Corrosion Resistance of Silane-Modified Hydroxyapatite Films on Degradable Magnesium Alloys

doi:10.1007/s40195-017-0601-8

Abstract

Abstract:

A polymethyltrimethoxysilane (PMTMS)/hydroxyapatite (HA) hybrid coating was successfully fabricated on a magnesium alloy by hydrothermal treatment and immersion method. The microstructure and composition of the coating were characterized by using X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. The physical properties were investigated using scratch testing. At the same time, the corrosion resistance was evaluated via electrochemical and immersion tests. The results demonstrated that the corrosion resistance of the silane hybrid coating was significantly enhanced compared with the naked magnesium alloy. Especially, the corrosion current density of the PMTMS/HA magnesium alloy was three orders of magnitude lower than that of the bare material.

Key words: Magnesium alloys, Silane, Hydroxyapatite, Corrosion resistance, Biomaterial

Yan-Bin Zhao, Li-Qian Shi, Lan-Yue Cui, Chang-Lei Zhang, Shuo-Qi Li, Rong-Chang Zeng, Fen Zhang, Zhen-Lin Wang. Corrosion Resistance of Silane-Modified Hydroxyapatite Films on Degradable Magnesium Alloys[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(2): 180-188.

Figures/Tables 13

Fig. 1 Schematic representation of the preparation of PMTMS/HA coating

Fig. 2 XRD patterns of the AZ31 substrate a, the HA b and the PMTMS/HA c films

Fig. 3 FTIR patterns of the HA a and the PMTMS/HA b films

Fig. 4 Surface morphologies and the corresponding EDS spectra of the HA a, b, c and the PMTMS/HA films d, e, f

Fig. 5 Cross-sectional morphology a and the elemental mapping results b, c, d, e of PMTMS/HA film

Fig. 6 Polarization curves of the AZ31 a, the HA coating b and the PMTMS/HA coating c

Table 1 Electrochemical parameters of the polarization curves in HBSS

Sample	E _corr (V/SCE)	I _corr (A/cm²)	B _a (mV/decade)	-b _c (mV/decade)	R _p (Ω cm²)
AZ31	-1.47	1.84 × 10^-5	94.31	231.54	3.76 × 10³
HA/AZ31	-1.39	1.77 × 10^-6	92.62	218.65	3.94 × 10⁴
PMTMS/HA/AZ31	-1.45	3.86 × 10^-8	146.83	256.32	3.87 × 10⁶

Fig. 7 a Nyquist plots and fitting curves, b Bode plots and c Bode plots of the phase angle versus frequency for bare AZ31 substrate i, HA/Mg film ii and PMTMS/HA film iii, and the corresponding equivalent electric circuits for EIS: d AZ31 substrate, e HA/Mg film, f PMTMS/HA film in HBSS

Table 2 Fitted electrochemical parameters of EIS after various immersion periods

Sample	R _s (Ω cm²)	Q ₁ (Ω^-1 sⁿ/cm²)	N ₁	R _c1 (Ω cm²)	Q ₂ (Ω^-1 sⁿ/cm²)	R _ct (Ω cm²)	C (F/cm²)	R _L (Ω cm²)	L (H cm²)
AZ31	67.82	1.457 × 10^-5	0.86	-	-	852	-	653.4	647.3
HA	64.86	1.264 × 10^-5	0.88	-	9.32 × 10^-4	2826	-	1367	3.279 × 10⁴
PMTMS/HA	42.95	1.183 × 10^-7	0.78	271.82	2.05 × 10^-6	7108	1.42 × 10^-7	9.56 × 10⁵	8.552 × 10⁶

Fig. 8 HERs results of the bare AZ31 a, the HA film b and the PMTMS/HA film c in HBSS for 150 h

Fig. 9 Surface morphologies and the corresponding EDS spectra of the AZ31 a, d, the HA/Mg b, e and the PMTMS/HA/AZ31 c, f immersed in HBSS for 150 h

Fig. 10 XRD patterns of the AZ31 a, the HA/AZ31 b and the PMTMS/HA/AZ31 c immersed in HBSS for 150 h

Fig. 11 Nanoscratch test results of the HA and the PMTMS/HA coating

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