years owing to changes in disk structure. The corrosion susceptibility of two antiferromagnetic alloys used for exchange coupling to soft magnetic layers is discussed.

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Formation of micro-nano structure by laser deposition and dealloying of copper alloy layer on macro-component surface

Pacific International Conference on Applications of Lasers and Optics ◽

10.2351/1.5057151 ◽

2008 ◽

Author(s):

Yide Kan ◽

Wenjin Liu ◽

Minlin Zhong ◽

Mingxing Ma ◽

Weiming Zhang ◽

...

Keyword(s):

Copper Alloy ◽

Alloy Layer ◽

Laser Deposition ◽

Nano Structure ◽

Macro Component

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Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v13i2.5942 ◽

2017 ◽

Vol 13 (2) ◽

pp. 4671-4677 ◽

Cited By ~ 2

Author(s):

A. M. Abdelghany ◽

A.H. Oraby ◽

Awatif A Hindi ◽

Doaa M El-Nagar ◽

Fathia S Alhakami

Keyword(s):

Self Assembly ◽

Metallic Nanoparticles ◽

Room Temperature ◽

Bimetallic Nanoparticles ◽

Reduction Process ◽

Nano Particles ◽

Nano Structure ◽

Small Shift ◽

Molar Ratios ◽

Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

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Development of corrosion flaws for the production of realistic test specimens

Koroze a ochrana materialu ◽

10.2478/kom-2020-0004 ◽

2020 ◽

Vol 64 (1) ◽

pp. 23-28

Author(s):

J. Hodač ◽

Z. Fulín ◽

P. Mareš ◽

J. Veselá ◽

O. Chocholatý

Keyword(s):

Power Plants ◽

Galvanic Corrosion ◽

Water Solution ◽

Erosive Wear ◽

Corrosion Damage ◽

Water Mist ◽

Carbon Steels ◽

Bending Stress ◽

Solution Flow ◽

Mechanical Bending

AbstractTo produce realistic test specimens with realistic flaws, it is necessary to develop appropriate procedure for corrosion flaw production. Tested specimens are made from steels commonly used in power plants, such as carbon steels, stainless steels and their dissimilar weldments. In this study, corrosion damage from NaCl water solution and NaCl water mist are compared. Specimens were tested with and without mechanical bending stress. The corrosion processes produced plane, pitting and galvanic corrosion. On dissimilar weldments galvanic corrosion was observed and resulted to the deepest corrosion damage. Deepest corrosion flaws were formed on welded samples. The corrosion rate was also affected by the solution flow in a contact with the specimens, which results in a corrosion-erosive wear. Produced flaws are suitable as natural crack initiators or as realistic corrosion flaws in test specimens.

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