Novel PA encapsulated PCL hybrid coating for corrosion inhibition of biodegradable Mg alloys: A triple triggered self-healing response for synergistic multiple protection

Grewal, Navdeep Singh; Batra, Uma; Kumar, Kaushal; Mahapatro, Anil

doi:10.1016/j.jma.2023.01.019

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…The degradation of Mg-alloy occurs when it comes in contact with SBF, leading to a series of reactions as illustrated in figures 12 (a), (b). After immersion in SBF, Mg-alloy forms a passive layer of Magnesium hydroxide and hydrogen is evolved as illustrated in equation (6). The passive layer is attacked by chloride ions (Cl − ) present in the SBF, therefore Mg(OH) 2 is transformed into MgCl 2 (equation ( 7) and Mg + ions get dissolved into the solution.…”

Section: Loss Of Compressive Strength and Calculation Of Degradation ...mentioning

confidence: 99%

“…Magnesium is the fourth most abundant mineral in the human body, playing a crucial role in biochemical reactions that lead to bone and tissue regeneration. Despite its benefits, the high degradation rate and excessive release of hydrogen limit the applications of Mg in implant development [4][5][6]. However, rapid advancement in alloying and surface modification has allowed researchers to modify the corrosion behaviour of Mg-alloys to reduce the mismatch with that of bone healing rate [2,7].…”

Section: Introductionmentioning

confidence: 99%

“…Hayashi [18] demonstrated the benefit of emery paper polishing in improving the fatigue strength of electro-polished and shot-peened 304 stainless steel. Grewal et al [6] has also illustrated the improvement of corrosion resistance of ZM21 using polishing over the asmachined surface. Mechanical polishing of Mg alloys using emery paper removes surface material at the nanoscale through abrasive action from silica and alumina crystals.…”

Section: Introductionmentioning

confidence: 99%

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Influence of surface polishing on the degradation behavior of biodegradable Magnesium alloy

Kumar,

Jain,

Kumar

et al. 2023

Eng. Res. Express

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Mechanical polishing can significantly improve the surface integrity of Mg alloys to reduce the corrosion rate (CR) by minimizing the galvanic corrosion sites. In this study, an emery-polishing attachment on a lathe machine has been used for surface polishing of as-turned cylindrical ZM21 Mg alloy. Using Taguchi’s L9 orthogonal array, three process variables with three levels were investigated and optimized for minimum surface roughness (Ra and Rz values) of Mg-alloy samples. The minimum surface roughness values of Ra; 195 nm and Rz; 1481 nm were obtained corresponding to emery paper (EP) grade; 2000, rotational speed; 250 rpm, and polishing time; 2 min. An in-vitro immersion study was conducted in simulated body fluid (SBF) up to 28 days to investigate the degradation behavior of as-turned and as-polished Mg alloy samples. In-vitro study showed that the as-turned samples (surface roughness; Ra: 640nm, Rz: 4640 nm) had a higher degradation rate (CR: 3.9 mm/year after 28 days) with a higher volume of H2 evolution rate, whereas the polished sample with the minimum surface roughness (Ra: 195 nm, Rz: 1481 nm) exhibited lower weight loss, H2 release rate, degradation rate (CR: 0.95 mm/year after 28 days) and minimum loss of mechanical strength. Based on the present study, polishing is recommended as a secondary operation after the machining of Mg alloy to reduce the corrosion rate for biodegradable implant applications.

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Section: Loss Of Compressive Strength and Calculation Of Degradation ...mentioning

confidence: 99%