Inhibition of Corrosion of Magnesium in Chromic Acid

Anticorrosive Self-Assembled Hybrid Alkylsilane Coatings for Resorbable Magnesium Metal Devices

“…Smooth surface morphology and homogeneity of AS coatings are important factors in the reduction of corrosion. − Furthermore, the lamellar nanostructure of the AS films with alternating hydrophobic alkyl and covalently bound polysiloxane layers can provide an effective barrier for the solution access to the implant surface. We have assessed anticorrosive properties of the AS coatings by three independent methods commonly used in the corrosion research, namely, hydrogen evolution, ,, weight loss, ,, and potentiodynamic polarization. − The results obtained by the three independent methods agreed extremely well and demonstrated a dramatic decrease in the corrosion rate. In agreement with the corrosion studies, our SEM observations of the coated samples revealed that AS layer remained relatively intact after 7 days in SBF and 14 days in cell culture medium.…”

“…It has been reported that a hydroxide conversion layer on Mg surface can slow down initial corrosion. 10,39,65,66 We saw a small but signifficant decrease in corrosion in Mg−OH samples by weight loss and H 2 evolution methods. Interstingly, potentiodynamic polarization experiments did not show any signifficant differences between Mg and Mg-OH in both E corr and I corr .…”

“…49−51 Furthermore, the lamellar nanostructure of the AS films with alternating hydrophobic alkyl and covalently bound polysiloxane layers can provide an effective barrier for the solution access to the implant surface. We have assessed anticorrosive properties of the AS coatings by three independent methods commonly used in the corrosion research, namely, hydrogen evolution, 37,52,53 weight loss, 39,54,55 and potentiodynamic polarization. 56−58 The results obtained by the three independent methods agreed extremely well and demonstrated a dramatic decrease in the corrosion rate.…”

“…Weight Loss Analysis. The mass loss analysis after 7 days of degradation in SBF at room temperature was performed according to ASTM G1 standards and works by Lorking 39 and Bobe et al 40 Prior to corrosion experiments all the samples were weighted using a microbalance Mettler Toledo XPE26 (Mettler Toledo, Columbus, OH, USA). After experiments, the corroded sample discs were removed from SBF and placed in a beaker containing an aqueous solution of CrO 3 at a concentration of ∼180.0 g/L.…”

Magnesium degradation under physiological conditions – Best practice

“…The degradation products developed on the surface are crucial to controlling the degradation kinetics. Chromic acid treatment (180 g/L in distilled water) facilitates the removal of the degradation layer providing an opportunity to visualise the degraded surface morphology [ 129 ]. In case of porosity and sub-surface cracks that appear in the layer, it is possible that Cl − aggregates might remain within the layer.…”