Exploration and tuning of Al2O3/Mo composite for enhancement of anti-corrosion and tribological characteristics in zinc phosphate conversion coatings

Riyas, A.; Geethanjali, C.V.; Arathy, S.; Anil, Anaswara; Shibli, S.M.A.

doi:10.1016/j.apsusc.2022.153370

Cited by 26 publications

(8 citation statements)

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“…Further, the deep grooves on the coating surface denoted by negative skewness (S sk ) values and the incorporation of 0.3 wt % nanocomposite into the Zn matrix show an increase in the surface skewness from −1.972 to 3.972 μm. This confirms the formation of a consistent and defect-free surface with minimal imperfections 50 due to the effective integration of the tuned composition of the nanocomposite into the coating matrix, and it is further unswerving from the low S q value (2.773 μm) of the 0.3 wt %-RGZ coating. Furthermore, the bare-Zn coating infers a lower S ku (1.480 μm) value than the 0.3 wt %-RGZ (4.483 μm), and it indicates the presence of a significant number of acute protuberances on the surface of the composite coating.…”

Section: Ospmentioning

confidence: 55%

“…The presence of surface defects on the coating ruled out the possibility for ideal capacitance, and thus, C dl existing in the electrochemical process can be calculated using eq : Z CPE = 1 / X 0 false( normali ω false) Φ where Z CPE is the impedance as a function of the constant phase element, X 0 the admittance in Ohm –1 , i the imaginary complex constant, and ω the angular frequency. Φ varies from −1, 0, and +1; Φ = −1 when CPE becomes an ideal capacitor, Φ = 0 for ideal resistor, and Φ = +1 for equivalent inductance …”

Section: Resultsmentioning

confidence: 99%

“…Φ varies from −1, 0, and +1; Φ = −1 when CPE becomes an ideal capacitor, Φ = 0 for ideal resistor, and Φ = +1 for equivalent inductance. 50 Among the developed coatings, the 0.3 wt %-RGZ coating is observed to exhibit the largest diameter with high charge transfer resistance (367.8 Ω cm 2 ) as compared to all other developed coatings. The highest R ct value of the coating further indicates its enhanced corrosion protection due to the presence of homogeneously dispersed impermeable rGO nanosheets and the passivation effect.…”

Section: Tuning Of Electrochemical Characteristics Of the Developed R...mentioning

confidence: 86%

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Multifunctional rGO–ZnO Composite Coatings with Enhanced Mechanical, Anticorrosion, and Antibacterial Characteristics for Practical Applications

Geethanjali,

Elias,

Bijimol

et al. 2023

ACS Appl. Eng. Mater.

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This paper reports the development of multifunctional rGO–ZnO composite (RGZ) coatings with enhanced mechanical, anticorrosion, and antibacterial characteristics for practical marine applications. The structure and composition of the RGZ composite coatings are tuned to achieve distinct and compact intermetallic alloy layers, leading to improved hardness, wear resistance, friction resistance, electrochemical stability, and antibacterial activity. 0.3 wt %-RGZ composite coating with the highest R ct value (367.8 Ω cm2) exhibits the least corrosion rate (0.75 mmpy) as compared to the other compositions of the developed coatings. All the RGZ composite coatings exhibit enhanced antibacterial activity in different bacterial suspensions selected for the present study (Escherichia coli, Bacillus subtilis, and seawater consortium), and the 0.3 wt %-RGZ composite coating is demonstrated to be suitable for marine applications with the lowest bacterial survivability (20.3%) in the seawater consortium. The electrochemical stability and anticorrosion performance of the 0.3 wt %-RGZ composite coating even after long-term exposure (28 days) to seawater consortium confirmed from the largest R ct value (1154.7 Ω cm2) and the least i corr value (223.4 μA/cm2) indicate its suitability for practical application with excellent reusability. The enhanced antibacterial activity of the 0.3 wt %-RGZ composite coating as compared to other compositions of RGZ coatings and bare-Zn coating is attributed to its three-level bacterial destruction capability by inducing damage to the bacterial cell wall through physical damage, penetration of Zn2+ ions, and the activity of the photogenerated reactive oxygen species (ROS). The enhanced antibacterial activity and excellent electrochemical stability with attractive anticorrosion performance of 0.3 wt %-RGZ composite coating even after long-term exposure (28 days) in different bacterial suspensions, especially in seawater consortium, confirm its suitability for practical applications.

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Section: Ospmentioning

confidence: 55%

Section: Resultsmentioning

confidence: 99%

Section: Tuning Of Electrochemical Characteristics Of the Developed R...mentioning

confidence: 86%

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Multifunctional rGO–ZnO Composite Coatings with Enhanced Mechanical, Anticorrosion, and Antibacterial Characteristics for Practical Applications

Geethanjali,

Elias,

Bijimol

et al. 2023

ACS Appl. Eng. Mater.

