Investigation on the corrosion behavior of lanthanum phosphate coatings on AZ31 Mg alloy obtained through chemical conversion technique

Jayaraj, Jithu; Komban, Rajesh; Raj, S. Amruth; Srinivasan, A.; Ananthakumar, S.; Dhaipule, Nanda Gopala Krishna; Kalpathy, Sreeram K.; Pillai, U.T.S.; Mudali, U. Kamachi

doi:10.1016/j.jallcom.2019.01.121

Cited by 40 publications

(11 citation statements)

References 48 publications

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“…Hence it would be ideal to protect the surface with a stable anti‐corrosive coating without compromising on its aesthetic appeal. It has already been shown by Jithu Jayaraj et al that corrosive nature of a coating mainly depends on its morphology, surface defects and stability under a corrosive environment [25] . When the coating develops porosities or cracks, the corrosive medium penetrates the coating through these defects and reaches the surface of the substrate leading to further corrosion [26] .…”

Section: Resultsmentioning

confidence: 99%

“…It has already been shown by Jithu Jayaraj et al that corrosive nature of a coating mainly depends on its morphology, surface defects and stability under a corrosive environment. [25] When the coating develops porosities or cracks, the corrosive medium penetrates the coating through these defects and reaches the surface of the substrate leading to further corrosion. [26] The IR reflective brick red colorant was exclusively designed for heat management coatings, so the electrochemical analysis of the polymer coating of brick red colorant over the metal substrate was carried out in order to study the corrosion resistance potential of the coating.…”

Section: Corrosion Studies Of Brick Red Coatingmentioning

confidence: 99%

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IR Reflective LaPO₄ Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications

Sheemol

Mohamed

Ananthakumar

2021

Chemistry An Asian Journal

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LaPO 4 ceramic colorants were processed in the vibrant shades of green and brick red, and subsequently embedded in polymer resins for the fabrication of heat management coatings. The IR/UV shielding characteristics of these ceramic colorants and polymer coatings were analysed and it was found that the ceramic dispersoids enhance the IR reflectance quality of polymer resins by 20 to 25 times. The nano ceramic green colorant-reinforced polymer coating on glass panels offers the stringent property, i. e., optical transparency and heat reflectance combined, when exposed to direct sunlight. Other photophysical properties were also studied and analysed. The brick red colorant entrenched resin coating on metal substrate offered heat reflectance and corrosion resistance characteristics. XPS studies provided the chemical environment of the systems. Surface morphology, crystallinity and particle size of the products were investigated using SEM, TEM, XRD and DLS techniques. The polymer resin coating of these ceramic colorants offers thermal stability and colorfastness properties.

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Section: Resultsmentioning

confidence: 99%

Section: Corrosion Studies Of Brick Red Coatingmentioning

confidence: 99%

IR Reflective LaPO₄ Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications

Sheemol

Mohamed

Ananthakumar

2021

Chemistry An Asian Journal

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“…The XRD patterns of pure HA and other groups are shown in Figure 5a. Except for the pure HA samples, all the other samples show obvious α-Mg characteristic peaks, which may be attributed to the porous properties of the coatings [49]. Of course, in the AZ31/CMC-DA group, the characteristic peak of α-Mg was significantly reduced due to the coverage of the composite hydrogel.…”

Section: Analysis Of Cmc-damentioning

confidence: 94%

Preparation and Characterization of Hydroxyapatite Coating on AZ31 Magnesium Alloy Induced by Carboxymethyl Cellulose-Dopamine

