Corrosion Protection of Aluminum-Matrix Composites

1995 ◽  
Vol 390 ◽  
Author(s):  
Jiangyuan Hou ◽  
D. D. L. Chung
Keyword(s):  
Thermal Conductivity ◽  
Corrosion Resistance ◽  
Surface Treatment ◽  
Aluminum Matrix ◽  
Electrochemical Process ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Acid Electrolyte ◽  
Effective Surface ◽  
Aluminum Anodizing

ABSTRACTAluminum-matrix composites are attractive in their combination of low CTE and high thermal conductivity. Anodizing is an effective surface treatment for improving the corrosion resistance of aluminum-matrix composites. ForSiC filled aluminum, anodizing was performed successfully in an acid electrolyte, as usual. However, for AIN filled aluminum, anodizing needed to be performed in an alkaline (NaOH) electrolyte instead of an acid electrolyte, because NaOH reduced the reaction between AIN and water, whereas an acid enhanced this reaction. The concentration of NaOH in the electrolyte was critical; too high a concentration of NaOH caused the dissolution of the anodizing product (A12O3) by the NaOH, whereas too low a concentration of NaOH did not provide enough ions for the electrochemical process.

Corrosion Protection of Particulate Aluminum-Matrix Composites by Anodization

1996 ◽  
Vol 451 ◽  
Author(s):  
Jiangyuan Hou ◽  
D. D. L. Chung
Keyword(s):  
Corrosion Resistance ◽  
Pure Aluminum ◽  
Aluminum Matrix ◽  
Electrochemical Process ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Corrosion Properties ◽  
Aluminum Anodization ◽  
Better Than ◽  
Sic Particle

ABSTRACTAnodization is effective for improving the corrosion resistance of aluminum-matrix composites. For SiC particle filled aluminum, anodization was performed successfully in sulfuric acid electrolyte, as usual. However, for AlN particle filled aluminum, anodization needed to be performed in an alkaline (0.7 N NaOH) electrolyte, because NaOH reduced the reaction between AlN and water, whereas an acid enhanced this reaction. The concentration of NaOH in the electrolyte was critical; too high a concentration caused the dissolution of the anodizing product (Al2O3) by the NaOH, whereas too low a concentration did not provide enough ions for the electrochemical process. The corrosion properties and anodization characteristic of pure aluminum, Al/AlN and Al/SiC were compared. Without anodization, pure Al had better corrosion resistance than the composites and Al/SiC had better corrosion resistance than Al/AlN. After anodization, the corrosion resistance of Al/AlN was better than Al/SiC and both composites were better than pure Al without anodization, but still not as good as the anodized pure Al.

Aluminum-Matrix Aluminum Nitride Particle Composite as a Low-Thermal-Expansion Thermal Conductor

1993 ◽  
Vol 323 ◽  
Author(s):  
Shy-Wen Lai ◽  
D. D. L. Chung
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Thermal Expansion ◽  
Volume Fraction ◽  
Liquid Aluminum ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Low Thermal Expansion ◽  
Increasing Temperature

AbstractAluminum-matrix composites containing AIN or SiC particles were fabricated by vacuum infiltration of liquid aluminum into a porous particulate preform under an argon pressure of up to 41 MPa. Al/AIN was superior to Al/SiC in thermal conductivity. At 59 vol.% AIN, Al/AlN had a thermal conductivity of 157 W/m. °C and a thermal expansion coefficient of 9.8 × 10−-6°C−1 (35–100 °C). Al/AlN had similar tensile strength and higher ductility compared to Al/SiC of a similar reinforcement volume fraction at room temperature, but exhibited higher tensile strength and higher ductility at 300–400°C. The ductility of Al/AlN increased with increasing temperature from 22 to 400°C, while that of Al/SiC did not change with temperature. The superior high temperature resistance of Al/AlN is attributed to the lack of a reaction between Al and AIN, in contrast to the reaction between Al and SiC in AI/SiC.

scholarly journals Corrosion Resistance of Al/SiC Laser Cladding Coatings on AA6082

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 673
Author(s):  
Ainhoa Riquelme ◽  
Pilar Rodrigo ◽  
María Dolores Escalera-Rodríguez ◽  
Joaquín Rams
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Laser Cladding ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
The Matrix ◽  
Corrosion Mechanisms ◽  
Silicon Carbide Particles ◽  
Carbide Particles

Aluminum matrix composites reinforced with silicon carbide particles (SiCp) were deposited by laser cladding on AA6082 aluminum alloy. Different compositions of the matrix of the composites coating were used and different amounts of Si and Ti were added to a base of Al-12Si in order to control the reactivity between molten aluminum and SiCp during laser cladding. The corrosion behavior of the coatings deposited was evaluated in 3.5 wt.% NaCl solution using gravimetric analyses and electrochemical polarization tests. The corrosion products observed were Al(OH)3 and Al2O3, and they formed a layer that limited the evolution of corrosion. However, the presence of discontinuities in it reduced the corrosion resistance of the coating. The corrosion mechanisms were different depending on the coating composition. The addiction of Ti to the alloy allowed for better corrosion behavior for the composite coating than that of the aluminum substrate.

scholarly journals Effect of flake powder metallurgy on thermal conductivity of graphite flakes reinforced aluminum matrix composites

2018 ◽  
Vol 53 (11) ◽  
pp. 8180-8192 ◽  
Author(s):  
Nabil Chamroune ◽  
Diaa Mereib ◽  
Florence Delange ◽  
Nathalie Caillault ◽  
Yongfeng Lu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Powder Metallurgy ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Flake Powder Metallurgy

Research and Prospect of Diamond/Aluminum Matrix Composites

2021 ◽  
Vol 871 ◽  
pp. 211-215
Author(s):  
Hao Wu ◽  
Sen Yang
Keyword(s):  
Thermal Conductivity ◽  
Integrated Circuits ◽  
Large Scale ◽  
Heat Dissipation ◽  
Aluminum Matrix ◽  
Matrix Alloy ◽  
Aluminum Matrix Composite ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Interface Bonding

Diamond/aluminum matrix composite with high thermal conductivity is of great significance to solve the heat dissipation problem of large-scale integrated circuits and high-power components. This paper reviews the current research status of diamond/aluminum matrix composites, and analyzes the effects of the preparation and processing of the composites, the interface bonding between diamond and aluminum matrix, the reinforced diamond and matrix alloy elements on the properties of the composites.

Corrosion behavior of particle reinforced aluminum composites

2021 ◽  
Vol 63 (12) ◽  
pp. 1157-1163
Author(s):  
Hasan Karabulut ◽  
Kubilay Karacif ◽  
Ramazan Çıtak ◽  
Hanifi Çinici
Keyword(s):  
Silicon Carbide ◽  
Corrosion Resistance ◽  
Composite Materials ◽  
Mechanical Alloying ◽  
Corrosion Behavior ◽  
Aluminum Matrix ◽  
Electrochemical Corrosion ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Aluminum Powders

Abstract In the study, the corrosion behavior of aluminum matrix composites reinforced with boron carbide (B4C), silicon carbide (SiC) and alumina (Al2O3) were investigated in saltwater (3.5 % NaCl). Composite materials were produced by powder metallurgy. For composite materials production, various reinforcement and aluminum powders were mixed by mechanical alloying for 4 and 10 hours. After mechanical alloying, mixed powders were compacted under 700 MPa pressure and sintered at 600 °C. Electrochemical corrosion tests were applied on specimens in the saltwater solution using potentiodynamic methods. According to the results of the investigation, the best corrosion resistance was obtained by aluminum/B4C and the lowest by aluminum/Al2O3 composites.

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