The influence of aluminum tri-polyphosphate on the protective behavior of Mg-rich epoxy coating on AZ91D magnesium alloy

Lu, Xiangyu; Zuo, Yu; Xin, Zhao; Tang, Yuming

doi:10.1016/j.electacta.2013.01.078

Cited by 51 publications

(34 citation statements)

References 48 publications

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“…The corrosion rate of the SAP-MRP coated sample was about 1.32 × 10 −9 A cm −2 . Similar to the polarization results in NaCl solution [15,19], the MRP with or without aluminum tri-polyphosphate could cathodically polarize the AZ91D substrate for about 100 mV. According to our previous calculation, the anodic dissolution reaction of the AZ91D substrate could be reduced to 6.60% [15].…”

Section: Ocp Measurementssupporting

confidence: 76%

“…As the immersion time was prolonged, the radius of the capacitive loop and the |Z| 0.01 Hz of MRP showed an increase while the phase angles decreased. The phenomenon is ascribed to formation of the corrosion products of the Mg particles in MRP, providing barrier protection to some extent [14,15,19]. Nevertheless, after immersion from 72 to 297 days, the EIS of MRP almost remained the same and the |Z| 0.01 Hz value declined slowly, reflecting that the protective performance of the MRP persisted without remarkable deterioration.…”

Section: Ocp Measurementsmentioning

confidence: 98%

“…in which Y 0 is the CPE constant, j = √ − 1, f is the frequency (Hz), n = α/(π/2) and α is the phase angle of the CPE (radians). samples dropped dramatically because of the electrolyte permeation into the primers and the activation of Mg particles [14,15,19]. Next, the |Z|0.01 Hz values of the MRP began to rise, which is attributed to the precipitation corrosion products of Mg particles in the primer, leading to the improvement of the barrier effect.…”

Section: Eis Measurementmentioning

confidence: 99%

“…in which Y0 is the CPE constant, j = √ − 1, f is the frequency (Hz), n = α/(π/2) and α is the phase angle of the CPE (radians). The EECs ( Figure 5) were adopted to fit the EIS spectra of MRP on AZ91D alloys in previous studies [14,15,18,19]. Here, Q c and R c are the coating capacitance and coating resistance, respectively.…”

Section: Eis Measurementmentioning

confidence: 99%

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Investigation of Protective Performance of a Mg-Rich Primer Containing Aluminum Tri-Polyphosphate on AZ91D Magnesium Alloy in Simulated Acid Rain

Sun

Fan

et al. 2019

Coatings

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Mg-rich primer (MRP) containing aluminum tri-polyphosphate functions via a galvanic mechanism to protect AZ91D alloy from corrosion in the 3 wt % NaCl solution. However, its protective performance can be strongly affected by the testing environment. Therefore, it is important to investigate the performance of the primer on magnesium alloys in an acid rain environment. In the present study, the protective performance of MRP with or without aluminum tri-polyphosphate was investigated via open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), scanning electronic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) in the simulated acid rain. Compared to the primer without aluminum tri-polyphosphate, the MRP containing aluminum tri-polyphosphate pigments exhibited better protective performance in the simulated acid rain condition. In the initial stage, the acidic condition prompted the aluminum tri-polyphosphate pigments to release phosphates and H+ to form magnesium phosphates on Mg particles, retarding their consumption rate. The Mg-rich primer with aluminum tri-polyphosphate can provide cathodic protection to AZ91D alloy for about 49 days in the simulated acid rain solution. Simultaneously, the corrosion products of Mg particles, magnesium oxides and phosphates, precipitated on the Mg particles and improved the stability of the primer. In addition, a protective film, consisting of magnesium oxides and phosphates, formed on the AZ91D substrate. Consequently, all these factors contributed to the long cathodic protection and improved corrosion resistance of MRP containing aluminum tri-polyphosphate in the simulated acid rain.

