Improvement of the Functional Characteristics of Coatings Obtained By the Method of Hard Anodizing of Aluminum Alloys

Студент, М. М.; Pohrelyuk, І. М.; Chumalo, H. V.; Hvozdetskyi, V. M.

doi:10.1007/s11003-021-00500-x

Cited by 5 publications

(6 citation statements)

References 22 publications

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“…[16][17][18][19] In particular, the improvement of the surface properties by hard-anodizing has been studied in detail. [20] In addition, recent works concerned the corrosion protection of anodized wrought Al alloys for aerospace application and the re-use of anodizing waste. [21,22] However, the anodizing response of Al-Si foundry alloys, which remain the most used and spread Al casting alloys, has not been studied in depth, due to the difficulty in obtaining a uniform oxide layer.…”

Section: Introductionmentioning

confidence: 99%

Anodizing Al–Si Foundry Alloys: A Critical Review

Scampone

Timelli

2022

Adv Eng Mater

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Compared with pure aluminum and wrought aluminum alloys, Al foundry alloys are more difficult to be anodized. The high content of alloying elements prevents the uniform growth of the Al oxide layer and enhances the embedding of defects in the anodic film. The microstructure of the substrate and the anodizing parameters play a key role in the final quality of the oxide layer. Variations in the chemical composition, casting process, and pre-and post-anodizing treatments can significantly affect the anodizing response. This work aims to critically review the main factors influencing the growth and morphology of the anodic layer in Al-Si foundry alloys. In particular, the effects on the oxide thickness, surface mechanical properties, and corrosion resistance are discussed in detail.

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Section: Introductionmentioning

confidence: 99%

Anodizing Al–Si Foundry Alloys: A Critical Review

Scampone

Timelli

2022

Adv Eng Mater

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“…The microhardness of the synthesized layer increased from 5.2 to 6.8 GPa, and their wear resistance by 1.4-2.3 times as the ozone concentration increased from 1 to 5 mg/L. It was also found that the thickness of the anodized layer increased by 50% when hydrogen peroxide was added to the base electrolyte (20% aqueous solution of H 2 SO 4 ) [33]. In addition, the microhardness of the HALs also increased by 60% (from 400 to 650 HV) with an increase in the concentration of hydrogen peroxide in the electrolyte of the base composition from 0 to 70 g/L.…”

Section: Introductionmentioning

confidence: 91%

“…Therefore, it is widely used in industry. However, due to its significant disadvantages (low hardness ≤500 HV and wear resistance [29][30][31][32][33]), its wider application for surface hardening of various elements is limited.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that the higher the temperature of the electrolyte during anodization, the greater the number of water molecules is included in the HAL. At the same time, the microhardness of anodized layers decreases with an increase in the number of water molecules in their composition [33]. Thus, hydrated aluminum oxide Al The purpose of this work is to establish the effect of heat treatment parameters on the structure, phase composition, microhardness, and abrasive wear resistance of 1011 aluminum alloy with hard-anodized layers formed after different anodizing times.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Heat Treatment on the Structural-Phase State and Abrasive Wear Resistance of a Hard-Anodized Layer on Aluminum Alloy 1011

et al. 2023

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The aim of this study was to evaluate the effect of heat treatment on the phase composition, hardness, and abrasion wear resistance of hard-anodized layers (HAL) on 1011 aluminum alloy. X-ray diffraction analysis revealed the Al2O3·3H2O phase in the structure of HAL synthesized for 1 h. While in the heat-treated HAL, aluminum oxide phases of the α-Al2O3(amorphous) and γ-Al2O3(amorphous) types were found. Treatment at 400 °C for 1 h increased the HAL microhardness from 400 to 650 HV, and its abrasive wear resistance with fixed abrasive by up to 2.6 times. The ranking of various ways of hardening aluminum alloys relative to the D16 alloy showed that the abrasive wear resistance of heat-treated HAL is 20 times higher. Plasma electrolyte oxidation increased the abrasive wear resistance of the D16 alloy by 70–90 times, and its coating with high-speed oxygen fuel by 75–85 times. However, both methods are complex, energy-consuming, and require fine grinding of parts. Despite the lower wear resistance of HAL, their synthesis is cheaper and does not require the fine-tuning of parts. Moreover, despite the low hardness of HAL at present, hard anodizing is already commercially used to harden engine pistons, clamshell rotators, and pulleys.

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“…The most common method of finishing the surface of aluminum and its alloys is anodic oxidation, which is used as a protective coating with various properties, including anticorrosive [1], decorative with or without dyes, as well as hard anodizing coating to improve the wear resistance of the surface [2]. Anodizing is an electrochemical process of the growth of an oxide film on the surface of aluminum, which is used as an anode in an electrolytic cell, due to the introduction of oxygen ions into the metal under the effect of electric voltage.…”

Section: Introductionmentioning

confidence: 99%

Hard anodizing of AK9ch high silicon aluminum alloy

Sokolov,

Voroshnin,

Putrolaynen

2024

J. Phys.: Conf. Ser.

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This work is devoted to anodic oxidation at low temperatures in the sulfuric acid electrolyte of the foundry aluminum alloy AK9ch, with a high silicon content. Optimal anodizing conditions were chosen for obtaining coatings with a hardness of more than 300 HV and a thickness of about 40 microns. With an increase in the thickness of the coatings by increasing the current density or anodizing time, their hardness begins to decrease. The resulting hard coatings are planned to be used on large parts obtained by casting aluminum alloy AK9ch.

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Improvement of the Functional Characteristics of Coatings Obtained By the Method of Hard Anodizing of Aluminum Alloys

Cited by 5 publications

References 22 publications

Anodizing Al–Si Foundry Alloys: A Critical Review

Anodizing Al–Si Foundry Alloys: A Critical Review

The Effect of Heat Treatment on the Structural-Phase State and Abrasive Wear Resistance of a Hard-Anodized Layer on Aluminum Alloy 1011

Hard anodizing of AK9ch high silicon aluminum alloy

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