THE INFLUENCE OF VARIOUS ADDITIVES ON THE PROPERTIES OF PEO COATINGS FORMED ON AZ31 Mg ALLOY

Rehman, Zeeshan Ur; Ahn, Byung-Hyun; Jeong, Yeong Seung; Song, Jung‐Il; Koo, Bon‐Heun

doi:10.1142/s0218625x16500062

Cited by 14 publications

(6 citation statements)

References 29 publications

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“…In contrast, Al coating's wear rate remains almost constant during all testing durations. A compact structure with uniformly distributed layers and the presence of dense MgAl2O4 make Al the most wear-resistant coating, in accordance with other researches [32,51,52]. Although the depth of wear scars in Al and Ph coatings are at the range of their thicknesses after 60 min, it should be noticed that the thickness of Al is only half of Ph and reveals a much lower track width and volume loss in all evaluations (Table 5).…”

Section: Wear Resistance Of the Coatingssupporting

confidence: 89%

“…This structure provides optimum protection against the rubbing ball because the micro-polishing stage lasts more at the presence of surface pores until fragmented protrusions fill and press inferior layers. From this point forward, compact MgAl 2 O 4 , reported to be harder than silicate and phosphate products [52], plays an essential role in offering the best wear performance.…”

Section: Discussionmentioning

confidence: 99%

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The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

et al. 2020

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Plasma electrolytic oxidation coatings were prepared in aluminate, phosphate, and silicate-based electrolytic solutions using a soft-sparking regime in a multi-frequency stepped process to compare the structure, corrosion, and wear characteristics of the obtained coatings on AZ31 magnesium alloy. The XRD results indicated that all coatings consist of MgO and MgF2, while specific products such as Mg2SiO4, MgSiO3, Mg2P2O7, and MgAl2O4 were also present in specimens based on the selected solution. Surface morphology of the obtained coatings was strongly affected by the electrolyte composition. Aluminate-containing coating showed volcano-like, nodular particles and craters distributed over the surface. Phosphate-containing coating presented a sintering-crater structure, with non-uniform distributions of micro-pores and micro-cracks. Silicate-containing coating exhibited a scaffold surface involving a network of numerous micro-pores and oxide granules. The aluminate-treated sample offered the highest corrosion resistance and the minimum wear rate (5 × 10−5 mm3 N−1 m−1), owing to its compact structure containing solely 1.75% relative porosity, which is the lowest value in comparison with other samples. The silicate-treated sample was degraded faster in long-term corrosion and wear tests due to its porous structure, and with more delay in the phosphate-containing coating due to its larger thickness (30 µm).

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Section: Wear Resistance Of the Coatingssupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

et al. 2020

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“…The addition of aluminates as a reagent (e.g., NaAlO 2 ) leads to formation of MgAl 2 O 4 in PEO coatings, characterized by much greater stability and higher Pilling-Bedworth ratio compared with MgO [7,8], and results in enhanced anticorrosion performance. Moreover, it was shown that the aluminate-based electrolyte has better structural features (sphericalshaped craters and the lowest level of surface porosity) than phosphate-and silicate-based electrolytes [9]. The addition of fluorides to electrolytes leads to generation of a more compact layer and nobler corrosion potential associated with MgF 2 phase formation [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Design and Multidimensional Screening of Flash-PEO Coatings for Mg in Comparison to Commercial Chromium(VI) Conversion Coating

Wierzbicka

Mohedano

Matykina

et al. 2021

Metals

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REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) regulations demand for an expedient discovery of a Cr(VI)-free alternative corrosion protection for light alloys even though the green alternatives might never be as cheap as current harmful technologies. In the present work, flash- plasma electrolytic oxidation coatings (FPEO) with the process duration < 90 s are developed on AZ31B alloy in varied mixtures of silicate-, phosphate-, aluminate-, and fluoride-based alkaline electrolytes implementing current density and voltage limits. The overall evaluation of the coatings’ anticorrosion performance (electrochemical impedance spectroscopy (EIS), neutral salt spray test (NSST), paintability) shows that from nine optimized FPEO recipes, two (based on phosphate, fluoride, and aluminate or silicate mixtures) are found to be an adequate substitute for commercially used Cr(VI)-based conversion coating (CCC). The FPEO coatings with the best corrosion resistance consume a very low amount of energy (~1 kW h m−2 µm−1). It is also found that the lower the energy consumption of the FPEO process, the better the corrosion resistance of the resultant coating. The superb corrosion protection and a solid environmentally friendly outlook of PEO-based corrosion protection technology may facilitate the economic justification for industrial end-users of the current-consuming process as a replacement of the electroless CCC process.

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“…The pin-on-disk test is often used as an important means of studying friction and wear characteristics [ 29 ]. To highlight the practical application scenarios of the research, the SAE#2 bench test was used in this paper to study the practicability of friction materials in the wet clutch.…”

Section: Methodsmentioning

confidence: 99%

Friction-Wear Characteristics of Carbon Fiber Reinforced Paper-Based Friction Materials under Different Working Conditions

Zheng

Xiong

et al. 2022

Materials

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To study the friction and wear performance of carbon fiber reinforced friction materials under different working conditions, paper-based friction materials with different fibers were prepared. Experiments on the SAE#2 test bench were conducted to study the infectors including friction torques, surface temperature, coefficient of friction (COF), and surface morphologies. The results were analyzed, which indicated that the carbon fiber reinforced friction material could provide a higher friction torque and a lower temperature rising rate under the applied high pressure and high rotating speed conditions. As the pressure increased from 1 MPa to 2.5 MPa, the friction torque of plant fiber reinforced material increased by 150%, the friction torque of carbon fiber reinforced material increased by 400%, and the maximum temperature of plant fiber reinforced and carbon fiber reinforced material reached the highest value at 1.5 MPa. Thus, carbon fibers not only improved the COF and friction torque performance but also had advantages in avoiding thermal failure. Meanwhile, carbon fiber reinforced friction materials can provide a more stable COF as its variable coefficient (α) only rose from 38.18 to 264.62, from 1 MPa to 2.5 MPa, which was much lower than the natural fiber reinforced friction materials. Simultaneously, due to the good dispersion and excellent mechanical properties of PAN chopped carbon fibers, fewer pores formed on the initial surface, which improved the high wear resistance, especially in the intermedia disc.

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THE INFLUENCE OF VARIOUS ADDITIVES ON THE PROPERTIES OF PEO COATINGS FORMED ON AZ31 Mg ALLOY

Cited by 14 publications

References 29 publications

The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

Design and Multidimensional Screening of Flash-PEO Coatings for Mg in Comparison to Commercial Chromium(VI) Conversion Coating

Friction-Wear Characteristics of Carbon Fiber Reinforced Paper-Based Friction Materials under Different Working Conditions

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