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“…Alumina is a high-performance structural material that can be incorporated into metal and/or ceramic matrices to enhance its mechanical properties, [16][17][18] wear resistance, [19] and oxidation resistance. [20][21][22] Lu et al [20] prepared a TaC-Al 2 O 3 composite with Al 2 O 3 contents ranging from 10 to 40 vol%.…”

Section: Introductionmentioning

confidence: 99%

Atomic Scale Insight into the Oxidation Mechanism of Nb/Ta‐Doped Ti₃SiC₂/Al₂O₃ Ceramics

Li,

Gao,

2024

Adv Eng Mater

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The low oxidation resistance of Ti3SiC2/Al2O3 composites limits their applications as high‐temperature structural materials. To improve the oxidation resistance, Nb and Ta were introduced into the substrate in this study. The Nb/Ta‐doped Ti3SiC2/Al2O3 composite showed superior oxidation resistance than clean Ti3SiC2/Al2O3 following the oxidation process at 800–1000 °C for 100 h. The oxidation mechanism was determined via first‐principles calculations. The oxidation process of the composite was controlled by the inward diffusion of O and outward diffusion of Ti. When Nb/Ta elements are doped, their larger atomic radii and stronger binding produce a higher diffusion barrier for O and Ti atoms, which prevents element migration and reduces the thickness of the oxidation layers.This article is protected by copyright. All rights reserved.

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“…Modification of phosphate conversion coating by incorporation of metal oxide has been helpful in further improving the tribological properties of metallic surfaces. Riyas et al 43 synthesized zinc-phosphate coatings with Al 2 O 3 /Mo modifier on galvanized steel. Synergistic action of Al 2 O 3 /Mo composite matrix and zinc-phosphate crystals reduced friction and wear.…”

Section: Introductionmentioning

confidence: 99%

Dry sliding wear behavior of hard-chrome and zinc-phosphate conversion coatings on steel substrates

Kumar,

Rachwani,

Kumar Singh

2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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We have studied tribological properties of conversion coatings, hard chrome on AISI 430 stainless steel, and zinc phosphate on AISI 1044 carbon steel. These substrates were chosen due to their extensive industrial applications. The goal of the present study is to improve the wear resistance of these substrates through the coatings. We performed nano-indentation and ball-on-disc tribometer experiments to study mechanical and tribological behavior of substrates and coatings. We find that when zinc-phosphate coating is applied to AISI 1044 steel, a new phase Zn2Fe(PO4)2·4H2O (phosphophyllite) is formed on the surface that increases the surface hardness. We further find that coefficient of friction decreases approximately by 8% due to hard-chrome coating on AISI 430 steel and by 48% due to zinc-phosphate coating on AISI 1044 steel under load and speed conditions applied in the present study. We attribute our findings to formation of: (1) an adhering layer of chromium in the case of chrome–steel contact, leading to chrome–chrome contact at the interface of test-specimen and counter-surface, and (2) a glossy layer at interface in the case of phosphate-steel contact, owing to the compaction and crushing of phosphate wear debris. Our wear studies show maximum reductions in specific wear rate to be around 80% and 89% for chrome and zinc-phosphate coatings, respectively. We note that adhesion and abrasion are the primary modes of wear for chrome and zinc-phosphate conversion coatings, respectively at the initial stage. However, adhesive wear switches to delamination wear at a later stage for hard-chrome coating.

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Exploration and tuning of Al2O3/Mo composite for enhancement of anti-corrosion and tribological characteristics in zinc phosphate conversion coatings

Cited by 26 publications

References 91 publications

Multifunctional rGO–ZnO Composite Coatings with Enhanced Mechanical, Anticorrosion, and Antibacterial Characteristics for Practical Applications

Multifunctional rGO–ZnO Composite Coatings with Enhanced Mechanical, Anticorrosion, and Antibacterial Characteristics for Practical Applications

Atomic Scale Insight into the Oxidation Mechanism of Nb/Ta‐Doped Ti₃SiC₂/Al₂O₃ Ceramics

Dry sliding wear behavior of hard-chrome and zinc-phosphate conversion coatings on steel substrates

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Exploration and tuning of Al2O3/Mo composite for enhancement of anti-corrosion and tribological characteristics in zinc phosphate conversion coatings

Cited by 26 publications

References 91 publications

Multifunctional rGO–ZnO Composite Coatings with Enhanced Mechanical, Anticorrosion, and Antibacterial Characteristics for Practical Applications

Multifunctional rGO–ZnO Composite Coatings with Enhanced Mechanical, Anticorrosion, and Antibacterial Characteristics for Practical Applications

Atomic Scale Insight into the Oxidation Mechanism of Nb/Ta‐Doped Ti3SiC2/Al2O3 Ceramics

Dry sliding wear behavior of hard-chrome and zinc-phosphate conversion coatings on steel substrates

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Atomic Scale Insight into the Oxidation Mechanism of Nb/Ta‐Doped Ti₃SiC₂/Al₂O₃ Ceramics