In-situ formation of Zn-MOF coating on MgO/HA composite layer produced by plasma electrolytic oxidation on Mg-Sn-Mn-Ca alloy for orthopedic internal fixation devices

Figures & data

Table 1. Designation of the samples under this study.

Sl. No	Sample Code	Description
1	M	As-cast Mg alloy of composition Mg-5Sn-0.2Mn-0.2Ca
2	M_P	PEO treated Mg alloy in standard electrolyte (KOH − 2 g/l; Na2PO3.10H2O − 5 g/l)
3	MH_P	PEO-treated Mg alloy in the standard electrolyte containing HA particles suspended in it
4	MF_P	PEO treated Mg alloy in standard electrolyte and then coated with Zn-MOF by probe sonication
5	MHF_P	PEO treated Mg alloy in the standard electrolyte containing HA particles suspended in it and then coated with Zn-MOF by probe sonication

Figure 1. SEM micrographs of (a) M_P, (b) MH_P, (c) MF_P, and (d) MHF_P.

Figure 2. SEM-EDS elemental mapping and spectra of MF_P.

Figure 3. EDS elemental mapping and spectra of MHF_P.

Figure 4. Porosity measurements.

Figure 5. Individual surface roughness profiles and average roughness parameters of M_P, MH_P, MF_P, MHF_P.

Figure 6. Microhardness.

Figure 7. Tafel plots of M, M_P, MH_P, MF_P, and MHF_P.

Table 2. Electrochemical parameters of the samples derived from Tafel extrapolation.

Sample	Corrosion rate (mpy)	icorr (µA)	Ecorr (V)
M	35.44	14.70	−1.520
M_P	3.410	1.410	−1.480
MH_P	34.28e-3	0.5240	−0.684
MF_P	69.56e-3	0.2890	−0.271
MHF_P	126.3e-3	0.1420	−0.532

Figure 8. Weight loss/gain & pH measurements.

Figure 9. XRD of MHF_P and MHF_P after 7 days of immersion in SBF.

Figure 10. FT-IR spectra of MHF_P and MHF_ P after 7 days of immersion in SBF.

Figure 11. SEM micrographs showing bioactivity of (a) MF_P, and (b) MHF_P after 14 days of immersion in SBF.

Data availability statement

The surface roughness data for some samples are provided in the link below.https://github.com/radha8vit/Experimental-data.git

The remaining data will be available made on request.