Analysis of technological approaches to electrochemical surface treatment of aluminum alloys

Today, aluminum alloys are being considered as substitutes for many automotive parts made from steels because of the growing interest in producing lightweight vehicles. Consequently, it is crucial to understand the fatigue lifetime—the property itself and its behavior—of aluminum alloys, and to clarify its capacities at both room temperature and 1001 elevated temperatures. In particular, the aluminum alloys in the AA5xxx (non-precipitation-hardenable) and AA6xxx (precipitation-hardenable) series are very similar to those found in automotive industries, and are both frequently mentioned and the focus of studies. The satisfactory fatigue lifetime and the improved strength of aluminum alloys make them a strong candidate for automotive industries. This article focuses upon the fatigue property and behavior of aluminum alloys at room temperature and elevated temperatures. Then, the focus will shift to the concept of mechanical surface treatment, the so-called deep-rolling process, which can be used to improve the fatigue lifetime of aluminum alloys. The effects of a mechanical surface treatment on the fatigue properties and behavior of the aluminum alloys AA5083 and AA6110, and the residual stress stability at room temperature and elevated temperatures has been discussed. Moreover, modified deep-rolling processes, i.e., deep-rolling followed by an appropriate annealing process and high-temperature deep-rolling, have been elaborated upon in this article.

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Ranking of metallic and non-metallic coatings in the electrochemical surface treatment sector

Tsvetnye Metally ◽

10.17580/tsm.2021.04.09 ◽

2021 ◽

pp. 54-58

Author(s):

E. G. Vinokurov ◽

T. F. Burukhina ◽

I. S. Kuroshev

Keyword(s):

Surface Treatment ◽

Correlation Coefficient ◽

The United States ◽

Critical Value ◽

Electrochemical Methods ◽

Metallic Coatings ◽

Metal Coatings ◽

Technical Research ◽

Priority Areas ◽

Electrochemical Surface Treatment

The distribution of coatings by the frequency of their application during surface treatment by electrochemical methods is considered. This is important not only for understanding the structure of the electrochemical surface treatment sector, but also for identifying priority areas of scientific and technical research. Nonparametric statistical methods show the uniformity of samples and reveal the relationship between the number of enterprises that sell a certain type of coating, i.e. the frequency of applying a certain type of coating in different countries (USA, Japan, Italy, France, Germany, Great Britain, Spain, Canada, Mexico, Russia, South Africa). The results of testing the hypothesis of a close relationship between the ranks of coatings showed that a significant correlation was found between the distribution of coatings by the frequency of their application (implementation) among all countries. For example, when comparing the United States and Canada, the rank correlation coefficient is 0.62 (the lowest value obtained), which is greater than the calculated critical value of 0.56; when comparing Italy and Spain, the correlation coefficient takes the highest value of 0.97, which is greater than the critical value of 0.19. The results obtained allowed us to use this data to compile a generalized rating of the frequency of use of all coatings based on data from different countries. Based on the analysis, metal coatings can be arranged in a row according to the descending frequency of their application: Cr > Ni > Zn > Cu > Cd. The results of the ranking of coatings showed that the most commonly used electrochemical methods for surface treatment are metal coatings with chromium and nickel, and among the inorganic non – metallic coatings-oxide and then phosphate, which allows us to highlight the research devoted to the application of these coatings as priority areas of scientific and technical research.

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Effect of passive film on electrochemical surface treatment for indium tin oxide

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2012.09.147 ◽

2013 ◽

Vol 550 ◽

pp. 263-267 ◽

Cited By ~ 5

Author(s):

Yung-Fu Wu ◽

Chi-Hao Chen

Keyword(s):

Surface Treatment ◽

Passive Film ◽

Tin Oxide ◽

Indium Tin Oxide ◽

Electrochemical Surface Treatment

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Structure and Properties of Aluminum Alloys Modified with Silicon Carbide by Laser Surface Treatment

Materials Science ◽

10.1007/s11003-005-0168-9 ◽

2005 ◽

Vol 41 (3) ◽

pp. 316-323 ◽

Cited By ~ 6

Author(s):

H. V. Pokhmurs'ka ◽

M. M. Student ◽

N. R. Chervins'ka ◽

Kh. R. Smetana ◽

A. Wank ◽

...

