Sodium Phosphate Post-treatment on Al Coating: Morphological and Corrosion Study

Jeong, Hwa-Rang; Lee, Han-Seung; Jalalzai, Palwasha; Kwon, Seung-Jun; Singh, Jitendra Kumar; Hussain, Raja Rizwan; Alyousef, Rayed; Alabduljabbar, Hisham; Aslam, Fahid

doi:10.1007/s11666-019-00921-w

Cited by 14 publications

(17 citation statements)

References 51 publications

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“…The average thickness of AC and SPCN1 was found to be 100 ± 5 µm whereas SPCN2 and SPCN3 were found to be 110 and 140 ± 5 µm, respectively, attributed to the deposition of composite oxide after treatment. The average bond adhesion value of the coatings was 4.86 ± 0.08 MPa for four consecutive samples [19,31,[33][34][35].…”

Section: Coating Thickness and Bond Adhesion Analysismentioning

confidence: 99%

“…After the treatment of samples, they were kept for drying at 25 ± 1 • C up to 24 h in laboratory. After drying, the samples were subsequently kept in a humidity chamber for 7 days at 50 • C and 95% relative humidity for the formation of natural oxides [33][34][35]. It is well known that when the coating is exposed to harsh atmospheric conditions where humidity and temperature are very high, there will be a probability of forming natural oxide.…”

Section: Treatment Of the Coatingsmentioning

confidence: 99%

“…When the coating was treated with SPCN1 ( Figure 1b) solution, it exhibits filamentous and clusters of needle particles. However, it shows defects and non-homogenous deposition owing to the lower concentration of NaH 2 PO 4 solution [35]. The influential effect of 0.1 M Ca(NO 3 ) 2 is observed when it was mixed with NaH 2 PO 4 [34].…”

Section: Scanning Electron Microscopy (Sem) Of the Coatingsmentioning

confidence: 99%

“…It was reported that 0.1 M ammonium phosphate post-treated Al coating provides good corrosion resistance but once the amount was increased, it shows deterioration owing to the acidic in nature of treated film [33]. It was observed by Lee and Singh that when 0.1 M Ca(NO 3 ) 2 was added in 1 M ammonium phosphate, the corrosion resistance of Al coating was increased dramatically attributed to the formation of gypsum and aluminum phosphate in corrosion products [34].Recently we have published the work on post-treatment of Al coating with sodium phosphate mono basic (SP-NaH 2 PO 4 ) and found that this treatment was very susceptible to corrosion in artificial ocean water solution owing to the formation of crack and acidic film [35]. Thus, it is our prudent thought to treat the Al coating using different concentrations of SP solution with the addition of 0.1 M calcium nitrate [Ca(NO 3 ) 2 ] and study the synergistic effect of Ca(NO 3 ) 2 on morphology as well as corrosion characteristics of treated coatings at a longer duration of exposure in 3.5 wt.% NaCl solution.…”

mentioning

confidence: 99%

“…Recently we have published the work on post-treatment of Al coating with sodium phosphate mono basic (SP-NaH 2 PO 4 ) and found that this treatment was very susceptible to corrosion in artificial ocean water solution owing to the formation of crack and acidic film [35]. Thus, it is our prudent thought to treat the Al coating using different concentrations of SP solution with the addition of 0.1 M calcium nitrate [Ca(NO 3 ) 2 ] and study the synergistic effect of Ca(NO 3 ) 2 on morphology as well as corrosion characteristics of treated coatings at a longer duration of exposure in 3.5 wt.% NaCl solution.…”

mentioning

confidence: 99%

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Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

et al. 2020

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Aluminum coating was deposited by arc thermal spraying process onto the steel substrate for the corrosion protection in aggressive environment. However, the arc thermal sprayed coating possesses defects in the coating. Thus, it is important to reduce the defects and enhance the corrosion resistance properties of the deposited coating using post-treatment. In the present study, we have used different concentrations of sodium phosphate mono basic (NaH2PO4) with 0.1 molar (M) calcium nitrate [Ca(NO3)2] as post-treatment solution to fill out the defects of the Al coating. It was observed by scanning electron microscopy (SEM) that 1 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample exhibited 71% reduction in defects compared to as coated samples. X-ray diffraction (XRD) was performed to determine the phases formed on the coating surface after treatments. XRD confirms the formation of sodium aluminum hydrogen phosphate (Na3Al(OH)(HPO4)(PO4)) and brushite (Ca(HPO4)(H2O)2) as composite oxides on the Al coating. Electrochemical results show that 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample has exhibited the highest charge transfer resistance and the lowest corrosion current density after 89 days of exposure in 3.5 wt.% NaCl solution. The enhancement in corrosion resistance of 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample attributed to the formation of adherent, sparingly soluble, and stable corrosion products. The volume fraction result of the corrosion products formed on 0.5 M NaH2PO4 with 0.1 M Ca(NO3)2 treated sample after 89 days of exposure in 3.5 wt.% NaCl using XRD confirms the highest amount of Bayerite (α-Al(OH)3) deposition, thus, the corrosion rate of this sample was the lowest.

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Section: Coating Thickness and Bond Adhesion Analysismentioning

confidence: 99%

Section: Treatment Of the Coatingsmentioning

confidence: 99%

Section: Scanning Electron Microscopy (Sem) Of the Coatingsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

et al. 2020

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Study on corrosion resistance of arc sprayed Zn–xAl (x = 19, 27, and 37) pseudo alloy coatings in salt spray environment

Zhang,

Wang,

et al. 2024

Materials & Corrosion

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To study the corrosion behavior of Zn–Al pseudo alloy coatings with different Al contents, Zn–xAl (x = 19, 27, and 37) pseudo alloy coatings were prepared by the wire arc spraying technique using Zn and Al wires with different diameters. This study investigated the microstructure, electrochemical corrosion behavior, and corrosion morphology and products of the as‐sprayed coatings after the salt spray test in 5 wt% NaCl solution. The results exhibited that the Zn–Al pseudo alloy coatings with higher Al content form denser corrosion products (Zn5(OH)8Cl2·H2O and Zn–Al layered double hydroxide) with stronger self‐shielding effect against corrosive media, thus provide better long‐term corrosion protection. Besides, electrochemical reactions are controlled by mass transfer until corrosion for 24 h, and then by a combination of mass transfer and diffusion for 96 h. Overall, it can be concluded that the Zn–37Al pseudo alloy coating in this study shows great potential to protect steel substrates from corrosion.

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Corrosion Behavior of Arc-Sprayed Pore-Sealed Zn and Al Coatings in Seawater Containing Sulfate-Reducing Bacteria (SRB)

Qiao

Duan

et al. 2021

J Therm Spray Tech

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Sodium Phosphate Post-treatment on Al Coating: Morphological and Corrosion Study

Cited by 14 publications

References 51 publications

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

Effect of Sodium Phosphate and Calcium Nitrate Sealing Treatment on Microstructure and Corrosion Resistance of Wire Arc Sprayed Aluminum Coatings

Study on corrosion resistance of arc sprayed Zn–xAl (x = 19, 27, and 37) pseudo alloy coatings in salt spray environment

Corrosion Behavior of Arc-Sprayed Pore-Sealed Zn and Al Coatings in Seawater Containing Sulfate-Reducing Bacteria (SRB)

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