“…5 c, the phase angle of the modified samples is higher than that of Mg in the high-frequency region. This finding indicates that an anti-corrosion passivation film completely covered the surface of Mg [ 25 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Many strategies have been performed to regulate the anti-corrosion performance of Mg-based alloys; these strategies include structure design [ 22 , 23 ], surface modification [ [24] , [25] , [26] , [27] , [28] ], and metallurgical alloying [ 29 , 30 ]. For example, an increased cooling rate of an alloy improves the grain refinement in and the formation of α-Mg phase, hence enhance the anti-corrosion performance of the alloy [ 31 ].…”
A PLGA/Ti
3
C
2
hybrid coating was successfully deposited on the surface of magnesium-strontium (Mg-Sr) alloys. Compared with the corrosion current density (
i
corr
) of the Mg-Sr alloy (7.13 × 10
−5
A/cm
2
), the modified samples (Mg/PLGA/Ti
3
C
2
) was lower by approximately four orders of magnitude (7.65 × 10
−9
A/cm
2
). After near infrared 808 nm laser irradiation, the
i
corr
of the modified samples increased to 3.48 × 10
−7
A/cm
2
. The mechanism is that the local hyperthermia induced the free volume expansion of PLGA, and the increase in intermolecular gap enhanced the penetration of electrolytes. Meanwhile, the cytotoxicity study showed that the hybrid coating endowed the Mg-Sr alloy with enhanced biocompatibility.
“…5 c, the phase angle of the modified samples is higher than that of Mg in the high-frequency region. This finding indicates that an anti-corrosion passivation film completely covered the surface of Mg [ 25 ]. Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Many strategies have been performed to regulate the anti-corrosion performance of Mg-based alloys; these strategies include structure design [ 22 , 23 ], surface modification [ [24] , [25] , [26] , [27] , [28] ], and metallurgical alloying [ 29 , 30 ]. For example, an increased cooling rate of an alloy improves the grain refinement in and the formation of α-Mg phase, hence enhance the anti-corrosion performance of the alloy [ 31 ].…”
A PLGA/Ti
3
C
2
hybrid coating was successfully deposited on the surface of magnesium-strontium (Mg-Sr) alloys. Compared with the corrosion current density (
i
corr
) of the Mg-Sr alloy (7.13 × 10
−5
A/cm
2
), the modified samples (Mg/PLGA/Ti
3
C
2
) was lower by approximately four orders of magnitude (7.65 × 10
−9
A/cm
2
). After near infrared 808 nm laser irradiation, the
i
corr
of the modified samples increased to 3.48 × 10
−7
A/cm
2
. The mechanism is that the local hyperthermia induced the free volume expansion of PLGA, and the increase in intermolecular gap enhanced the penetration of electrolytes. Meanwhile, the cytotoxicity study showed that the hybrid coating endowed the Mg-Sr alloy with enhanced biocompatibility.
“…The elevated temperatures associated with the formation of PEO–LDH composite coatings would lead to a mismatch between the dissolution of PEO layers and the growth of Mg–Al LDH film [ 84 , 85 , 86 , 87 , 88 , 89 ]. This deficiency would restrict the large improvement in the protective properties of these materials.…”
Section: Corrosion Performance Of Ldh/anodic Film Compositesmentioning
This review presents an overview of the recent developments in the synthesis of layered double hydroxide (LDH) on the anodized films of Mg alloys prepared by either conventional anodizing or plasma electrolytic oxidation (PEO) and the applications of the formed composite ceramics as smart chloride traps in corrosive environments. In this work, the main fabrication approaches including co-precipitation, in situ hydrothermal, and an anion exchange reaction are outlined. The unique structure of LDH nanocontainers enables them to intercalate several corrosion inhibitors and release them when required under the action of corrosion-relevant triggers. The influences of different variables, such as type of cations, the concentration of salts, pH, and temperature, immersion time during the formation of LDH/anodic film composites, on the electrochemical response are also highlighted. The correlation between the dissolution rate of PEO coating and the growth rate of the LDH film was discussed. The challenges and future development strategies of LDH/anodic films are also highlighted in terms of industrial applications of these materials.
“…Layered double hydroxides (LDHs), which are widely applied in industry and have attracted significant research interest, were fabricated as coatings for corrosion protection in the last decade to mimic the self-repairing behavior of traditional Cr conversion films by utilization of their good ion exchangeability [19,20]. As affinities of anions for LDH intercalation differ, aggressive ions can be trapped into the interlayers, whereas intercalated anions are released and serve as inhibitors that increase the corrosion protection of the LDH coating [20,21]. The released anions may react with the Mg 2+ that results from the oxidation of Mg alloys, thereby filling the corroded sites by producing compact and stable depositions, modifying the defects, decreasing the aggressiveness of the environment, and showing a self-healing ability [22,23].…”
Section: Introductionmentioning
confidence: 99%
“…Results of EPMA-WDS mapping analysis showing the elemental distribution of C, N, S, O, and Mg on the surface of NTA@MgAl-LDH coating.Electrochemical tests, including EIS and potentiodynamic polarization curves, were obtained to estimate the corrosion resistance of the different samples[48][49][50][51]. Generally, a higher value of impedance modulus at lower frequency means greater improvement in the corrosion resistance of the coating[21,22,52,53]. Obviously, the MgAl-LDH coating shows a much higher modulus at low frequencies thaan Mg alloy(Figure 6a).…”
A new thiophene derivative corrosion inhibitor (CI) was used to functionalize the layered double hydroxide (LDH) primer on Mg alloy to enhance corrosion protection. Compared with bare LDH coating, the composite coatings consisting of a MgAl-LDH primer and an outer CI layer showed highly compact surface structures without large pores and gaps, thereby indicating the enhanced capability to resist the penetration of corrosive species. Eelectrochemical tests revealed that the MgAl-LDH film modified with the newly synthesized CI exhibited higher charge transfer resistance and lower corrosion current density than films modified with commercial CIs. The highest enhancement in corrosion resistance was linked to the film's ability to repair physical damage by forming precipitates through chemical complexation and adsorption of the CIs. These findings open up new opportunities for the design and synthesis of a thiophene-contained inhibitor to modify LDH films and to obtain a composite coating with superior corrosion protection.
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