Surface Modification of Aluminum 6061-O Alloy by Plasma Electrolytic Oxidation to Improve Corrosion Resistance Properties

Dzhurinskiy, D.; Dautov, S. S.; Shornikov, P.; Akhatov, Iskander

doi:10.3390/coatings11010004

Cited by 22 publications

(14 citation statements)

References 25 publications

(29 reference statements)

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“…This is the case with pure aluminum. This behavior is characteristic of aluminum alloys without anodizing treatment since they naturally form a barrier layer when in contact with oxygen from the environment [73,74].…”

Section: Cyclic Potentiodynamic Polarization (Cpp)mentioning

confidence: 98%

“…As shown in Table 3, the i corr values are minimal, except in sample AA 6061. The dissolution (solubility) of the aluminum, Al-hydroxide, and various forms of Al oxide in water and non-complexing solutions is very small [73,74]. However, in aqueous complex-forming solutions (e.g., citrate, oxalate, salicylate), the minimum solubility is not so well expressed, and the dissolution is controlled by surface complexation reactions [70,71].…”

Section: Cyclic Potentiodynamic Polarization (Cpp)mentioning

confidence: 99%

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Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061

Miramontes

Almeraya-Calderón

López

et al. 2021

Metals

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Hard-anodized is a widely used method in the aeronautical sector to improve aluminum alloys abrasion and corrosion resistance. Aim of this work was to characterize the mechanical properties and resistance hard-anodized aluminum 6061 in citric acid solution as a replacement sulfuric acid solution were investigated. Aluminum alloy 6061 was used as the base material to produce the hard anodizing; this process was carried out in a citric and sulfuric acid solution, applying current densities 3 and 4.5 A/cm2 and subsequently exposed to 3.5 wt. % NaCl solution. Microstructure and mechanical properties of the anodizing material were characterized by scanning electron microscopy (SEM) and Vickers microhardness (HV). Corrosion behavior of the hard-anodized material it was carried out with electrochemical techniques as cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) respectively. Results obtained indicated that all samples anodized in citric acid solution showed negative hysteresis and lower corrosion current density (1 × 10−10 A/cm2), indicating generalized corrosion on the material surface. EIS results show that anodizing in citric acid solution and a current density of 4.5 A/dm2 provides better corrosion protection than a sulfuric acid solution.

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Section: Cyclic Potentiodynamic Polarization (Cpp)mentioning

confidence: 98%

Section: Cyclic Potentiodynamic Polarization (Cpp)mentioning

confidence: 99%

Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061

Miramontes

Almeraya-Calderón

López

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…They are: (i) pitting corrosion; (ii) stress corrosion cracking; (iii) intergranular corrosion. Protective coatings are used to protect Al alloys from corrosive environments [6]. Basically, such coatings isolate structural members from the environments, improving the material's corrosion resistance.…”

Section: Need For Surface Modification Of 6xxx Series Al Alloysmentioning

confidence: 99%

“…The need for weight reduction and improvement in mechanical properties in automobile, aerospace, sports, and health care industries has stimulated the development of new materials and processes. In addition, the requirement of material with specific functional properties has also contributed to the growth of this particular domain [1][2][3][4][5][6]. Aluminum (Al) alloys and their derivatives form an important sector in this development.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of 6xxx Series Aluminum Alloys

et al. 2022

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Due to their superior mechanical properties, formability, corrosion resistance, and lightweight nature, 6xxx series aluminum (Al) alloys are considered as a promising structural material. Nevertheless, the successful application of these materials depends on their response to the external environment. Recently, designers considered the surface properties an equally important aspect of the component design. Due to this concern, these alloys are subjected to varieties of surface modification methodologies. Many methodologies are explored to modify the 6xxx series Al alloys surfaces effectively. These methods are anodizing, plasma electrolytic oxidation (PEO), cladding, friction stir processing, friction surfacing, melting, alloying, and resolidification using high energy beams, etc. This review work discusses some of these methods, recent research activities on them, important process variables, and their role on the final properties of the surfaces.

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“…It can be accomplished using various techniques includes varying microstructural responses based on the process parameters of the equipment. The techniques are following such as electroplating [2], physical vapour deposition [3], chemical vapour deposition [4], plasma spraying [5,6], and laser surface alloying [7], etc. which increases the processing cost and also it require expensive post-processing and curing process.…”

Section: Introductionmentioning

confidence: 99%

Process Optimisation and Tribological Behaviour Studies on Surface Modified Al 6061-T6 Alloy Deposited with WS2 Solid Lubricant Layer Through Electrical Discharge Approach

2021

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In this present work, an attempt has been made to deposit the WS 2 layer on the Al 6061-T6 alloy surface through the electrical discharge deposition (EDD) technique. Specified deposition parameters, namely powder concentration (C p ), pulse-on time (P on ), and gap voltage (V g ) with various levels considered during the EDD process. The experimentation was performed for analysing the results of deposition parameters on material deposition rate (MDR), surface roughness (SR), microhardness (MH), layer thickness (LT), and surface characteristics of the WS 2 layer were examined. The results addressed the various intermetallic compounds formed on the deposited surface. A multi-objective optimisation using Box-Behnken design of response surface methodology was utilised to conduct the deposition process. To predict and optimise the appropriate MDR, SR, MH, and LT, the quadratic model was developed using regression analysis and analysis of variance. Based on the developed model, the interaction effects of deposition parameters on the EDD process were explored. The optimal depositing parameters are determined by maximising the MDR and MH and minimising the SR and LT. The validation test results confirm that experimental data are good in agreement with the predicted results, and hence, the model is feasible to predict the responses adequately. The tribological study was carried out for the optimised condition, and surface characteristics on the worn-out surface were analysed. When compared to the base material, the obtained results show a lower coefficient of friction and specific wear rate.

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Surface Modification of Aluminum 6061-O Alloy by Plasma Electrolytic Oxidation to Improve Corrosion Resistance Properties

Cited by 22 publications

References 25 publications

Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061

Citric Acid as an Alternative to Sulfuric Acid for the Hard-Anodizing of AA6061

Surface Modification of 6xxx Series Aluminum Alloys

Process Optimisation and Tribological Behaviour Studies on Surface Modified Al 6061-T6 Alloy Deposited with WS2 Solid Lubricant Layer Through Electrical Discharge Approach

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