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Section: Ocp Measurementssupporting

confidence: 76%

Section: Ocp Measurementsmentioning

confidence: 98%

Section: Eis Measurementmentioning

confidence: 99%

Section: Eis Measurementmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Protective Performance of a Mg-Rich Primer Containing Aluminum Tri-Polyphosphate on AZ91D Magnesium Alloy in Simulated Acid Rain

Sun

Fan

et al. 2019

Coatings

Self Cite

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“…[3][4][5][6] One of the important alternatives is ADTP. [7][8][9] However, ADTP belongs to the solid acid group of compounds, 1,2 and therefore is usually considered to be less effective in the most widely used amine--cured epoxy coatings due to the reaction between ADTP and the amine hardeners and further to inferior storage stability. Several strategies have been developed to improve the performance of ADTP.…”

Section: Introductionmentioning

confidence: 99%

Effect of gamma-irradiation on the properties of aluminum dihydrogen triphosphate

Song

et al. 2017

JSCS

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The effect of gamma irradiation on the properties of aluminum dihydrogen triphosphate (ADTP) in the dose range of 0 to 150 kGy was studied by X-ray diffraction (XRD) analysis, thermal analysis, acid-base titration, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Although the XRD and SEM results indicated that there were no significant effects on the crystal structure and the surface morphology of ADTP, thermal analysis revealed that the crystal transition of Al(PO 3) 3 from Type-B to Type-A did not occur at a high temperature in irradiated ADTP. EIS results showed that high-dose gamma irradiation (100 kGy and 150 kGy, 60 Co) improved the corrosion inhibition ability of ADTP on tinplate steel. SEM was used to investigate the surface of tinplate steel panels after immersion in ADTP extracts for 69 h, and revealed that many slices were formed on the surface. The slices were attributed to the formation of Fe 2 P 3 O 10. Inter-slice gaps may be the reason for the lower corrosion resistance of ADTP compared with the resistance of some toxic pigments containing lead and chromium. Overall, high doses of gamma irradiation improved the corrosion resistance of ADTP.

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An Impact of the Recent Developments in Coating Materials and Techniques on the Corrosion Response of AZ91D Alloy: A Review

et al. 2023

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AZ91D, a die‐casted alloy, offers several benefits (better saltwater corrosion resistance, suitable castability, and good atmospheric stability) over other grades of magnesium alloy. However, it cannot overcome the challenging requirements of advanced applications in its current form. Extensive research in coating technologies is crucial in enhancing the performance of AZ91D alloy in highly corrosive environments (coastal and marine, industrial, farm, etc.). The high corrosion resistance of AZ91D for various applications is achievable through the deposition of different materials. Developments in coating materials and techniques, with their influence on the corrosion protection behavior of AZ91D alloy, over the last decade (2012–2022), are focused on in this study. It is observed that composite, biodegradable, and self‐healing coatings are gaining popularity. The transition in the coating technology, from conventional to self‐healing coating materials and from conventional to environment‐friendly coating techniques, is a vital part of this discussion. This review further explores how different additives, pre‐treatments, post‐treatments, and corrosion inhibitors affect the corrosion performance of coatings. This study helps select the optimum coating material for AZ91D magnesium alloy to fulfil a specific application requirement and guides toward technological developments in this segment.

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The influence of aluminum tri-polyphosphate on the protective behavior of Mg-rich epoxy coating on AZ91D magnesium alloy

Cited by 51 publications

References 48 publications

Investigation of Protective Performance of a Mg-Rich Primer Containing Aluminum Tri-Polyphosphate on AZ91D Magnesium Alloy in Simulated Acid Rain

Investigation of Protective Performance of a Mg-Rich Primer Containing Aluminum Tri-Polyphosphate on AZ91D Magnesium Alloy in Simulated Acid Rain

Effect of gamma-irradiation on the properties of aluminum dihydrogen triphosphate

An Impact of the Recent Developments in Coating Materials and Techniques on the Corrosion Response of AZ91D Alloy: A Review

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