Yang

Wei

et al. 2021

Materials

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Magnesium and its alloys have become potential implant materials in the future because of light weight, mechanical properties similar to natural bone, good biocompatibility, and degradability in physiological environment. However, due to the rapid corrosion and degradation of magnesium alloys in vivo, especially in the environment containing chloride ions, the application of magnesium alloys as implant materials has been limited. Therefore, improving the corrosion resistance of magnesium alloy and ensuring good biocompatibility is the main focus of the current research. In this study, hydroxyapatite coating was prepared on magnesium alloy surface using carboxymethyl cellulose-dopamine hydrogel as inducer to improve corrosion resistance and biocompatibility. Surface characterization techniques (scanning electron microscopy, Fourier-transformed infrared spectroscopy, energy dispersive X-ray spectroscopy- and X-ray diffraction) confirmed the formation of hydroxyapatite on the surface of AZ31 alloy. Corrosion resistance tests have proved the protective effect of Carboxymethyl cellulose-Dopamine/hydroxyapatite (CMC-DA/HA) coating on the surface of AZ31 alloy. According to MC3T3-E1 cell viability and Live/Dead staining, the coating also showed good biocompatibility. The results will provide new ideas for the biological application of magnesium alloys.

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“…Plenty of techniques have been investigated on surface treatments of Mg alloys, such as physical coating [14,15], chemical conversion [16,17], micro-arc oxidation (MAO) or plasma electrolyte oxidation [18], ionic liquid [19], sol-gel [20] and layer-by-layer assembly [21]. Nevertheless, these coatings require multiple steps, special processing conditions and time-, energy-and cost-consuming [11].…”

Section: Introductionmentioning

confidence: 99%

Corrosion Resistance and Durability of Superhydrophobic Coating on AZ31 Mg Alloy via One-Step Electrodeposition

Yin

Zhang

Tian

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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To enhance durability and adhesion of superhydrophobic surface, an integrated superhydrophobic calcium myristate (Ca[CH 3 (CH 2 ) 12 COO] 2 ) coating with excellent corrosion resistance was fabricated on AZ31 magnesium (Mg) alloy via one-step electrodeposition process. Field-emission scanning electron microscopy, Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy as well as X-ray diffraction were employed to investigate the surface characteristics (morphology, composition and structure) of the coatings. Hydrophobicity of the coating was evaluated by means of contact and sliding angles. Additionally, potentiodynamic polarization, electrochemical impedance spectroscopy and hydrogen evolution tests were conducted to characterize the corrosion resistance. Results indicated that the coating exhibited super-hydrophobicity with large static water contact angle (CA) and small sliding angle of 155.2° ± 1.5° and 6.0° ± 0.5°, respectively, owing to spherical rough structure and low surface energy (7.01 mJ m −2 ). The average hydrogen evolution rate (HER a ) and corrosion current density (i corr ) of the coated sample were 5.3 μL cm −2 h −1 and 5.60 × 10 −9 A cm −2 , about one and four orders of magnitude lower than that of AZ31 substrate, respectively, implying the excellent corrosion resistance. The CA of the coating remained 155.6° ± 0.9° after soaking for 13 days, showing the super-hydrophobicity and stability of the coating. Simultaneously, the large critical load (5004 mN) for the coating designated the outstanding adhesion to the substrate by nano-scratch test.

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Investigation on the corrosion behavior of lanthanum phosphate coatings on AZ31 Mg alloy obtained through chemical conversion technique

Cited by 40 publications

References 48 publications

IR Reflective LaPO₄ Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications

IR Reflective LaPO₄ Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications

Preparation and Characterization of Hydroxyapatite Coating on AZ31 Magnesium Alloy Induced by Carboxymethyl Cellulose-Dopamine

Corrosion Resistance and Durability of Superhydrophobic Coating on AZ31 Mg Alloy via One-Step Electrodeposition

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Investigation on the corrosion behavior of lanthanum phosphate coatings on AZ31 Mg alloy obtained through chemical conversion technique

Cited by 40 publications

References 48 publications

IR Reflective LaPO4 Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications

IR Reflective LaPO4 Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications

Preparation and Characterization of Hydroxyapatite Coating on AZ31 Magnesium Alloy Induced by Carboxymethyl Cellulose-Dopamine

Corrosion Resistance and Durability of Superhydrophobic Coating on AZ31 Mg Alloy via One-Step Electrodeposition

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Product

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IR Reflective LaPO₄ Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications

IR Reflective LaPO₄ Ceramic Colorant Reinforced Polymer Composite Coatings on Glass and Metal Substrates for Heat Management Applications