Keyword(s):

Silicon Carbide ◽

Aluminum Alloys ◽

Surface Treatment ◽

Laser Surface ◽

Structure And Properties ◽

Laser Surface Treatment

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Effect of laser ablation surface treatment on performance of adhesive-bonded aluminum alloys

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2016.04.051 ◽

2016 ◽

Vol 304 ◽

pp. 340-347 ◽

Cited By ~ 28

Author(s):

Yongrong Wu ◽

Jianping Lin ◽

Blair E. Carlson ◽

Peng Lu ◽

Michael P. Balogh ◽

...

Keyword(s):

Laser Ablation ◽

Aluminum Alloys ◽

Surface Treatment

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Improving of Surface Quality of Metal Reflector Mirrors Machined by Single Point Diamond Turning

Devices and Methods of Measurements ◽

10.21122/2220-9506-2021-12-2-139-145 ◽

2021 ◽

Vol 12 (2) ◽

pp. 139-145

Author(s):

G. A. Gusakov ◽

G. V. Sharonov

Keyword(s):

Heat Treatment ◽

Aluminum Alloy ◽

Aluminum Alloys ◽

Surface Treatment ◽

Radiation Resistance ◽

Single Point ◽

Diamond Turning ◽

Laser Damage Threshold ◽

Complete Disappearance

Improving the technology of diamond turning of aluminum alloys is of great importance for expanding the application areas of metal-optical products based on aluminum in aerospace technology. The aim of this work was to study the effect of surface inhomogeneities of the initial aluminum alloy substrates on their optical and mechanical characteristics and to determine ways of improving the quality of aluminum reflector mirrors manufactured using nanoscale single point diamond turning. The investigated reflector mirrors were made from AMg2 aluminum alloy. The optical surface treatment was carried out on a precision turning lathe with an air bearing spindle using a special diamond cutter with a blade radius of ≤ 0.05 μm. The analysis of the surface structure of the AMg2 alloy substrates was carried out by scanning electron microscopy / electron microprobe. The quality control of the surface treatment of the manufactured reflector mirrors was carried out by atomic force microscopy. The reflectivity and radiation resistance of these samples were also investigated.It is shown that an important problem in the manufacture of optical elements from aluminum alloys is the inhomogeneity of the structure of the initial material, associated with the presence of intermetallic inclusions. Heat treatment of the AMg2 alloy substrates at T ≥ 380 °C makes it possible to improve the quality of surface and the radiation resistance of aluminum mirrors both by removing mechanical stresses and by partially homogenizing the starting material. The optimum is heat treatment at the maximum allowable temperature for the AMg2 alloy T = 540 ºС, as a result of which there is a complete disappearance of intermetallic inclusions with an increased magnesium content. The use of high-temperature heat treatment of AMg2 alloy substrates allows, in comparison with unannealed samples, to reduce the surface roughness from 1.5 to 0.55 nm, to increase the reflectivity of mirrors at a wavelength of 1064 nm from 0.89 to 0.92, and to increase the laser damage threshold from 3.5 to 5 J / cm2.

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ALCOA 6082

Alloy Digest ◽

10.31399/asm.ad.al0394 ◽

2005 ◽

Vol 54 (6) ◽

Keyword(s):

Corrosion Resistance ◽

Shear Strength ◽

Aluminum Alloys ◽

Physical Properties ◽

Surface Treatment ◽

Tensile Properties ◽

Heat Treating ◽

6Xxx Series

Abstract Alloy 6082 is part of the 6xxx series of aluminum alloys. It is similar to 6061, but not quite equivalent in physical properties. It does have higher strength than 6061. The 6082 alloy is used in structural shapes and profiles. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: AL-394. Producer or source: Alcoa Engineered Products.

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FINKL ALU-X

Alloy Digest ◽

10.31399/asm.ad.al0363 ◽

1999 ◽

Vol 48 (10) ◽

Keyword(s):

Thermal Conductivity ◽

Shear Strength ◽

Aluminum Alloys ◽

Physical Properties ◽

Surface Treatment ◽

Tensile Properties ◽

Solution Treated

Abstract Finkl Alu-X is a modification of UNS A92618 with higher thermal conductivity than many aluminum alloys used for molds. The alloy, when forged, solution treated, and stabilized, is well suited for pressure applications. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on casting, machining, joining, and surface treatment. Filing Code: AL-363. Producer or source: A. Finkl & Sons Company.

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